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PRODUCED IN ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ANNIHILATION AND PARTICLE DECAYS

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M013M3

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1514 \pm4}$ OUR AVERAGE  Error includes scale factor of 3.6.  See the ideogram below. $1515.4$ $\pm2.5$ ${}^{+3.2}_{-7.6}$ 126K ABLIKIM 2023 M BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ $1522.2$ $\pm2.8$ ${}^{+5.3}_{-2.0}$ AAIJ 2013 AN LHCB ${{\overline{\mathit B}}_{{{s}}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1513$ $\pm5$ ${}^{+4}_{-10}$ 5.5k 1 ABLIKIM 2013 N BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \eta}}$ $1525.3$ ${}^{+1.2}_{-1.4}$ ${}^{+3.7}_{-2.1}$ UEHARA 2013 BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1521$ $\pm5$ ABLIKIM 2005 BES2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1518$ $\pm1$ $\pm3$ ABE 2004 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1519$ $\pm2$ ${}^{+15}_{-5}$ BAI 2003 G BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}}{{\overline{\mathit K}}}$ $1523$ $\pm6$ 331 2 ACCIARRI 2001 H L3 91, $183 - 209$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1535$ $\pm5$ $\pm4$ ABREU 1996 C DLPH ${{\mathit Z}^{0}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$ + X $1516$ $\pm5$ ${}^{+9}_{-15}$ BAI 1996 C BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1531.6$ $\pm10.0$ AUGUSTIN 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1496$ $\pm2$ 3 FALVARD 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1525$ $\pm10$ $\pm10$ BALTRUSAITIS 1987 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1518$ $\pm3$ 4 KLEMPT 2022 RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ , ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1503$ $\pm11$ 5 RODAS 2022 RVUE ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ (${{\mathit \pi}}{{\mathit \pi}}$ , ${{\mathit K}}{{\overline{\mathit K}}}$) $1532$ $\pm3$ $\pm6$ 644 6, 7 DOBBS 2015 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1557$ $\pm9$ $\pm3$ 113 6, 7 DOBBS 2015 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1526$ $\pm7$ 29 8 LEES 2014 H BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \gamma}}$ $1523$ $\pm5$ 870 9 SCHEGELSKY 2006 A RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $1515$ $\pm5$ 10 FALVARD 1988 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ 1  From partial wave analysis including all possible combinations of 0${}^{++}$, 2${}^{++}$, and 4${}^{++}$ resonances. 2  Supersedes ACCIARRI 1995J. 3  From an analysis including interference with ${{\mathit f}_{{{0}}}{(1710)}}$. 4  Fit of the tensor partial waves from BES3 in the multipole basis. 5  T-matrix pole from coupled channel K-matrix fit to data on ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ (ABLIKIM 2015AE) and ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ (ABLIKIM 2018AA). 6  Using CLEO-c data but not authored by the CLEO Collaboration. 7  From a fit to a Breit-Wigner line shape with fixed $\Gamma $ = 73 MeV. 8  From a fit to a Breit-Wigner line shape plus a second-order polynomial function. Systematic errors not evaluated. 9  From analysis of L3 data at 91 and $183 - 209$ GeV. 10  From an analysis ignoring interference with ${{\mathit f}_{{{0}}}{(1710)}}$.

${{\mathit f}_{{{2}}}^{\,'}{(1525)}}$ mass, ${{\mathit e}^{+}}{{\mathit e}^{-}}$ annihilation and particle decays (MeV)

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