We study inclusive dipion decays using a sample of 108×106Υ(3S) events recorded with the BABAR detector. We search for the decay mode Υ(3S)→π+π−hb(1P) and find no evidence for the bottomonium spin-singlet state hb(1P) in the invariant mass distribution recoiling against the π+π− system. Assuming the hb(1P) mass to be 9.900  GeV/c2, we measure the upper limit on the branching fraction ℬ[Υ(3S)→π+π−hb(1P)]<1.2×10−4, at 90% confidence level. We also investigate the χbJ(2P)→π+π−χbJ(1P), Υ(3S)→π+π−Υ(2S), and Υ(2S)→π+π−Υ(1S) dipion transitions and present an improved measurement of the branching fraction of the Υ(3S)→π+π−Υ(2S) decay and of the Υ(3S)−Υ(2S) mass difference.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., et al. (2011). Study of dipion bottomonium transitions and search for the h(b)(1P) state. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(1), 1-9 [10.1103/PhysRevD.84.011104].

Study of dipion bottomonium transitions and search for the h(b)(1P) state

PATRIGNANI, CLAUDIA;
2011

Abstract

We study inclusive dipion decays using a sample of 108×106Υ(3S) events recorded with the BABAR detector. We search for the decay mode Υ(3S)→π+π−hb(1P) and find no evidence for the bottomonium spin-singlet state hb(1P) in the invariant mass distribution recoiling against the π+π− system. Assuming the hb(1P) mass to be 9.900  GeV/c2, we measure the upper limit on the branching fraction ℬ[Υ(3S)→π+π−hb(1P)]<1.2×10−4, at 90% confidence level. We also investigate the χbJ(2P)→π+π−χbJ(1P), Υ(3S)→π+π−Υ(2S), and Υ(2S)→π+π−Υ(1S) dipion transitions and present an improved measurement of the branching fraction of the Υ(3S)→π+π−Υ(2S) decay and of the Υ(3S)−Υ(2S) mass difference.
2011
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., et al. (2011). Study of dipion bottomonium transitions and search for the h(b)(1P) state. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(1), 1-9 [10.1103/PhysRevD.84.011104].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537446
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