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${{\mathit \chi}_{{{c2}}}{(1P)}}$ MASS

INSPIRE   PDGID:

M057M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3556.17 \pm0.07}$ OUR AVERAGE $3557.3$ $\pm1.7$ $\pm0.7$ 611 1 AAIJ 2017 BB LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit X}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}$) ${{\mathit X}}$ $3556.10$ $\pm0.06$ $\pm0.11$ 4.0k 2 AAIJ 2017 BI LHCB ${{\mathit \chi}_{{{c2}}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $3555.3$ $\pm0.6$ $\pm2.2$ 2.5k UEHARA 2008 BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ hadrons $3555.70$ $\pm0.59$ $\pm0.39$ ABLIKIM 2005 G BES2 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c2}}}}$ $3556.173$ $\pm0.123$ $\pm0.020$ ANDREOTTI 2005 A E835 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ $3559.9$ $\pm2.9$ EISENSTEIN 2001 CLE2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \chi}_{{{{c2}}}}}$ $3556.4$ $\pm0.7$ BAI 1999 B BES ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $3556.22$ $\pm0.131$ $\pm0.020$ 585 3 ARMSTRONG 1992 E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ $3556.9$ $\pm0.4$ $\pm0.5$ 50 BAGLIN 1986 B SPEC ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ X $3557.8$ $\pm0.2$ $\pm4$ 4 GAISER 1986 CBAL ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $3553.4$ $\pm2.2$ 66 5 LEMOIGNE 1982 GOLI 185 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{}^{}\mathrm {A}$ $3555.9$ $\pm0.7$ , 6 OREGLIA 1982 CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3557$ $\pm1.5$ 69 7 HIMEL 1980 MRK2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3551$ $\pm11$ 15 BRANDELIK 1979 B DASP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3553$ $\pm4$ 7 BARTEL 1978 B CNTR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3553$ $\pm4$ $\pm4$ 7, 8 TANENBAUM 1978 MRK1 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $3563$ $\pm7$ 360 7 BIDDICK 1977 CNTR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}$ X • • We do not use the following data for averages, fits, limits, etc. • • $3555.4$ $\pm1.3$ 53 UEHARA 2013 BELL ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $3543$ $\pm10$ 4 WHITAKER 1976 MRK1 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ 1  From a fit of the ${{\mathit \phi}}{{\mathit \phi}}$ invariant mass with the width of ${{\mathit \chi}_{{{c2}}}{(1P)}}$ fixed to the PDG 2016 value. 2  AAIJ 2017BI reports also m(${{\mathit \chi}_{{{c2}}}}$) $−$ m(${{\mathit \chi}_{{{c1}}}}$) = $45.39$ $\pm0.07$ $\pm0.03$ MeV. 3  Recalculated by ANDREOTTI 2005A, using the value of ${{\mathit \psi}{(2S)}}$ mass from AULCHENKO 2003. 4  Using mass of ${{\mathit \psi}{(2S)}}$ = 3686.0 MeV. 5  ${{\mathit J / \psi}{(1S)}}$ mass constrained to 3097 MeV. 6  Assuming ${{\mathit \psi}{(2S)}}$ mass = 3686 MeV and ${{\mathit J / \psi}{(1S)}}$ mass = 3097 MeV. 7  Mass value shifted by us by amount appropriate for ${{\mathit \psi}{(2S)}}$ mass = 3686 MeV and ${{\mathit J / \psi}{(1S)}}$ mass = 3097 MeV. 8  From a simultaneous fit to radiative and hadronic decay channels.

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