Measurements of the Mass, Total Width, and Two-Photon Partial Width of the ηc Meson

Le résumé fourni par la source

Using $13.4{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay ${\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}{K}_{S}^{0}{K}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$. We have measured the ${\ensuremath{\eta}}_{c}$ mass to be $[2980.4\ifmmode\pm\else\textpm\fi{}2.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.6(\mathrm{syst})]\mathrm{MeV}$ and its full width as $[27.0\ifmmode\pm\else\textpm\fi{}5.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.4(\mathrm{syst})]\mathrm{MeV}$. We have determined the two-photon partial width of the ${\ensuremath{\eta}}_{c}$ meson to be $[7.6\ifmmode\pm\else\textpm\fi{}0.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}2.3(\mathrm{br})]\mathrm{keV}$, with the last uncertainty associated with the decay branching fraction.

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