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

The BaBar Collaboration, Philip Clark

Research output: Contribution to journalArticlepeer-review


We study the process γγ→J/ψω using a data sample of 519.2 fb−1 recorded by the BaBar detector at SLAC at the PEP-II asymmetric-energy e+e− collider at center-of-mass energies near the Υ(nS) (n=2,3,4) resonances. We confirm the existence of the charmonium-like resonance X(3915) decaying to J/ψω with a significance of 7.6 standard deviations, including systematic uncertainties, and measure its mass (3919.4±2.2±1.6)MeV/c2 and width (13±6±3)MeV, where the first uncertainty is statistical and the second systematic. A spin-parity analysis supports the assignment JP=0+ and therefore the identification of the signal as due to the χc0(2P) resonance. In this hypothesis we determine the product between the two-photon width and the final state branching fraction to be (52±10±3)eV
Original languageEnglish
Pages (from-to)072002
Number of pages1
JournalPhysical Review D
Early online date12 Jul 2012
Publication statusPublished - 1 Oct 2012

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