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${{\mathit a}_{{2}}{(1700)}}$ MASS

INSPIRE   PDGID:

M162M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 1706 \pm14}$ OUR AVERAGE  Error includes scale factor of 1.2. $1681$ ${}^{+22}_{-35}$ 46M 1, 2 AGHASYAN 2018 B COMP 190 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1726$ $\pm12$ $\pm25$ 2 ABLIKIM 2017 K BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $1722$ $\pm9$ $\pm15$ 18k 3 SCHEGELSKY 2006 RVUE ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $1660$ $\pm40$ 2 ABELE 1999 B CBAR $1.94$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ • • We do not use the following data for averages, fits, limits, etc. • • $1720$ $\pm10$ $\pm60$ 4 JACKURA 2018 RVUE ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{-}}{{\mathit p}}$ $1675$ $\pm25$ ANISOVICH 2009 RVUE 0.0 ${{\overline{\mathit p}}}{{\mathit p}}$ , ${{\mathit \pi}}{{\mathit N}}$ $1702$ $\pm7$ 80k 5 UMAN 2006 E835 5.2 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$ $1721$ $\pm13$ $\pm44$ 145k LU 2005 B852 18 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit p}}$ $1737$ $\pm5$ $\pm7$ ABE 2004 BELL 10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ $1767$ $\pm14$ 221 6 ACCIARRI 2001 H L3 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ , ${\it{}E}^{\it{}ee}_{\rm{}cm}$= 91, $183 - 209$ GeV $\sim$$1775$ 7 GRYGOREV 1999 SPEC 40 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit n}}$ $1752$ $\pm21$ $\pm4$ ACCIARRI 1997 T L3 ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ 1  Statistical error negligible. 2  Breit-Wigner mass. 3  From analysis of L3 data at $183 - 209$ GeV. 4  Superseded by RODAS 2019 . 5  Statistical error only. 6  Spin 2 dominant, isospin not determined, could also be $\mathit I$=1. 7  Possibly two $\mathit J{}^{P} = 2{}^{+}$ resonances with isospins 0 and 1.

References:

AGHASYAN 2018B PR D98 092003 Light isovector resonances in $\pi^- p \to \pi^-\pi^-\pi^+ p$ at 190 GeV/${\it c}$ JACKURA 2018 PL B779 464 New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment ABLIKIM 2017K PR D95 032002 Amplitude Analysis of the ${{\mathit \chi}_{{c1}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decays ANISOVICH 2009 IJMP A24 2481 The Combined Analysis of ${{\mathit \pi}}$ ${{\mathit N}}$ $\rightarrow$ two mesons ${+}$ ${{\mathit N}}$ Reactions within Reggeon Exchanges and Data for ${{\mathit p}}$ ${{\overline{\mathit p}}}$ (at rest) $\rightarrow$ three mesons SCHEGELSKY 2006 EPJ A27 199 Partial Wave Analysis of ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Production in Two-Photon Collisions at LEP UMAN 2006 PR D73 052009 Light Quark Resonances in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at 5.2 GeV/$\mathit c$ LU 2005 PRL 94 032002 Exotic Meson Decay to ${{\mathit \omega}}{{\mathit \pi}^{0}}{{\mathit \pi}^{-}}$ ABE 2004 EPJ C32 323 Measurement of ${{\mathit K}^{+}}{{\mathit K}^{-}}$ Production in Two Photon Collisions in the Resonant Mass Region ACCIARRI 2001H PL B501 173 ${{\mathit K}_S^0}{{\mathit K}_S^0}$ Final State in Two Photon Collisions and Implications for Glueballs ABELE 1999B EPJ C8 67 Observation of Resonances in the Reaction ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ at 1.94 ${\mathrm {GeV/}}\mathit c{}^{2}$ GRYGOREV 1999 PAN 62 470 Investigation of a Resonance Structure in the System of Two ${{\mathit K}_S^0}$ Mesons in the Mass Region Around 1775 MeV ACCIARRI 1997T PL B413 147 Resonance Formation in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Final State in Two Photon Collisions