Using a sample of 122 x 10(6) Y(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we search for the h(b)(1P) spin-singlet partner of the P-wave X-bJ(1P) states in the sequential decay Y(3S) -> pi(0)h(b) (1P), hb(1P) -> gamma eta(b)(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi(0) at mass 9902 +/- 4(stat) +/- 2(syst) MeV/c(2). The width of the observed signal is consistent with experimental resolution, and its significance is 3.1 sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat) +/- 0.9(syst) x 10(-4) for the product branching fraction B(Y(3S) -> pi(0)h(b)) XB (h(b) -> gamma eta(b))

Evidence for the h(b)(1P) meson in the decay Y(3S) -> pi(0)h(b)(1P) / J. p., L., V., P., E., P., V., T., J. g., T., E., G., M., M., D. a., M., A., P., M., P., G., E., B., S., L., S., D. n., B., L. t., K., Y. g., K., G., L., I. l., O., H., K., T., S., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 84:(2011), p. 091101. [10.1103/physrevd.84.091101]

Evidence for the h(b)(1P) meson in the decay Y(3S) -> pi(0)h(b)(1P)

CAVOTO, Gianluca;FACCINI, Riccardo;FERRONI, Fernando;
2011

Abstract

Using a sample of 122 x 10(6) Y(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we search for the h(b)(1P) spin-singlet partner of the P-wave X-bJ(1P) states in the sequential decay Y(3S) -> pi(0)h(b) (1P), hb(1P) -> gamma eta(b)(1S). We observe an excess of events above background in the distribution of the recoil mass against the pi(0) at mass 9902 +/- 4(stat) +/- 2(syst) MeV/c(2). The width of the observed signal is consistent with experimental resolution, and its significance is 3.1 sigma, including systematic uncertainties. We obtain the value (4.3 +/- 1.1(stat) +/- 0.9(syst) x 10(-4) for the product branching fraction B(Y(3S) -> pi(0)h(b)) XB (h(b) -> gamma eta(b))
2011
01 Pubblicazione su rivista::01a Articolo in rivista
Evidence for the h(b)(1P) meson in the decay Y(3S) -> pi(0)h(b)(1P) / J. p., L., V., P., E., P., V., T., J. g., T., E., G., M., M., D. a., M., A., P., M., P., G., E., B., S., L., S., D. n., B., L. t., K., Y. g., K., G., L., I. l., O., H., K., T., S., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 84:(2011), p. 091101. [10.1103/physrevd.84.091101]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/440269
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