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${{\mathit \psi}_{{2}}{(3823)}}$ MASS

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M212M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3823.5 \pm0.5}$ OUR AVERAGE  Error includes scale factor of 1.4. $3823.12$ $\pm0.43$ $\pm0.13$ 120 ABLIKIM 2022 R BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ $3824.08$ $\pm0.53$ $\pm0.14$ 137 1 AAIJ 2020 S LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit K}^{+}}$ $3823.1$ $\pm1.8$ $\pm0.7$ $33$ $\pm10$ 2 BHARDWAJ 2013 BELL ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}{{\mathit K}^{\pm}}$ • • We do not use the following data for averages, fits, limits, etc. • • $3821.7$ $\pm1.3$ $\pm0.7$ $19$ $\pm5$ 3 ABLIKIM 2015 S BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ 1  Using the measured ${\mathit m}_{{{\mathit \psi}_{{2}}{(3823)}}}–{\mathit m}_{{{\mathit \psi}{(2S)}}}$ = $137.98$ $\pm0.53$ $\pm0.14$ MeV. 2  From a simultaneous fit to ${{\mathit B}^{\pm}}$ $\rightarrow$ ( ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$) ${{\mathit K}^{\pm}}$ and ${{\mathit B}^{0}}$ $\rightarrow$ ( ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$) ${{\mathit K}_S^0}$ with significance 4.0$\sigma $ including systematics. Corrected for the measured ${{\mathit \psi}{(2S)}}$ mass using ${{\mathit B}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit K}}$ $\rightarrow$ ( ${{\mathit \gamma}}{{\mathit \chi}_{{c1}}}$) ${{\mathit K}}$ decays. 3  From a simultaneous unbinned maximum likelihood fit of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ data (the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ recoil mass) taken at $\sqrt {s }$ values of 4.23, 4.26, 4.36, 4.42, and 4.60 GeV to simulated events including both ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ and ${{\mathit \psi}_{{2}}{(3823)}}$ $\rightarrow$ ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ together, with floating mass scale offset for ${{\mathit \psi}{(2S)}}$, floating ${{\mathit \psi}_{{2}}{(3823)}}$ mass, and zero ${{\mathit \psi}_{{2}}{(3823)}}$ width, resulting in a significance of 5.9$\sigma $ when including systematic uncertainties. Superseded by ABLIKIM 22R.

References:

ABLIKIM 2022R PRL 129 102003 Observation of resonance structures in $e^+e^-\to \pi^+\pi^-\psi_2(3823)$ and mass measurement of $\psi_2(3823)$ AAIJ 2020S JHEP 2008 123 Study of the $\psi_2(3823)$ and $\chi_{c1}(3872)$ states in $B^+ \rightarrow \left( J\psi\pi^+\pi^-\right)K^+$ decays ABLIKIM 2015S PRL 115 011803 Observation of the ${{\mathit \psi}}(1{}^{3}D_{2}$) State in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}{{\mathit \chi}_{{c1}}}$ at BESIII BHARDWAJ 2013 PRL 111 032001 Evidence of a New Narrow Resonance Decaying to ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ in ${{\mathit B}}$ $\rightarrow$ ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}{{\mathit K}}$