From a data sample of 450 000 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/psiX) = (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.

Measurements of mean lifetime and branching fractions of b hadrons decaying to J/ψ / Buskulic, D., Decamp, D., Goy, C., Lees, J.-P., Minard, M.-N., Mours, B., Alemany, R., Ariztizabal, F., Comas, P., Crespo, J.M., Delfino, M., Fernandez, E., Gaitan, V., Garrido, Ll., Pacheco, A., Pascual, A., Creanza, D., de Palma, M., Farilla, A., Iaselli, G., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 295:3-4(1992), pp. 396-408. [10.1016/0370-2693(92)91581-S]

Measurements of mean lifetime and branching fractions of b hadrons decaying to J/ψ

Creanza, D.;Iaselli, G.;Maggi, G.;
1992

Abstract

From a data sample of 450 000 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/psiX) = (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
Measurements of mean lifetime and branching fractions of b hadrons decaying to J/ψ / Buskulic, D., Decamp, D., Goy, C., Lees, J.-P., Minard, M.-N., Mours, B., Alemany, R., Ariztizabal, F., Comas, P., Crespo, J.M., Delfino, M., Fernandez, E., Gaitan, V., Garrido, Ll., Pacheco, A., Pascual, A., Creanza, D., de Palma, M., Farilla, A., Iaselli, G., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 295:3-4(1992), pp. 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/11589/1175
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