Study of X(3915) --> J/ψω in two-photon collisions

Abstract

We study the process $\gamma \gamma \to J/\psi \omega$ using a data sample of 519.2 $f{b}^{-1}$ recorded by the BaBar detector at SLAC at the PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider at center-of-mass energies near the ${\rm Y}(nS)$ ($n=2,3,4$) resonances. We confirm the existence of the charmonium-like resonance X(3915) decaying to $J/\psi \omega$ with a significance of 7.6 standard deviations, including systematic uncertainties, and measure its mass $(3919.4\pm 2.2\pm 1.6)MeV/c^2$ and width $(13\pm 6\pm 3)MeV$, 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 ${\chi }_{c0}(2P)$ resonance. In this hypothesis we determine the product between the two-photon width and the final state branching fraction to be $(52\pm 10\pm 3)eV$

12 pages, 8 postscript figures, to be published in Physical Review D

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