%0 Journal Article
%T Study of X (3915) -> J/psi omega in two-photon collisions
%A BABAR Collaboration (Lees, J. P. et al
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Villanueva-Perez, P.
%J Physical Review D
%D 2012
%V 86
%N 7
%I Amer Physical Soc
%@ 1550-7998
%G English
%F BABARCollaborationLees_etal2012
%O WOS:000309346800004
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1168), last updated on Fri, 26 Oct 2012 11:53:40 +0000
%X We study the process gamma gamma -> J/psi omega 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 gamma(nS) (n = 2, 3, 4) resonances. We confirm the existence of the charmoniumlike 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 +/- 2.2 +/- 1.6) MeV/c(2) and width (13 +/- 6 +/- 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 +/- 10 +/- 3) eV.
%R 10.1103/PhysRevD.86.072002
%U http://arxiv.org/abs/arXiv:1207.2651
%U https://doi.org/10.1103/PhysRevD.86.072002
%P 072002-10pp