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.

Study of X (3915) -> J/psi omega in two-photon collisions / J. P., L., V., P., V., T., J. G., T., E., G., A., P., G., E., B., S., D. N., B., L. T., K., Y. G., K., G., L., H., K., T., S., D. J., A., C., H., T. S., M., J. A., M., R. Y., S.o., A., K., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 86:(2012), p. 072002. [10.1103/physrevd.86.072002]

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

FACCINI, Riccardo;FERRONI, Fernando;
2012

Abstract

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.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Study of X (3915) -> J/psi omega in two-photon collisions / J. P., L., V., P., V., T., J. G., T., E., G., A., P., G., E., B., S., D. N., B., L. T., K., Y. G., K., G., L., H., K., T., S., D. J., A., C., H., T. S., M., J. A., M., R. Y., S.o., A., K., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 86:(2012), p. 072002. [10.1103/physrevd.86.072002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/519155
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