#### ${{\boldsymbol X}{(3940)}}$ MASS

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$3942$ ${}^{+7}_{-6}$ $\pm6$ 52
 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 1
 2007
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit X}}$
$3936$ $\pm14$ 266 2
 2007
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}$( ${{\mathit c}}{{\overline{\mathit c}}}$)
 1 From a fit to ${{\mathit D}^{*+}}{{\mathit D}^{-}}$ and ${{\mathit D}^{*0}}{{\overline{\mathit D}}^{0}}$ events.
 2 From the inclusive fit. Not independent of the exclusive measurement by ABE 2007 .
References:
 PAKHLOV 2008
PRL 100 202001 Production of New Charmoniumlike States in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit D}^{(*)}}{{\overline{\mathit D}}^{(*)}}$ at $\sqrt {s }$ $\simeq{}$ 10.6 GeV
 ABE 2007
PRL 98 082001 Observation of a Charmoniumlike State Produced in Association with ${{\mathit J / \psi}}$ in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation at $\sqrt {s }$ $\sim{}$ 10.6 GeV