The lifetimes of the (B)over-bar-0 and B- mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of (B)over-bar-0 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 D0 l- candidates, combined with a constraint on the lifetime ratio (tau-/tau0) arising from the relative rates of observed D*+l- and D0l- events, yielded the following lifetimes: tau0 = 1.52(+0.20/-0.18)(stat.)+0.00/-0.13 (syst.) ps, tau = 1.47 +(+0.22/-0.19) (stat.) + (0.15/-0.14) (syst.) ps, tau-/tau0 = 0.96 + (+0.19/-0.15) (stat. ) + (+0.18/-0.12)(syst.).

D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1993). Measurement of the (B)over-bar-0 and B- meson Lifetimes. PHYSICS LETTERS. SECTION B, 307(1-2), 194-208 [10.1016/0370-2693(93)90211-Y].

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

BOTTIGLI, UBALDO;CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1993-01-01

Abstract

The lifetimes of the (B)over-bar-0 and B- mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of (B)over-bar-0 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 D0 l- candidates, combined with a constraint on the lifetime ratio (tau-/tau0) arising from the relative rates of observed D*+l- and D0l- events, yielded the following lifetimes: tau0 = 1.52(+0.20/-0.18)(stat.)+0.00/-0.13 (syst.) ps, tau = 1.47 +(+0.22/-0.19) (stat.) + (0.15/-0.14) (syst.) ps, tau-/tau0 = 0.96 + (+0.19/-0.15) (stat. ) + (+0.18/-0.12)(syst.).
1993
D., B., D., D., C., G., J. P., L., M. N., M., B., M., et al. (1993). Measurement of the (B)over-bar-0 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/11365/36531
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