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${{\mathit X}{(3940)}}$ MASS

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M029M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 3942 \pm9}$ OUR AVERAGE $3945$ ${}^{+28}_{-17}$ ${}^{+37}_{-28}$ 1.6k 1 AAIJ 2024 AB LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit D}^{*\pm}}{{\mathit D}^{\mp}}{{\mathit K}^{+}}$ $3942$ ${}^{+7}_{-6}$ $\pm6$ 52 PAKHLOV 2008 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit X}}$ • • We do not use the following data for averages, fits, limits, etc. • • $3943$ $\pm6$ $\pm6$ 25 2 ABE 2007 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit X}}$ $3936$ $\pm14$ 266 3 ABE 2007 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$( ${{\mathit c}}{{\overline{\mathit c}}}$) 1  From a simultaneous amplitude analysis of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit D}^{*+}}{{\mathit D}^{-}}{{\mathit K}^{+}}$, ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit D}^{*-}}{{\mathit D}^{+}}{{\mathit K}^{+}}$ and their c.c. 2  From a fit to ${{\mathit D}^{*+}}{{\mathit D}^{-}}$ and ${{\mathit D}^{*0}}{{\overline{\mathit D}}^{0}}$ events. 3  From the inclusive fit. Not independent of the exclusive measurement by ABE 2007.

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