pdgLive Home   >   ${\mathit {\mathit c}}{\mathit {\overline{\mathit c}}}$ MESONS (including possibly non-${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$ states)   >   ${{\mathit \chi}_{{{c1}}}{(1P)}}$   >   ${{\mathit \chi}_{{{c1}}}{(1P)}}$ MASS

${{\mathit \chi}_{{{c1}}}{(1P)}}$ MASS

INSPIRE   PDGID:

M055M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3510.67 \pm0.05}$ OUR AVERAGE  Error includes scale factor of 1.2. $3509.84$ $\pm0.69$ $\pm0.64$ 2.8k AAIJ 2023 AH LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}$( ${{\mathit K}_S^0}$ ${{\mathit K}}{{\mathit \pi}}$) $3508.4$ $\pm1.9$ $\pm0.7$ 460 1 AAIJ 2017 BB LHCB ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit X}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}$) ${{\mathit X}}$ $3510.71$ $\pm0.04$ $\pm0.09$ 4.8k 2 AAIJ 2017 BI LHCB ${{\mathit \chi}_{{{c1}}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $3510.30$ $\pm0.14$ $\pm0.16$ ABLIKIM 2005 G BES2 ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{c1}}}}$ $3510.719$ $\pm0.051$ $\pm0.019$ ANDREOTTI 2005 A E835 ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ $3509.4$ $\pm0.9$ BAI 1999 B BES ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $3510.60$ $\pm0.087$ $\pm0.019$ 513 3 ARMSTRONG 1992 E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ $3511.3$ $\pm0.4$ $\pm0.4$ 30 BAGLIN 1986 B SPEC ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ X $3512.3$ $\pm0.3$ $\pm4.0$ 4 GAISER 1986 CBAL ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $3507.4$ $\pm1.7$ 91 5 LEMOIGNE 1982 GOLI 185 ${{\mathit \pi}^{-}}$ ${}^{}\mathrm {Be}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{}^{}\mathrm {A}$ $3510.4$ $\pm0.6$ OREGLIA 1982 CBAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3510.1$ $\pm1.1$ 254 6 HIMEL 1980 MRK2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3509$ $\pm11$ 21 BRANDELIK 1979 B DASP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3507$ $\pm3$ 6 BARTEL 1978 B CNTR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$2 ${{\mathit \gamma}}$ $3505.0$ $\pm4$ $\pm4$ 6, 7 TANENBAUM 1978 MRK1 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $3513$ $\pm7$ 367 6 BIDDICK 1977 CNTR ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X • • We do not use the following data for averages, fits, limits, etc. • • $3500$ $\pm10$ 40 TANENBAUM 1975 MRK1 Hadrons ${{\mathit \gamma}}$ 1  From a fit of the ${{\mathit \phi}}{{\mathit \phi}}$ invariant mass with the width of ${{\mathit \chi}_{{{c1}}}{(1P)}}$ 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  Mass value shifted by us by amount appropriate for ${{\mathit \psi}{(2S)}}$ mass = 3686 MeV and ${{\mathit J / \psi}{(1S)}}$ mass = 3097 MeV. 7  From a simultaneous fit to radiative and hadronic decay channels.

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