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${{\mathit \eta}_{{{c}}}{(2S)}}$ MASS

INSPIRE   PDGID:

M059M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3637.7 \pm0.9}$ OUR AVERAGE  Error includes scale factor of 1.2. $3637.90$ $\pm0.54$ $\pm1.40$ 3.7k AAIJ 2023 AH LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}$( ${{\mathit K}_S^0}$ ${{\mathit K}}{{\mathit \pi}}$) $3643.4$ $\pm2.3$ $\pm4.4$ 569 ABLIKIM 2022 Q BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$3( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) $3635.1$ $\pm3.7$ $\pm2.9$ 106 XU 2018 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $3633.6$ $\pm1.7$ $\pm0.6$ 106 1 AAIJ 2017 AD LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit B}^{+}}{{\mathit X}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit K}^{+}}{{\mathit X}}$ $3636.4$ $\pm4.1$ $\pm0.7$ 365 2 AAIJ 2017 BB LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit X}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}$) ${{\mathit X}}$ $3637.0$ $\pm5.7$ $\pm3.4$ 178 3, 4 LEES 2014 E BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ $3635.1$ $\pm5.8$ $\pm2.1$ 47 3, 5 LEES 2014 E BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}}$ $3646.9$ $\pm1.6$ $\pm3.6$ 57 ABLIKIM 2013 K BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $3637.6$ $\pm2.9$ $\pm1.6$ 127 6 ABLIKIM 2012 G BES3 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{0}}{{\mathit K}}{{\mathit \pi}}$ , ${{\mathit K}}{{\mathit K}}{{\mathit \pi}^{0}}$ $3638.5$ $\pm1.5$ $\pm0.8$ 624 3 DEL-AMO-SANCH.. 2011 M BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ $3640.5$ $\pm3.2$ $\pm2.5$ 1201 3 DEL-AMO-SANCH.. 2011 M BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $3636.1$ ${}^{+3.9}_{-4.2}$ ${}^{+0.7}_{-2.0}$ 128 7 VINOKUROVA 2011 BELL ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}({{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$) $3626$ $\pm5$ $\pm6$ 311 8 ABE 2007 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$( ${{\mathit c}}{{\overline{\mathit c}}}$) $3645.0$ $\pm5.5$ ${}^{+4.9}_{-7.8}$ 121 AUBERT 2005 C BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit c}}{{\overline{\mathit c}}}$ $3642.9$ $\pm3.1$ $\pm1.5$ 61 ASNER 2004 CLEO ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}^{\,'}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ • • We do not use the following data for averages, fits, limits, etc. • • $3639$ $\pm7$ 98 9 AUBERT 2006 E BABR ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit K}^{\pm}}{{\mathit X}}_{{{\mathit c}} {{\overline{\mathit c}}}}$ $3630.8$ $\pm3.4$ $\pm1.0$ 112 10 AUBERT 2004 D BABR ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{{c}}}{(2S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $3654$ $\pm6$ $\pm8$ 39 11 CHOI 2002 BELL ${{\mathit B}}$ $\rightarrow$ ${{\mathit K}}{{\mathit K}_{{{S}}}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ $3594$ $\pm5$ 12 EDWARDS 1982 C CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}$ X 1  AAIJ 2017AD report ${\mathit m}_{{{\mathit \psi}{(2S)}}}–{\mathit m}_{{{\mathit \eta}_{{{c}}}{(2S)}}}$ = $52.5$ $\pm1.7$ $\pm0.6$ MeV. We use the current value ${\mathit m}_{{{\mathit \psi}{(2S)}}}$ = $3686.097$ $\pm0.025$ MeV to obtain the quoted mass. 2  From a fit of the ${{\mathit \phi}}{{\mathit \phi}}$ invariant mass with the width of ${{\mathit \eta}_{{{c}}}{(2S)}}$ fixed to the PDG 2016 value. 3  Ignoring possible interference with continuum. 4  With a width fixed to 11.3 MeV. 5  With a width fixed to 11.3 MeV. Using both ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ and ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ decays. 6  From a simultaneous fit to ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$ and ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$ decay modes. 7  Accounts for interference with non-resonant continuum. 8  From a fit of the ${{\mathit J / \psi}}$ recoil mass spectrum. Supersedes ABE,K 2002 and ABE 2004G. 9  From the fit of the kaon momentum spectrum. Systematic errors not evaluated. 10  Superseded by DEL-AMO-SANCHEZ 2011M. 11  Superseded by VINOKUROVA 2011. 12  Assuming mass of ${{\mathit \psi}{(2S)}}$ = 3686 MeV.

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