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 charmoniumlike 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.

Lees, J.P., Poireau, V., Tisserand, V., Tico, J.G., Grauges, E., Palano, A., et al. (2012). Study of X (3915) -> J/psi omega in two-photon collisions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(7), 1-10 [10.1103/PhysRevD.86.072002].

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

PATRIGNANI, CLAUDIA;
2012

Abstract

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 charmoniumlike 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.
2012
Lees, J.P., Poireau, V., Tisserand, V., Tico, J.G., Grauges, E., Palano, A., et al. (2012). Study of X (3915) -> J/psi omega in two-photon collisions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(7), 1-10 [10.1103/PhysRevD.86.072002].
Lees, J. P.; Poireau, V.; Tisserand, V.; Tico, J. Garra; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu G.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537418
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