Starting from a sample of four million hadronic Z decays collected with the ALEPH detector at LEP, 404 charged and neutral B mesons are fully reconstructed and used to look for resonant structure in the B pi. system. An excess of events is observed above the expected background in the B pi mass spectrum at a mass approximate to 5.7 GeV/c(2), consistent with the production and decay to B(*)pi of the B** states predicted by Heavy Quark Symmetry (HQS). In the framework of HQS, it is found that the mass of the B-2* State is (5739(-11)(+8)(stat)(-4)(+6)(syst))MeV/c(2) and the relative production rate of the B ** system is BR(b --> B** --> B(*)pi)/BR(b --> Bu,d)= (31 +/- 9(stat)(-5)(+6)(syst))%. In the same sample of B mesons, significant B pi(+/-) charge-flavour correlations are observed, which may prove important for tagging the initial B state in future CP violation studies.

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Resonant structure and flavour tagging in the B pi(+/-) system using fully reconstructed B decays. PHYSICS LETTERS. SECTION B, 425(1-2), 215-226 [10.1016/S0370-2693(98)00180-4].

Resonant structure and flavour tagging in the B pi(+/-) system using fully reconstructed B decays

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1998-01-01

Abstract

Starting from a sample of four million hadronic Z decays collected with the ALEPH detector at LEP, 404 charged and neutral B mesons are fully reconstructed and used to look for resonant structure in the B pi. system. An excess of events is observed above the expected background in the B pi mass spectrum at a mass approximate to 5.7 GeV/c(2), consistent with the production and decay to B(*)pi of the B** states predicted by Heavy Quark Symmetry (HQS). In the framework of HQS, it is found that the mass of the B-2* State is (5739(-11)(+8)(stat)(-4)(+6)(syst))MeV/c(2) and the relative production rate of the B ** system is BR(b --> B** --> B(*)pi)/BR(b --> Bu,d)= (31 +/- 9(stat)(-5)(+6)(syst))%. In the same sample of B mesons, significant B pi(+/-) charge-flavour correlations are observed, which may prove important for tagging the initial B state in future CP violation studies.
1998
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Resonant structure and flavour tagging in the B pi(+/-) system using fully reconstructed B decays. PHYSICS LETTERS. SECTION B, 425(1-2), 215-226 [10.1016/S0370-2693(98)00180-4].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37883
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