Study ofX(3915)→J/ψωin two-photon collisions

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Abstract

We study the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\omega}$ using a data sample of $519.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded by the BABAR detector at SLAC at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at center-of-mass energies near the $\ensuremath{\Upsilon}(nS)$ ($n=2,3,4$) resonances. We confirm the existence of the charmoniumlike resonance $X(3915)$ decaying to $J/\ensuremath{\psi}\ensuremath{\omega}$ with a significance of 7.6 standard deviations, including systematic uncertainties, and measure its mass $(3919.4\ifmmode\pm\else\textpm\fi{}2.2\ifmmode\pm\else\textpm\fi{}1.6)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and width $(13\ifmmode\pm\else\textpm\fi{}6\ifmmode\pm\else\textpm\fi{}3)\text{ }\text{ }\mathrm{MeV}$, where the first uncertainty is statistical and the second systematic. A spin-parity analysis supports the assignment ${J}^{P}={0}^{+}$ and therefore the identification of the signal as due to the ${\ensuremath{\chi}}_{c0}(2P)$ resonance. In this hypothesis we determine the product between the two-photon width and the final state branching fraction to be $(52\ifmmode\pm\else\textpm\fi{}10\ifmmode\pm\else\textpm\fi{}3)\text{ }\text{ }\mathrm{eV}$.

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