The first observation of the decay Bs 0 → φK̄*0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions at √s = 7 TeV, collected with the LHCb detector. A yield of 30 ± 6 Bs 0 → (K+K-)(K -π+) decays is found in the mass windows 1012:5 < M(K+K) < 1026:5MeV/c2 and 746 < M(K -π+) < 1046MeV/c2. The signal yield is found to be dominated by Bs 0 → φK̄* 0 decays, and the corresponding branching fraction is measured to be B(Bs 0 → φK̄*0) = (1:10 ± 0:24 (stat) ± 0:14 (syst) ± 0:08 (fd/f s)) × 10-6, where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions fd/f s which accounts for the different production rate of B0 and Bs 0 mesons. The significance of Bs 0 → φK̄*0 signal is 6.1 standard deviations. The fraction of longitudinal polarization in Bs 0 → φK̄*0 decays is found to be f 0 = 0:51 ± 0:15 (stat) ± 0:07 (syst). Copyright CERN.

First observation of the decay Bs 0 → φ K̄*0 / R., A., C. b., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L. b., A., J., A., R., A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2013:11(2013). [10.1007/jhep11(2013)092]

First observation of the decay Bs 0 → φ K̄*0

G. Casse;SARTI, ALESSIO;SCIUBBA, Adalberto;
2013

Abstract

The first observation of the decay Bs 0 → φK̄*0 is reported. The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions at √s = 7 TeV, collected with the LHCb detector. A yield of 30 ± 6 Bs 0 → (K+K-)(K -π+) decays is found in the mass windows 1012:5 < M(K+K) < 1026:5MeV/c2 and 746 < M(K -π+) < 1046MeV/c2. The signal yield is found to be dominated by Bs 0 → φK̄* 0 decays, and the corresponding branching fraction is measured to be B(Bs 0 → φK̄*0) = (1:10 ± 0:24 (stat) ± 0:14 (syst) ± 0:08 (fd/f s)) × 10-6, where the uncertainties are statistical, systematic and from the ratio of fragmentation fractions fd/f s which accounts for the different production rate of B0 and Bs 0 mesons. The significance of Bs 0 → φK̄*0 signal is 6.1 standard deviations. The fraction of longitudinal polarization in Bs 0 → φK̄*0 decays is found to be f 0 = 0:51 ± 0:15 (stat) ± 0:07 (syst). Copyright CERN.
2013
flavour changing neutral currents; hadron-hadron scattering; flavor physics; b physics
01 Pubblicazione su rivista::01a Articolo in rivista
First observation of the decay Bs 0 → φ K̄*0 / R., A., C. b., A., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L. b., A., J., A., R., A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 2013:11(2013). [10.1007/jhep11(2013)092]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/665046
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