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.

Study of dipion bottomonium transitions and search for the h_{b}(1P) state / J., L., V., P., V., T., J., G.T., E., G., M., M., D., M., A., P., M., P., G., E., B., S., L., S., D., B., L., K., Kolomensky, Y.u., G., L., H., K., T., S., D., A., C., H., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 84:(2011), pp. 011104(R)-1-011104(R)-9. [10.1103/PhysRevD.84.011104]

Study of dipion bottomonium transitions and search for the h_{b}(1P) state

LANCERI, LIVIO;VITALE, LORENZO;
2011-01-01

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2567030
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