Using a sample of 122×106 Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the hb(1P) spin-singlet partner of the P-wave χbJ(1P) states in the sequential decay Υ(3S)→π0hb(1P), hb(1P)→γηb(1S). We observe an excess of events above background in the distribution of the recoil mass against the π0 at mass 9902±4(stat)±2(syst)  MeV/c2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10-4 for the product branching fraction B(Υ(3S)→π0hb)×B(hb→γηb).

Evidence for the h_{b}(1P) meson in the decay Υ(3S)→π^{0}h_{b}(1P) / J., L., V., P., E., 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., I., O., H., K., T., S., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 84:(2011), pp. 091101(R)-1-091101(R)-8. [10.1103/PhysRevD.84.091101]

Evidence for the h_{b}(1P) meson in the decay Υ(3S)→π^{0}h_{b}(1P)

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

Abstract

Using a sample of 122×106 Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the hb(1P) spin-singlet partner of the P-wave χbJ(1P) states in the sequential decay Υ(3S)→π0hb(1P), hb(1P)→γηb(1S). We observe an excess of events above background in the distribution of the recoil mass against the π0 at mass 9902±4(stat)±2(syst)  MeV/c2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10-4 for the product branching fraction B(Υ(3S)→π0hb)×B(hb→γηb).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2568422
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