The lifetimes of the (B) over bar (0) and B- mesons are measured using a sample of about four million hadronic Z decays collected from 1991 to 1995 with the ALEPH detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of (B) over bar (0) and B- mesons are partially reconstructed by identifying events containing a lepton with an associated D*(+) or D-0 meson, The proper time of the B meson is estimated from the measured decay length and the momentum of the D-lepton system. A fit to the proper time of 1880 D*(+)l(-) and 2856 D(0)l(-) candidates yields the following results: tau ((B) over bar0) = 1.518 +/- 0.053 +/- 0.034 ps, tau (B-) = 1.648 +/- 0.049 +/- 0.035 ps, tau (B-)/tau ((B) over bar0) = 1.085 +/- 0.059 +/- 0.018. (C) 2000 Elsevier Science B.V. All rights reserved.

Measurement of the (B)over-bar(0) and B- meson lifetimes / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 492:3-4(2000), pp. 275-287. [10.1016/S0370-2693(00)01093-5]

Measurement of the (B)over-bar(0) and B- meson lifetimes

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2000

Abstract

The lifetimes of the (B) over bar (0) and B- mesons are measured using a sample of about four million hadronic Z decays collected from 1991 to 1995 with the ALEPH detector at LEP. The data sample has been recently reprocessed, achieving a substantial improvement in the tracking performance. Semileptonic decays of (B) over bar (0) and B- mesons are partially reconstructed by identifying events containing a lepton with an associated D*(+) or D-0 meson, The proper time of the B meson is estimated from the measured decay length and the momentum of the D-lepton system. A fit to the proper time of 1880 D*(+)l(-) and 2856 D(0)l(-) candidates yields the following results: tau ((B) over bar0) = 1.518 +/- 0.053 +/- 0.034 ps, tau (B-) = 1.648 +/- 0.049 +/- 0.035 ps, tau (B-)/tau ((B) over bar0) = 1.085 +/- 0.059 +/- 0.018. (C) 2000 Elsevier Science B.V. All rights reserved.
2000
https://www.sciencedirect.com/science/article/abs/pii/S0370269300010935
Measurement of the (B)over-bar(0) and B- meson lifetimes / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 492:3-4(2000), pp. 275-287. [10.1016/S0370-2693(00)01093-5]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/5064
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