The lifetimes of the 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 and B− mesons are partially reconstructed by identifying events containing a lepton with an associated D★+ or D0 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 D0ℓ− candidates yields the following results: , τB−=1.648±0.049±0.035 ps, .

Measurement of the anti B0 and B− meson lifetimes / R. Barate, D. Decamp, P. Ghez, C. Goy, J.-P. Lees, E. Merle, M.-N. Minard, B. Pietrzyk, S. Bravo, M.P. Casado, M. Chmeissani, J.M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll. Garrido, E. Graugés, M. Martinez, G. Merino, R. Miquel, Ll.M. Mir, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 492:(2000), pp. 275-287. [10.1016/S0370-2693(00)01093-5]

Measurement of the anti B0 and B− meson lifetimes

FOCARDI, ETTORE;CIULLI, VITALIANO;
2000

Abstract

The lifetimes of the 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 and B− mesons are partially reconstructed by identifying events containing a lepton with an associated D★+ or D0 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 D0ℓ− candidates yields the following results: , τB−=1.648±0.049±0.035 ps, .
2000
492
275
287
R. Barate;D. Decamp;P. Ghez;C. Goy;J.-P. Lees;E. Merle;M.-N. Minard;B. Pietrzyk;S. Bravo;M.P. Casado;M. Chmeissani;J.M. Crespo;E. Fernand...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/657237
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