From a data sample of 450000 hadronic events recorded with the ALEPH detector at LEP, 92 +/- 10 events are observed containing a J/psi meson decaying to mu+mu- or e+e-. From these data the measured inclusive branching fraction for a b flavoured hadron to decay to a J/psi is BR(b --> J/psi X) = (1.21 +/- 0.13 (stat.) +/- 0.08 (syst.))%, and the average b hadron lifetime in the events tagged with a J/psi is tau(b) = 1.35(-0.17)+0.19 +/- 0.05 ps. Five events are observed consistent with the exclusive decay B+/- --> J/psiK+/- and from these events the exclusive branching fraction is measured to be BR(B+/- --> J/psiK+/-) = (0.22 +/- 0.10 +/- 0.02)%. Upper limits for other exclusive branching ratios are given.

D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1992). Measurements of Mean Lifetime and Branching Fractions of B Hadrons Decaying To J/psi. PHYSICS LETTERS. SECTION B, 295(3-4), 396-408 [10.1016/0370-2693(92)91581-S].

Measurements of Mean Lifetime and Branching Fractions of B Hadrons Decaying To J/psi

BOTTIGLI, UBALDO;CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1992-01-01

Abstract

From a data sample of 450000 hadronic events recorded with the ALEPH detector at LEP, 92 +/- 10 events are observed containing a J/psi meson decaying to mu+mu- or e+e-. From these data the measured inclusive branching fraction for a b flavoured hadron to decay to a J/psi is BR(b --> J/psi X) = (1.21 +/- 0.13 (stat.) +/- 0.08 (syst.))%, and the average b hadron lifetime in the events tagged with a J/psi is tau(b) = 1.35(-0.17)+0.19 +/- 0.05 ps. Five events are observed consistent with the exclusive decay B+/- --> J/psiK+/- and from these events the exclusive branching fraction is measured to be BR(B+/- --> J/psiK+/-) = (0.22 +/- 0.10 +/- 0.02)%. Upper limits for other exclusive branching ratios are given.
1992
D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1992). Measurements of Mean Lifetime and Branching Fractions of B Hadrons Decaying To J/psi. PHYSICS LETTERS. SECTION B, 295(3-4), 396-408 [10.1016/0370-2693(92)91581-S].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37081
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