We study the process e+e−→J/ψπ+π− with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BABAR detector at center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454  fb−1. We investigate the J/ψπ+π− mass distribution in the region from 3.5 to 5.5  GeV/c2. Below 3.7  GeV/c2 the ψ(2S) signal dominates, and above 4  GeV/c2 there is a significant peak due to the Y(4260). A fit to the data in the range 3.74–5.50  GeV/c2 yields a mass value 4245±5(stat)±4(syst)  MeV/c2 and a width value 114+16−15(stat)±7(syst)  MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01  GeV/c2. In addition, we investigate the π+π− system which results from Y(4260) decay.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Study of the reaction e(+)e(-) -> J/psi pi(+)pi(-) via initial-state radiation at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(5), 1-9 [10.1103/PhysRevD.86.051102].

Study of the reaction e(+)e(-) -> J/psi pi(+)pi(-) via initial-state radiation at BABAR

PATRIGNANI, CLAUDIA;
2012

Abstract

We study the process e+e−→J/ψπ+π− with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the BABAR detector at center-of-mass energies 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454  fb−1. We investigate the J/ψπ+π− mass distribution in the region from 3.5 to 5.5  GeV/c2. Below 3.7  GeV/c2 the ψ(2S) signal dominates, and above 4  GeV/c2 there is a significant peak due to the Y(4260). A fit to the data in the range 3.74–5.50  GeV/c2 yields a mass value 4245±5(stat)±4(syst)  MeV/c2 and a width value 114+16−15(stat)±7(syst)  MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01  GeV/c2. In addition, we investigate the π+π− system which results from Y(4260) decay.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Study of the reaction e(+)e(-) -> J/psi pi(+)pi(-) via initial-state radiation at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(5), 1-9 [10.1103/PhysRevD.86.051102].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; 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/11585/537375
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