The lifetimes of the B0 and B- mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of B0 and B- mesons were partially reconstructed by identifying events containing a lepton with an associated D*+ or D0 meson. The proper time of the B meson was estimated from the measured decay length and the momentum and mass of the D-lepton system. A fit to the proper time of 77 D*+ℓ- and 77 D0ℓ- candidates, combined with a constraint on the lifetime ratio ( τ- τ0) arising from the relative rates of observed D*+ℓ- and D0ℓ- events, yielded the following lifetimes: τ0=1.52-0.18 +0.20(stat.)-0.13 +0.07(syst.) ps, τ- = 1.47-0.19 +0.22(stat.)-0.14 +0.15 (syst.) ps, τ- τ0 = 0.96-0.15 +0.19(stat.)-0.12 +0.18 (syst.).

Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the B0 and B- meson lifetimes. PHYSICS LETTERS. SECTION B, 307(1-2), 194-208 [10.1016/0370-2693(93)90211-Y].

Measurement of the B0 and B- meson lifetimes

CARPINELLI, Massimo;
1993

Abstract

The lifetimes of the B0 and B- mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of B0 and B- mesons were partially reconstructed by identifying events containing a lepton with an associated D*+ or D0 meson. The proper time of the B meson was estimated from the measured decay length and the momentum and mass of the D-lepton system. A fit to the proper time of 77 D*+ℓ- and 77 D0ℓ- candidates, combined with a constraint on the lifetime ratio ( τ- τ0) arising from the relative rates of observed D*+ℓ- and D0ℓ- events, yielded the following lifetimes: τ0=1.52-0.18 +0.20(stat.)-0.13 +0.07(syst.) ps, τ- = 1.47-0.19 +0.22(stat.)-0.14 +0.15 (syst.) ps, τ- τ0 = 0.96-0.15 +0.19(stat.)-0.12 +0.18 (syst.).
Articolo in rivista - Articolo scientifico
DECAYS
English
1993
194
208
15
Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1993). Measurement of the B0 and B- meson lifetimes. PHYSICS LETTERS. SECTION B, 307(1-2), 194-208 [10.1016/0370-2693(93)90211-Y].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390426
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