Limits are on the kinetic mixing parameter $\chi $ which is defined by the Lagrangian $\mathit L$ = $\text{-}{1\over 4}{{\mathit F}}_{{{\mathit \mu}} {{\mathit \nu}}}{{\mathit F}}{}^{{{\mathit \mu}} {{\mathit \nu}}}$ $−{1\over 4}{{\mathit F}}{}^{'}_{{{\mathit \mu}} {{\mathit \nu}}}{{\mathit F}}{}^{'{{\mathit \mu}} {{\mathit \nu}}}$ $\text{-}{\chi \over 2}{{\mathit F}}_{{{\mathit \mu}} {{\mathit \nu}}}{{\mathit F}}{}^{'{{\mathit \mu}} {{\mathit \nu}}}$ + ${{{\mathit m}}{}^{2}_{{{\mathit \gamma}^{\,'}}}\over 2}{{\mathit A}}{}^{'}_{{{\mathit \mu}}}{{\mathit A}}{}^{'{{\mathit \mu}}}$, where ${{\mathit A}_{{{\mu}}}}$ and ${{\mathit A}_{{{\mu}}}^{\,'}}$ are the photon and hidden-photon fields with field strengths ${{\mathit F}}_{{{\mathit \mu}} {{\mathit \nu}}}$ and ${{\mathit F}}{}^{'}_{{{\mathit \mu}} {{\mathit \nu}}}$, respectively, and is the hidden-photon mass.

VALUE CL% DOCUMENT ID TECN  COMMENT • • We do not use the following data for averages, fits, limits, etc. • • $<4 \times 10^{-6}$ 90 1 ABREU 2024 FASR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 50 MeV $<1 \times 10^{-3}$ 90 2 AAD 2023 BO ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $5 - 40$ GeV $<1.3 \times 10^{-8}$ 90 3 AAD 2023 I ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.017 - 15$ GeV 4 AAD 2023 T ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ 40 GeV $<1 \times 10^{-16}$ 90 5 AALBERS 2023 A LZ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 17$ keV $<1.6 \times 10^{-3}$ 90 6 ABLIKIM 2023 AF BES3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.5 - 2.9$ GeV 7 ABUDINEN 2023 B BEL2 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $4 - 9.7$ GeV $<1.61 \times 10^{-14}$ 90 8 ADHIKARI 2023 C100 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 215 eV $<6 \times 10^{-14}$ 90 9 ADHIKARI 2023 A C100 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10 - 1000$ keV $<2.1 \times 10^{-3}$ 95 10 ADRIAN 2023 HPS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $19 - 81$ MeV $<1.1 \times 10^{-16}$ 90 11 AGNES 2023 A DS50 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.03 - 20$ keV $<2 \times 10^{-12}$ 95 12 AN 2023 A ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $4.1 - 6.2$ $\mu $eV $<5 \times 10^{-6}$ 90 13 ANDREEV 2023 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-3} - 1.5$ GeV $<5.0 \times 10^{-14}$ 68 14 BAJJALI 2023 BRAS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $49.63 - 74.44$ $\mu $eV $<2 \times 10^{-7}$ 90 15 CORTINA-GIL 2023 C NA62 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10 - 700$ MeV $<2.2 \times 10^{-3}$ 90 16 HAYRAPETYAN 2023 G CMS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.1 - 7.9$ GeV $<3 \times 10^{-11}$ 95 17 KOTAKA 2023 DORR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $74 - 110$ $\mu $eV $<2 \times 10^{-15}$ 18 LI 2023 I ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-3} - 10^{5}$ eV $<7.9 \times 10^{-13}$ 95 19 RAMANATHAN 2023 QULP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $19.7 - 30.5$ $\mu $eV $<1.6 \times 10^{-9}$ 95 20 ROMANENKO 2023 LSW ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.21 - 5.7$ $\mu $eV 21 XIA 2023 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ $10^{-23}$eV 22 AAD 2022 J ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 60$ GeV 23 AAD 2022 S ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ 10 GeV $<2 \times 10^{-15}$ 90 24 APRILE 2022 XE1T ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.9 keV $<2 \times 10^{-15}$ 90 25 APRILE 2022 XE1T ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.01 - 0.4$ keV $<5 \times 10^{-17}$ 90 26 APRILE 2022 B XENT ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$= $1 - 39,44 - 140$ keV $<0.01$ 90 27 BATTAGLIERI 2022 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $3 - 100$ MeV ($4.6$ ${}^{+0.5}_{-0.4}$) $ \times 10^{-15}$ 68 28 BOLTON 2022 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = ($8.4$ $\pm0.6$) $ \times 10^{-14}$ eV $<1 \times 10^{-13}$ 90 29 CERVANTES 2022 ORPH ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $65.5 - 69.3$ $\mu $eV $<1 \times 10^{-12}$ 90 30 CHILES 2022 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.7 - 0.8$ eV $<8.7 \times 10^{-11}$ 95 31 HOCHBERG 2022 SNSP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.73 - 30$ eV 32 LEES 2022 BABR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 \times 10^{-3} - 3.16$ GeV $<7.97 \times 10^{-9}$ 95 33 LU 2022 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ $3 \times 10^{-5}$ eV $<6.86 \times 10^{-11}$ 90 34 MANENTI 2022 MDHI ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1.61 eV $<0.03$ 95 35 THOMAS 2022 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 80$ GeV 36 TUMASYAN 2022 AH CMS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $4 - 62.5$ GeV 37 TUMASYAN 2022 N CMS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.6 - 49$ GeV 38 WU 2022 A PPTA ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ $10^{-23}$eV $<8 \times 10^{-6}$ 90 39 ANDREEV 2021 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 \times 10^{-3} - 1$ GeV $<2.3 \times 10^{-4}$ 90 40 ANDREEV 2021 A NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.1 - 0.35$ GeV $<1.6 \times 10^{-4}$ 95 41 BI 2021 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.03 - 0.06$ eV $<3 \times 10^{-5}$ 90 42 CAZZANIGA 2021 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10 - 390$ MeV $<1.68 \times 10^{-15}$ 90 43 DIXIT 2021 CNTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 24.86 $\mu $eV $<2 \times 10^{-16}$ 90 44 GHOSH 2021 RVUE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $2 - 30$ $\mu $eV $<1.8 \times 10^{-13}$ 45 GODFREY 2021 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.2637 - 0.2648$ $\mu $eV $<3 \times 10^{-12}$ 95 46 KOPYLOV 2021 A CNTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $9 - 40$ eV $<0.02$ 95 47 KRIBS 2021 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ 10 GeV 48 SCHMIDT 2021 THEO ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 0.6 GeV $<3 \times 10^{-8}$ 90 49 TSAI 2021 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.78 GeV $<1 \times 10^{-4}$ 90 50 AAIJ 2020 C LHCB ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 214 MeV 51 AAIJ 2020 C LHCB ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $218 - 315$ MeV 52 ABLIKIM 2020 AB BES3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.2 - 2.1$ GeV $<4.1 \times 10^{-12}$ 90 53 AGOSTINI 2020 HPGE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 60 keV $-$ 1 MeV $<3.3 \times 10^{-14}$ 90 54 AMARAL 2020 SCDM ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.2 - 50$ eV $<1.2 \times 10^{-14}$ 90 55 AN 2020 XE1T ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 200 eV $<6.72 \times 10^{-13}$ 95 56 ANDRIANAVALOM.. 2020 FUNK ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.95 - 8.55$ eV $<1 \times 10^{-16}$ 90 57 APRILE 2020 XE1T ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 200$ keV $<9 \times 10^{-16}$ 90 58 ARALIS 2020 SCDM ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.04 - 500$ keV $<3 \times 10^{-5}$ 90 59 ARGUELLES 2020 THEO ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.01 GeV $<7 \times 10^{-14}$ 90 60 ARNAUD 2020 EDEL ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 40$ eV $<8.2 \times 10^{-5}$ 90 61 BANERJEE 2020 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.5 - 24$ MeV $<7 \times 10^{-15}$ 90 62 BARAK 2020 SENS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.2 - 12.8$ eV 63 KRASNIKOV 2020 RVUE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 16.7 MeV $<1.4 \times 10^{-14}$ 90 64 SHE 2020 CDEX ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10 - 300$ eV $<1.3 \times 10^{-15}$ 90 65 SHE 2020 CDEX ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.1 - 4$ keV $<1 \times 10^{-3}$ 90 66 SIRUNYAN 2020 AQ CMS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $11.5 - 75$ GeV, $110 - 200$ GeV $<4.3 \times 10^{-10}$ 95 67 TOMITA 2020 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $115.79 - 115.85$ $\mu $eV $<9 \times 10^{-16}$ 90 68 WANG 2020 A CDEX ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.185 - 10$ keV 69 AABOUD 2019 G ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $20 - 60$ GeV $<6 \times 10^{-3}$ 90 70 ABLIKIM 2019 A BES3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.01 - 2.4$ GeV $<3.4 \times 10^{-3}$ 90 71 ABLIKIM 2019 H BES3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.1 - 2.1$ GeV $<8 \times 10^{-15}$ 90 72 AGUILAR-AREVA.. 2019 A DAMC ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.2 - 30$ eV $<9 \times 10^{-17}$ 90 73 APRILE 2019 D XE1T ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.186 - 5$ keV $<7.5 \times 10^{-6}$ 90 74 BANERJEE 2019 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 200$ MeV $<2 \times 10^{-11}$ 75 BHOONAH 2019 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-22} - 10^{-10}$ eV $<5 \times 10^{-12}$ 95 76 BRUN 2019 SHUK ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $20.8 - 28.3$ $\mu $eV $<4.4 \times 10^{-4}$ 90 77 CORTINA-GIL 2019 NA62 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $60 - 110$ MeV $<3 \times 10^{-5}$ 95 78 DANILOV 2019 TEXO ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 20 eV - 1 MeV $<6 \times 10^{-9}$ 95 79 HOCHBERG 2019 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.8 - 4$ eV $<1 \times 10^{-11}$ 95 80 KOPYLOV 2019 CNTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $9 - 40$ eV $<1.5 \times 10^{-9}$ 81 KOVETZ 2019 COSM ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-23} - 10^{-13}$ eV $<3 \times 10^{-14}$ 95 82 NGUYEN 2019 WDMX ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 6 neV $-$ 2.07 $\mu $eV $<4.5 \times 10^{-14}$ 90 83 ABE 2018 F XMAS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $40 - 120$ keV $<2.5 \times 10^{-3}$ 95 84 ADRIAN 2018 HPS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $19 - 81$ MeV $<4.4 \times 10^{-4}$ 90 85 ANASTASI 2018 B KLOE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $519 - 987$ MeV $<4 \times 10^{-15}$ 90 86 ARMENGAUD 2018 EDE3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.8 - 500$ keV 87 BANERJEE 2018 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 23$ MeV $<1.8 \times 10^{-5}$ 90 88 BANERJEE 2018 A NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 100$ MeV $<1 \times 10^{-8}$ 90 89 KNIRCK 2018 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.67 - 0.92$ meV $<3.1 \times 10^{-14}$ 90 90 ABGRALL 2017 HPGE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 11.8 keV $<6 \times 10^{-4}$ 90 91 ABLIKIM 2017 AA BES3 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.5 - 3.4$ GeV $<7 \times 10^{-15}$ 90 92 ANGLOHER 2017 CRES ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.3 - 0.7$ keV $<1.2 \times 10^{-4}$ 90 93 BANERJEE 2017 NA64 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.002 - 0.4$ GeV $<2 \times 10^{-11}$ 94 CHANG 2017 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 15 MeV $<4.5 \times 10^{-3}$ 90 95 DUBININA 2017 EMUL ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.1 - 24$ MeV $<4 \times 10^{-4}$ 90 96 LEES 2017 E BABR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 4.7 GeV 97 AAD 2016 AG ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.1 - 2$ GeV $<4.4 \times 10^{-4}$ 90 98 ANASTASI 2016 KLOE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $527 - 987$ MeV $<1.7 \times 10^{-6}$ 95 99 KHACHATRYAN 2016 CMS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2 GeV $<0.04$ 95 100 AAD 2015 CD ATLS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $15 - 55$ GeV $<1.4 \times 10^{-3}$ 90 101 ADARE 2015 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $30 - 90$ MeV 102 AN 2015 A ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 12 eV - 40 keV 103 ANASTASI 2015 KLOE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2${\mathit m}_{{{\mathit \mu}}}$ - 1 GeV $<1.7 \times 10^{-3}$ 90 104 ANASTASI 2015 A KLOE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $5 - 320$ MeV $<4.2 \times 10^{-4}$ 90 105 BATLEY 2015 A NA48 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 36 MeV 106 JAEGLE 2015 BELL ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.1 - 3.5$ GeV $<3 \times 10^{-13}$ 107 KAZANAS 2015 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2${\mathit m}_{{{\mathit e}}}$ $-$ 100 MeV $<6 \times 10^{-12}$ 108 SUZUKI 2015 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.9 - 4.3$ eV $<2.3 \times 10^{-13}$ 99.7 109 VINYOLES 2015 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 8 eV $<2 \times 10^{-13}$ 110 ABE 2014 F XMAS ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $40 - 120$ keV $<1.8 \times 10^{-3}$ 90 111 AGAKISHIEV 2014 HDES ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 63 MeV $<9.0 \times 10^{-4}$ 90 112 BABUSCI 2014 KLOE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 969 MeV 113 BATELL 2014 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-3} - 1$ GeV $<1.3 \times 10^{-7}$ 95 114 BLUEMLEIN 2014 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.6 GeV $<3 \times 10^{-18}$ 115 FRADETTE 2014 COSM ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $50 - 300$ MeV $<3.5 \times 10^{-4}$ 90 116 LEES 2014 J BABR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.2 GeV $<9 \times 10^{-4}$ 95 117 MERKEL 2014 A1 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $40 - 300$ MeV $<3 \times 10^{-15}$ 118 AN 2013 B ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2 keV $<7 \times 10^{-14}$ 119 AN 2013 C XE10 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 100 eV $<8 \times 10^{-4}$ 120 DIAMOND 2013 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $30 - 250$ MeV $<2 \times 10^{-3}$ 90 121 GNINENKO 2013 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $25 - 120$ MeV $<2.2 \times 10^{-13}$ 122 HORVAT 2013 HPGE ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 230 eV $<8.06 \times 10^{-5}$ 95 123 INADA 2013 LSW ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.04 eV$−$26 keV $<2 \times 10^{-10}$ 95 124 MIZUMOTO 2013 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 eV $<1.7 \times 10^{-7}$ 125 PARKER 2013 LSW ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 53 $\mu $eV $<5.32 \times 10^{-15}$ 126 PARKER 2013 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 53 $\mu $eV $<1 \times 10^{-15}$ 127 REDONDO 2013 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2 keV $<8 \times 10^{-8}$ 90 128 GNINENKO 2012 A BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 135$ MeV $<1 \times 10^{-7}$ 90 129 GNINENKO 2012 B CHRM ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 500$ MeV $<1 \times 10^{-3}$ 90 130 ABRAHAMYAN 2011 ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $175 - 250$ MeV $<9 \times 10^{-8}$ 95 131 BLUEMLEIN 2011 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 70 MeV $<1 \times 10^{-7}$ 132 BJORKEN 2009 BDMP ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $2 - 400$ MeV $<5 \times 10^{-9}$ 133 BJORKEN 2009 ASTR ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $2 - 50$ MeV 1  ABREU 2024 look for hidden photons produced from the ${{\mathit p}}{{\mathit p}}$ collision in the decay channel ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$, and exclude at 90$\%$ CL the region of $\chi $ = $4 \times 10^{-6} - 2 \times 10^{-4}$ and ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10 - 80$ MeV, with the newly excluded region near the higher values of $\chi $. See their Fig. 7 for mass-dependent limits. 2  AAD 2023BO look for rare decays of the ${{\mathit Z}}$ boson, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{+}$ ${{\mathit H}^{\,'}}$, with dark Higgs decaying into a pair of hidden photons, assuming that at least two of the hidden photons decay into ${{\mathit e}^{+}}{{\mathit e}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$. The quoted limit assumes the hidden fine structure constant ${{\mathit \alpha}_{{{D}}}}$ = 0.1 and the dark Higgs mass ranging 20 to 70 GeV. See their Fig.5 for the mass-dependent limits. 3  AAD 2023I look for exotic decays of the SM-like Higgs boson, ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$ with hidden photons decaying into displaced lepton or light quark pairs, and set limits on the kinetic mixing within $1 \times 10^{-4} - 1 \times 10^{-8}$ for the given mass range. The quoted limit is for ${\mathit m}_{{{\mathit A}^{0}}}$ $\simeq{}$ 13 GeV with a branching fraction of 0.1 for the Higgs decaying into hidden photon pairs. See their Fig. 13 for the mass-dependent limits. 4  AAD 2023T is analogous to AAD 2022S, but using the ${{\mathit Z}}{{\mathit H}}$ production mode, and set the upper limit on the branching ratio B( ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$) within $0.0219 - 0.0252$ (95$\%$ CL). 5  AALBERS 2023A look for an absorption of hidden photon dark matter. The quoted limit is for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1.4 keV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 7 for mass-dependent limits. 6  ABLIKIM 2023AF look for invisible decays of hidden photons produced in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$. They set limits within the $1.6 \times 10^{-3} - 5.7 \times 10^{-3}$. See their Fig. 3 for mass-dependent limits. 7  ABUDINEN 2023B look for hidden photons in the dark Higgsstrahlung process, ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit H}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$) with ${{\mathit H}^{\,'}}$ being invisible. They set upper limits on the product of the kinetic mixing and the hidden gauge coupling, ${{\mathit \chi}^{2}}\cdot{}{{\mathit \alpha}_{{{D}}}}$, in the range of $1.7 \times 10^{-8} - 2 \times 10^{-6}$ at 90$\%$ CL for a 1 GeV dark Higgs mass. See their Fig. 3 for the mass-dependent limits. 8  ADHIKARI 2023 look for the annual modulation signal induced by solar flux of hidden photons. See their Fig. 10 for mass-dependent limits. 9  ADHIKARI 2023A look for absorption and Compton-like processes of hidden photon dark matter. The quoted limit is for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 12 keV. Limits between $6 \times 10^{-14} - 3 \times 10^{-11}$ are obtained. See their Fig. 4 for mass-dependent limits. 10  ADRIAN 2023 is an update of ADRIAN 2018, and use the data from the 2016 engineering run at 2.3 GeV. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 74 MeV. See their Fig. 28 for the mass-dependent limits. 11  AGNES 2023A look for an absorption of hidden photon dark matter. The quoted limit is for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.03 keV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 2 for mass-dependent limits. 12  AN 2023A look for absorption of hidden photon dark matter at radio telescopes, setting limits based on data from the FAST telescope. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 1 for mass-dependent limits. 13  ANDREEV 2023 is an update of ANDREEV 2021 and ANDREEV 2021A. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 MeV. See their Fig. 3 for mass-dependent limits. 14  BAJJALI 2023 look for hidden photon dark matter by using a $12 - 18$ GHz dish antenna at U. Hamburg that is sensitive to vertically aligned hidden photon polarizations. They assume a local density of $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$. See their Figure 12 for mass-dependent limits in the range of ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $50 - 75$ $\mu eV$ under the assumption of randomly aligned hidden photon polarizations, defined as "1 sigma sensitivity". The run is labelled BRASS-p. 15  CORTINA-GIL 2023C NA62 beam dump experiment searches for hidden photons decaying to ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$, extending their previous search CORTINA-GIL 2019. The quoted limit applies at 300 MeV but does not extend to arbitrarily large kinetic mixing parameters. See Fig. 4 for mass-dependent limits. 16  HAYRAPETYAN 2023G search for kinetically mixed hidden photons in proton-proton collisions at the LHC that would generate a narrow peak in the mass spectrum of dimuon events. The mass window between 2.6 and 4.2 GeV is left unconstrained to avoid ${{\mathit J / \psi}}$ and ${{\mathit \psi}{(2S)}}$ resonances. Mass dependent limits given in their Fig. 6. 17  KOTAKA 2023 is an update of TOMITA 2020, and set limits $\chi $ $<$ $0.3 - 2 \times 10^{-10}$ for the quoted mass range. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.39 GeV/cm${}^{3}$ is assumed. See their Fig. 5 for mass-dependent limits. 18  LI 2023I set cooling bounds on the emission of hidden photons from the Sun, red giant, and horizontal branch stars, including emission of both the transverse and longitudinal modes. Cooling bounds are computed assuming a static model as opposed to considering the impact on stellar evolution. The result is comparable to earlier estimates of the same bound e.g. REDONDO 2013. Limit applies at the most constraining mass around 200 eV for the solar bound. 19  RAMANATHAN 2023 look for hidden photon dark matter using a gold-plated copper dish antenna cooled to 20 mK. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.45 GeV/cm${}^{3}$ is assumed. Limits between $7.9 \times 10^{-13}$ and $3.81 \times 10^{-12}$ are obtained. See their Fig. 5 for mass-dependent limits. 20  ROMANENKO 2023 employed two superconducting radio frequency cavities with a high quality factor, optimized for detecting the longitudinal polarization of the hidden photon. The quoted limit is set at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ $5\mu $eV. See their Fig. 4 for the mass-dependent limits. 21  XIA 2023 is analogous to WU 2022A and use the Fermi-LAT pulsar timing array. They set a bound on the local density as $\rho _{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ 7 GeV/cm${}^{3}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ ${ {}\lesssim{} }$ $10^{-23}$ eV at 95$\%$ CL, with weaker constraints up to $10^{-22}$ eV. See their Fig. 1 for the mass-dependent limits. 22  AAD 2022J look for exotic decays of the SM-like Higgs boson, ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ and ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}^{\,'}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, and set limits on the kinetic mixing and the Higgs portal coupling. See their Figs. 19 and 20 for the mass-dependent limits. 23  AAD 2022S look for decays of a Higgs boson into ${{\mathit \gamma}}$ and ${{\mathit \gamma}^{\,'}}$ using the VBF production mode, and set the upper limit on the branching ratio at 0.018 (95$\%$ CL) for the 125 GeV Higgs boson. For the quoted mass range, the signal acceptance changes by less than 1$\%$. 24  APRILE 2022 is analogous to AN 2020, and set limits $\chi $ $<$ $3 \times 10^{-13}$ (eV/${\mathit m}_{{{\mathit \gamma}^{\,'}}}$) for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 3 eV (90$\%$ C.L.). For ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $>$ 3 eV, see their Fig. 16 for mass-dependent limits. 25  APRILE 2022 extend APRILE 2019 to lower masses by removing the background of ionization signals correlated with high-energy events. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.09 keV. See their Fig. 15 for mass-dependent limits. 26  APRILE 2022B is an update of APRILE 2020, and set limits $\chi $ ${ {}\lesssim{} }$ $5 \times 10^{-17} - 2 \times 10^{-13}$. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 keV. They exclude the XENON1T excess found in APRILE 2020. See their Fig. 6 for mass-dependent limits. 27  BATTAGLIERI 2022 is analogous to BATELL 2014, and derived limits from the electron beam dump experiment at Jefferson Lab (BDX-MINI). Limits at the level of $7 \times 10^{-5} - 1 \times 10^{-2}$ are obtained for the dark matter mass ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$/3 and the hidden gauge coupling $\alpha _{D}$ = 0.1. See their Fig. 11. 28  BOLTON 2022 use the Ly-$\alpha $ forest at z $\simeq{}$ 0.1 as a calorimeter for heating in the intergalactic medium by the resonant conversion of hidden photon dark matter to photons, which is assumed to be responsible for the tension between the predicted and observed Ly-$\alpha $ absorption linewidths. 29  CERVANTES 2022 use a dielectrically loaded Fabry-Perot open cavity to look for hidden photon dark matter. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.45 GeV/cm${}^{3}$ is assumed. See their Fig. 5 for mass-dependent limits. 30  CHILES 2022 look for hidden photon dark matter by using a layered dielectric target and a superconducting nanowire single-photon detector. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.4 GeV/cm${}^{3}$ is assumed. See their Fig. 4 for mass-dependent limits. 31  HOCHBERG 2022 update HOCHBERG 2019. The quoted limit applies to ${\mathit m}_{{{\mathit A}^{0}}}$ $\simeq{}$ 11 eV. See their Fig. 5 for mass-dependent limits. 32  LEES 2022 look for a hidden fermion-fermion bound state decaying into three hidden photons, which subsequently decay into ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$, or ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$. For the bound-state mass in the range of $0.05 - 9.5$ GeV, limits at the level of $5 \times 10^{-5} - 1 \times 10^{-3}$ are obtained. See their Fig. 6 for mass-dependent limits. 33  LU 2022 derive the limit by studying the effect of photons oscillating into hidden photons on the surface luminosity of the neutron star RX J1856.6-3754. 34  MANENTI 2022 look for hidden photon dark matter by using a multilayer dielectric haloscope. Limits between $6.86 \times 10^{-11}$ and $5 \times 10^{-8}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ $1.1 - 3.1$ eV. See their Fig. 11 for mass-dependent limits. 35  THOMAS 2022 improved KRIBS 2021 by taking account of the changes in the parton distribution functions due to the inclusion of hidden photons. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 4 GeV. Limits in the range of $3 \times 10^{-2} - 9 \times 10^{-2}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 80$ GeV. See their Fig. 1 for the limits. 36  TUMASYAN 2022AH look for exotic decays of the SM-like Higgs boson, ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}^{\,'}}$ $\rightarrow$ 4 ${{\mathit \ell}}$, and set limits on the Higgs portal coupling. See their Fig. 6 for the limits. 37  TUMASYAN 2022N look for exotic decays of the SM-like Higgs boson, ${{\mathit H}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$), and set limits on the branching fraction product. See their Fig. 7 for mass- and lifetime-dependent limits. 38  WU 2022A look for direction-dependent oscillations in the gravitational potential generated by ultralight hidden photon dark matter, and set a bound on its local density as $\rho _{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ 5 GeV/cm${}^{3}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{ {}\lesssim{} }$ $10^{-23}$ eV at 95$\%$ CL. 39  ANDREEV 2021 is analogous to BANERJEE 2018A. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 MeV. See their Fig. 3 for mass-dependent limits. 40  ANDREEV 2021A extends the limits of BANERJEE 2019 by taking account of production through the resonant annihilation of secondary positrons with atomic electrons. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.23 GeV, assuming the fermion dark matter of mass ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$/3 and the hidden gauge coupling $\alpha _{D}$ = 0.1. See their Fig.3 for mass-dependent limits. 41  BI 2021 look for the gamma-ray spectral attenuation due to scattering with hidden photons constituting all dark matter, using the measurements of sub-PeV gamma-rays from the Crab Nebula by the Tibet AS${{\mathit \gamma}}$ and HAWC experiments, together with MAGIC and HEGRA gamma-ray data. See their Fig. 4 for mass-dependent limits. 42  CAZZANIGA 2021 look for semi-visible decays of hidden photons, ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \chi}_{{{1}}}}{{\mathit \chi}_{{{2}}}}$ ( ${{\mathit \chi}_{{{2}}}}$ $\rightarrow$ ${{\mathit \chi}_{{{1}}}}{{\mathit e}^{+}}{{\mathit e}^{-}}$), where ${{\mathit \chi}_{{{1}}}}$ and ${{\mathit \chi}_{{{2}}}}$ are hidden fermions. They exclude $3 \times 10^{-5}{ {}\lesssim{} }$ $\chi $ ${ {}\lesssim{} }$ $2 \times 10^{-2}$ assuming the hidden gauge coupling ${{\mathit \alpha}_{{{D}}}}$ = 0.1, and the fermion masses ${\mathit m}_{{{\mathit \chi}_{{{1}}}}}$ = ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$/3, (${\mathit m}_{{{\mathit \chi}_{{{2}}}}}$ $−$ ${\mathit m}_{{{\mathit \chi}_{{{1}}}}})/{\mathit m}_{{{\mathit \chi}_{{{1}}}}}$ = 0.4. See their Fig. 4 for mass-dependent limits. 43  DIXIT 2021 look for hidden photon dark matter by using a superconducting transmon qubit dispersively coupled to a high $\mathit Q$ storage cavity. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.4 GeV/cm${}^{3}$ is assumed. See their Fig.4 for mass-dependent limits. 44  GHOSH 2021 use existing haloscope axion search limits to set limits on hidden photon dark matter, considering the polarization of hidden photons. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 3 $\mu $eV. See their Fig. 1 for mass-dependent limits. 45  GODFREY 2021 look for hidden photon dark matter by using a wideband antenna, and set 5$\sigma $ limits on $\chi $. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.38 GeV/cm${}^{3}$ is assumed. See their updated Fig. 12 in arXiv:2101.02805v4 for mass-dependent limits in the range of ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.207 - 1.24$ $\mu $eV. 46  KOPYLOV 2021A is an update of KOPYLOV 2019, but use ${}^{}\mathrm {Ne}$ gas instead of ${}^{}\mathrm {Ar}$. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 12 eV. See their Fig. 4 for mass-dependent limits. 47  KRIBS 2021 used the HERA data on neutral current deep inelastic ${{\mathit e}}{{\mathit p}}$ scattering to derive the limits, which become weaker for heavier masses. See their Fig. 3 for mass-dependent limits. 48  SCHMIDT 2021 use the microscopic Parton-Hadron-String Dynamics approach to extract limits by comparing the theoretically calculated dilepton spectra with the HADES data on the search for ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$. See their Fig. 5 for the mass-dependent limits for various allowed surplus of the hidden photon contribution over the standard model yield. 49  TSAI 2021 update the limits from the CHARM and NuCal experiments, taking account of additional production channels from proton bremsstrahlung and ${{\mathit \eta}}$ meson decays, respectively. Limits between $3 \times 10^{-8}$ and $1 \times 10^{-4}$ are obtained for 0.01 $<$ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 0.8 GeV (see their Fig. 1). 50  AAIJ 2020C look for hidden photons produced from the ${{\mathit p}}{{\mathit p}}$ collision in the decay channel ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$. For prompt decaying hidden photons, limits at the level of $10^{-4} - 10^{-3}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.214 - 30$ GeV. See their Fig. 2 for mass-dependent limits. 51  AAIJ 2020C look for hidden photons produced from the ${{\mathit p}}{{\mathit p}}$ collision in the decay channel ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$. For hidden photons with lifetimes of order ps, limits at the level of $10^{-5}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $218 - 315$ MeV. See their Fig. 4 for mass-dependent limits. 52  ABLIKIM 2020AB search for ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}$), and set the upper limit on the product branching fraction of order $10^{-7}$. See their Fig. 7 for mass-dependent limits. 53  AGOSTINI 2020 is analogous to ABE 2014F. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 150 keV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. Their limits in their Fig. 3 were later found to be incorrect due to an error of their Eqs. (1) and (2). See Fig. 3 in AGOSTINI 2022A for the corrected limits. 54  AMARAL 2020 use a second-generation SuperCDMS high-voltage eV-resolution detector to set limits on dark-matter hidden photon absorption. The quoted limit is for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 17 eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 3 for mass-dependent limits. 55  AN 2020 updates the direct detection limit of AN 2013C on solar flux of hidden photons; $\chi $ $<$ $1.6 \times 10^{-12}$ (eV/${\mathit m}_{{{\mathit \gamma}^{\,'}}}$) for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 6 eV (90$\%$ C.L.). For ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $>$ 6 eV, see their Fig. 1 for mass-dependent limits. 56  ANDRIANAVALOMAHEFA 2020 is analogous to SUZUKI 2015, but uses a mirror that is about one order of magnitude larger than in similar studies in the past. Limits at the level of $10^{-12}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $2.5 - 7$ eV. See their Fig.23 and Table III for mass-dependent limits. 57  APRILE 2020 is analogous to ABE 2014F, and set limits $\chi $ ${ {}\lesssim{} }$ $10^{-16} - 10^{-12}$. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 keV. They also found an excess over known backgrounds, which favors the mass ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $2.3$ $\pm0.2$ keV with a 3 $\sigma $ significance. See their Fig. 10 for mass-dependent limits. 58  ARALIS 2020 is analogous to ABE 2014F. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.1 keV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. The limits at masses above 3 keV in their Fig. 10 was later found to be incorrect due to an error in their analysis. See Fig. 3 in ARALIS 2021 for the corrected limits. 59  ARGUELLES 2020 examine hidden-photon production in atmospheric cosmic-ray showers and its decay in IceCube and Super-Kamiokande. The quoted limit assumes a lifetime of $\mathit c\tau $ = 0.1 km. See their Fig. 16 for mass- and lifetime-dependent limits. 60  ARNAUD 2020 look for the absorption signal of hidden photon dark matter in a ${}^{}\mathrm {Ge}$ detector. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 9 eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 3 for mass-dependent limits. 61  BANERJEE 2020 is an update of BANERJEE 2018. They exclude $8.2 \times 10^{-5}{ {}\lesssim{} }$ $\chi $ ${ {}\lesssim{} }$ $1 \times 10^{-2}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.5 - 24$ MeV. In particular, they exclude $\chi $ = $1.2 \times 10^{-4} - 6.8 \times 10^{-4}$ for the 16.7 MeV gauge boson. See their Fig. 5 for mass-dependent limits. 62  BARAK 2020 is analogous to AGUILAR-AREVALO 2019A, and look for hidden photon dark matter by using the Skipper CCD. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 12.8 eV. See their Fig. 4 for mass-dependent limits. 63  KRASNIKOV 2020 showed that the limit of BANERJEE 2020 combined with the measured anomalous magnetic moment of the electron exclude the 16.7 MeV gauge boson suggested by the ATOMKI (KRASZNAHORKAY 2016) experiment if it has pure vector or axial-vector interactions. 64  SHE 2020 look for solar hidden photons. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 180 eV. See their Fig. 4 for mass-dependent limits. 65  SHE 2020 look for hidden photon dark matter and set limits $\chi $ $<$ $1.3 \times 10^{-15} - 2.8 \times 10^{-14}$ for the quoted mass range. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 6 for mass-dependent limits. 66  SIRUNYAN 2020AQ look for a narrow resonance decaying into a pair of muons. For ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 45 GeV, they use dedicated high-rate dimuon triggers to reduce the muon transverse momentum thresholds. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 50 GeV, and limits of order $10^{-3}$ are obtained for the quoted mass range. See their Fig. 3 for mass-dependent limits. 67  TOMITA 2020 look for hidden photon dark matter using a planar metal plate and cryogenic receiver and set limits $\chi $ $<$ $1.8 - 4.3 \times 10^{-10}$ for the quoted mass range. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.39 GeV/cm${}^{3}$ is assumed. See their Fig. 7 for mass-dependent limits. 68  WANG 2020A is analogous to ABE 2014F. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 185 eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 11 for mass-dependent limits. 69  AABOUD 2019G look for ${{\mathit h}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$) and exclude a kinetic mixing around $10^{-9} - 10^{-8}$ for B( ${{\mathit h}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$) = 0.01 and 0.1. See their Fig. 9 for mass-dependent limits. 70  ABLIKIM 2019A look for ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \eta}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$). Limits between $6 \times 10^{-3}$ and $5 \times 10^{-2}$ are obtained (see their Fig. 8). 71  ABLIKIM 2019H look for ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \eta}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$). Limits between $3.4 \times 10^{-3}$ and $2.6 \times 10^{-2}$ are obtained. See their Fig. 5 for mass-dependent limits. 72  AGUILAR-AREVALO 2019A look for the absorption signal of hidden photon dark matter by using a CCD. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 17 eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 4 for mass-dependent limits. 73  APRILE 2019D is analogous to ABE 2014F. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.7 keV. See their Fig. 5(f) for mass-dependent limits. 74  BANERJEE 2019 is an update of BANERJEE 2018A. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 MeV. See their Fig. 3 for mass-dependent limits. 75  BHOONAH 2019 examine heating of Galactic Center gas clouds by hidden photon dark matter. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ $10^{-12}$ eV. See their Fig. 2 for mass-dependent limits. 76  BRUN 2019 is analogous to SUZUKI 2015. The limit is derived under an assumption that hidden photons constitute the local dark matter density $\rho _{\gamma '}$ = 0.3 GeV/cm${}^{3}$. 77  CORTINA-GIL 2019 look for an invisible hidden photon in the reaction ${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{0}}$ ( ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}$ ${{\mathit \gamma}^{\,'}}$). The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $62.5 - 65$ MeV. See their Figs. 6 and 7 for mass-dependent limits. 78  DANILOV 2019 examined the hidden photon production in nuclear reactors, correctly taking account of the effective photon mass in the reactor and detector. The limit gets weaker for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ less than the effective photon mass in proportion to 1/${{\mathit m}^{2}}_{{{\mathit \gamma}^{\,'}}}$. See their Fig. 1 for mass-dependent limits. 79  HOCHBERG 2019 look for the absorption signal of hidden photon dark matter by using superconducting-nanowire single-photon detectors. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 1 eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 4 for mass-dependent limits. 80  KOPYLOV 2019 look for hidden-photon dark matter using a counter with an aluminum cathode and derive limits assuming it constitute all the local dark matter. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 12 eV. See their Fig. 7 for mass-dependent limits. 81  KOVETZ 2019 examine heating of the early Universe plasma by hidden photon dark matter, and derive the limits by requiring that the cosmic mean 21 cm brightness temperature relative to the CMB temperature satisfy T$_{21}$ $>$ $-100$ mK. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ $2 \times 10^{-14}$ eV. See their Fig. 3 for mass-dependent limits. 82  NGUYEN 2019 look for hidden photon dark matter with a resonant cavity, and set limits $\sim{}10^{-12}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.2 - 2.07\mu $eV. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1.3 $\mu $eV. The local density $\rho _{{{\mathit \gamma}^{\,'}}}$ = 0.3 GeV/cm${}^{3}$ is assumed. See their Fig. 19 for mass-dependent limits. 83  ABE 2018F is an update of ABE 2014F. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ 40 keV. See their Fig. 5 for mass-dependent limits. 84  ADRIAN 2018 look for a hidden photon resonance in the reaction ${{\mathit e}^{-}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{-}}{{\mathit Z}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$). The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 40 MeV. See their Fig. 4 for mass-dependent limits. 85  ANASTASI 2018B look for a hidden photon resonance in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$). The quoted limit is obtained by combining the result of ANASTASI 2016 and it applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $\simeq{}$ $519 - 987$ MeV. See their Fig. 9 for mass-dependent limits. 86  ARMENGAUD 2018 is analogous to ABE 2014F. The quoted limits applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1.6 keV. See the right panel of Fig. 5 for mass-dependent limits. 87  BANERJEE 2018 look for hidden photons produced in the reaction ${{\mathit e}^{-}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{-}}{{\mathit Z}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$), and exclude $9.2 \times 10^{-5}{ {}\lesssim{} }$ $\chi $ ${ {}\lesssim{} }$ $1 \times 10^{-2}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1 - 23$ MeV. They also set a limit on the electron coupling to a 16.7 MeV gauge boson suggested by the ATOMKI (KRASZNAHORKAY 2016) experiment. See their Fig. 3 for mass-dependent limits. 88  BANERJEE 2018A look for invisible decays of hidden photons produced in the reaction ${{\mathit e}^{-}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{-}}{{\mathit Z}}{{\mathit \gamma}^{\,'}}$ . The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1 MeV. See their Fig. 15 for mass-dependent limits. 89  KNIRCK 2018 is analogous to SUZUKI 2015. See their Fig. 5 for mass-dependent limits. 90  ABGRALL 2017 is analogous to ABE 2014F using the MAJORANA DEMONSTRATOR. See their Fig. 3 for limits between 6 keV $<$ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 97 keV. 91  ABLIKIM 2017AA look for ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$) . Limits between $10^{-3}$ and $10^{-4}$ are obtained (see their Fig. 3). 92  ANGLOHER 2017 is analogous to ABE 2014F. The quoted limit is at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 0.7 keV. See their Fig. 8 for mass-dependent limits. 93  BANERJEE 2017 look for invisible decays of hidden photons produced in the reaction ${{\mathit e}^{-}}$ ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}^{-}}{{\mathit Z}}{{\mathit \gamma}^{\,'}}$. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 2 MeV. See their Fig. 3 for mass-dependent limits. 94  CHANG 2017 examine the hidden photon emission from SN1987A, including the effects of finite temperature and density on $\chi $ and obtain limits $\chi $ (${\mathit m}_{{{\mathit \gamma}^{\,'}}}$/MeV) ${ {}\lesssim{} }$ $3 \times 10^{-9}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 15 MeV and $\chi $ ${ {}\lesssim{} }$ $10^{-9}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $15 - 120$ MeV. 95  DUBININA 2017 look for ${{\mathit \mu}^{+}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\overline{\mathit \nu}}_{{{\mu}}}}{{\mathit \nu}_{{{e}}}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$) in a nuclear photoemulsion. The quoted limit applies to ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 1.1 MeV. Limits between $4.5 \times 10^{-3}$ and $10^{-2}$ are obtained (see their Fig. 3). 96  LEES 2017E look for invisible decays of hidden photons produced in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$. See their Fig. 5 for limits in the mass range ${\mathit m}_{{{\mathit \gamma}^{\,'}}}{}\leq{}$ 8 GeV. 97  AAD 2016AG look for hidden photons promptly decaying into collimated electrons and/or muons, assuming that they are produced in the cascade decays of squarks or the Higgs boson. See their Fig. 10 and Fig.13 for their limits on the cross section times branching fractions. 98  ANASTASI 2016 look for the decay ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \pi}^{+}}$ ${{\mathit \pi}^{-}}$ in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$. Limits between $4.3 \times 10^{-3}$ and $4.4 \times 10^{-4}$ are obtained for 527 $<$ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 987 MeV (see their Fig. 9). 99  KHACHATRYAN 2016 look for ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ in a dark SUSY scenario where the SM-like Higgs boson decays into a pair of the visible lightest neutralinos with mass 10 GeV, both of which decay into ${{\mathit \gamma}^{\,'}}$ and a hidden neutralino with mass 1 GeV. See the right panel in their Fig. 2. 100  AAD 2015CD look for ${{\mathit H}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit \gamma}^{\,'}}$ $\rightarrow$ 4 ${{\mathit \ell}}$ with the ATLAS detector at LHC and find $\chi $ $<$ $4 - 17 \times 10^{-2}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $15 - 55$ GeV. See their Fig. 6. 101  ADARE 2015 look for a hidden photon in ${{\mathit \pi}^{0}}$, ${{\mathit \eta}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ at the PHENIX experiment. See their Fig. 4 for mass-dependent limits. 102  AN 2015A derived limits from the absence of ionization signals in the XENON10 and XENON100 experiments, assuming hidden photons constitute all the local dark matter. Their best limit is $\chi $ $<$ $1.3 \times 10^{-15}$ at ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = 18 eV. See their Fig. 1 for mass-dependent limits. 103  ANASTASI 2015 look for a production of a hidden photon and a hidden Higgs boson with the KLOE detector at DA$\Phi $NE, where the hidden photon decays into a pair of muons and the hidden Higgs boson lighter than ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ escape detection. See their Figs. 6 and 7 for mass-dependent limits on a product of the hidden fine structure constant and the kinetic mixing. 104  ANASTASI 2015A look for the decay ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$. Limits between $1.7 \times 10^{-3}$ and $1 \times 10^{-2}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $5 - 320$ MeV (see their Fig. 7). 105  BATLEY 2015A look for ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$) at the NA48/2 experiment. Limits between $4.2 \times 10^{-4}$ and $8.8 \times 10^{-3}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $9 - 120$ MeV (see their Fig. 4). 106  JAEGLE 2015 look for the decay ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$, or ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ in the dark Higgstrahlung channel, ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit H}^{\,'}}$ ( ${{\mathit H}^{\,'}}$ $\rightarrow$ ${{\mathit \gamma}^{\,'}}{{\mathit \gamma}^{\,'}}$) at the BELLE experiment. They set limits on a product of the branching fraction and the Born cross section as well as a product of the hidden fine structure constant and the kinetic mixing. See their Figs. 3 and 4. 107  KAZANAS 2015 set limits by studying the decay of hidden photons ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ inside and near the progenitor star of SN1987A. See their Fig. 6 for mass-dependent limits. 108  SUZUKI 2015 looked for hidden-photon dark matter with a dish antenna and derived limits assuming they constitute all the local dark matter. Their limits are $\chi $ $<$ $6 \times 10^{-12}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $1.9 - 4.3$ eV. See their Fig. 7 for mass-dependent limits. 109  VINYOLES 2015 performed a global fit analysis based on helioseismology and solar neutrino observations, and set the limits $\chi {\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ $1.8 \times 10^{-12}$ eV for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $3 \times 10^{-5} - 8$ eV. See their Fig. 11. 110  ABE 2014F look for the photoelectric-like interaction in the XMASS detector assuming the hidden photon constitutes all the local dark matter. Limits between $2 \times 10^{-13}$ and $1 \times 10^{-12}$ are obtained, where the relation $\chi {}^{2}$ = $\alpha $'/$\alpha $ is used to translate the original bound on the ratio of the hidden and EM fine-structure constants. See their Fig. 3 for mass-dependent limits. 111  AGAKISHIEV 2014 look for hidden photons ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at the HADES experiment, and set limits on ${{\mathit \chi}}$ for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $0.02 - 0.6$ GeV. See their Fig. 5 for mass-dependent limits. 112  BABUSCI 2014 look for the decay ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit \mu}^{+}}$ ${{\mathit \mu}^{-}}$ in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \gamma}}$. Limits between $4 \times 10^{-3}$ and $9.0 \times 10^{-4}$ are obtained for 520 MeV $<$ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}<$ 980 MeV (see their Fig. 7). 113  BATELL 2014 derived limits from the electron beam dump experiment at SLAC (E-137) by searching for events with recoil electrons by sub-GeV dark matter produced from the decay of the hidden photon. Limits at the level of $10^{-4} - 10^{-1}$ are obtained for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ = $10^{-3} - 1$ GeV, depending on the dark matter mass and the hidden gauge coupling (see their Fig. 2). 114  BLUEMLEIN 2014 analyzed the beam dump data taken at the U-70 accelerator to look for ${{\mathit \gamma}^{\,'}}$-bremsstrahlung and the subsequent decay into muon pairs and hadrons. See their Fig. 4 for mass-dependent excluded region. 115  FRADETTE 2014 studied effects of decay of relic hidden photons on BBN and CMB to set constraints on very small values of the kinetic mixing. See their Figs. 4 and 7 for mass-dependent excluded regions. 116  LEES 2014J look for hidden photons in the reaction ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$, ${{\mathit \mu}^{+}}$ ${{\mathit \mu}^{-}}$). Limits at the level of $10^{-4} - 10^{-3}$ are obtained for 0.02 GeV $<$ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ 10.2 GeV. See their Fig. 4 for mass-dependent limits. 117  MERKEL 2014 look for ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at the A1 experiment at the Mainz Microtron (MAMI). See their Fig. 3 for mass-dependent limits. 118  AN 2013B examined the stellar production of hidden photons, correcting an important error of the production rate of the longitudinal mode which now dominates. See their Fig. 2 for mass-dependent limits based on solar energy loss. 119  AN 2013C use the solar flux of hidden photons to set a limit on the atomic ionization rate in the XENON10 experiment. They find $\chi $ ${\mathit m}_{{{\mathit \gamma}^{\,'}}}$ $<$ $3 \times 10^{-12}$ eV for ${\mathit m}_{{{\mathit \gamma}^{\,'}}}<$ 1 eV. See their Fig. 2 for mass-dependent limits. 120  DIAMOND 2013 analyzed the beam dump data taken at the SLAC millicharge experiment to constrain a hidden photon invisibly decaying into lighter long-lived particles, which undergo elastic scattering off nuclei in the detector. Limits between $8 \times 10^{-4} - 2 \times 10^{-2}$ are obtained. The quoted limit is applied when the dark gauge coupling is set equal to the electromagnetic coupling. See their Fig.4 for mass-dependent limits. 121  GNINENKO 2013 used the data taken at the SINDRUM experiment to constrain the decay, ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$) to derive limits. See their Fig. 2 for their mass-dependent excluded region. 122  HORVAT 2013 look for hidden-photo-electric effect in HPGe detectors induced by solar hidden photons. See their Fig. 3 for mass-dependent limits. 123  INADA 2013 search for hidden photons using an intense X-ray beamline at SPring-8. See their Fig. 4 for mass-dependent limits. 124  MIZUMOTO 2013 look for solar hidden photons. See their Fig. 5 for mass-dependent limits. 125  PARKER 2013 look for hidden photons using a cryogenic resonant microwave cavity. See their Fig.5 for mass-dependent limits. 126  PARKER 2013 derived a limit for the hidden photon CDM with a randomly oriented hidden photon field. 127  REDONDO 2013 examined the solar emission of hidden photons including the enhancement factor for the longitudinal mode pointed out by AN 2013B, and also updated stellar-energy loss arguments. See their Fig.3 for mass-dependent limits, including a review of the currently best limits from other arguments. 128  GNINENKO 2012A obtained bounds on B( ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$) $\cdot{}$ B( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$) from the NOMAD and PS191 neutrino experiments, and derived limits between $8 \times 10^{-8} - 2 \times 10^{-4}$. See their Fig.4 for mass-dependent excluded regions. 129  GNINENKO 2012B used the data taken at the CHARM experiment to constrain the decay, ${{\mathit \eta}}({{\mathit \eta}^{\,'}}$) $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$), and derived limits between $1 \times 10^{-7} - 1 \times 10^{-4}$. See their Fig.4 for mass-dependent excluded region. 130  ABRAHAMYAN 2011 look for ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ in the electron-nucelon fixed-target experiment at the Jefferson Laboratory (APEX). See their Fig. 5 for mass-dependent limits. 131  BLUEMLEIN 2011 analyzed the beam dump data taken at the U-70 accelerator to look for ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}^{\,'}}$ ( ${{\mathit \gamma}^{\,'}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$). See their Fig. 5 for mass-dependent limits. 132  BJORKEN 2009 analyzed the beam dump data taken at E137, E141, and E774 to constrain a hidden photon produced by bremsstrahlung, subsequently decaying into ${{\mathit e}^{+}}{{\mathit e}^{-}}$, and derived limits between $10^{-7}$ and $10^{-2}$. See their Fig. 1 for mass-dependent excluded region. 133  BJORKEN 2009 required the energy loss in the ${{\mathit \gamma}^{\,'}}$ emission from the core of SN1987A not to exceed $10^{53}$ erg/s, and derived limits between $5 \times 10^{-9}$ and $2 \times 10^{-6}$. See their Fig. 1 for mass-dependent excluded region.

References