Measurement of the anti-B0 and B- meson lifetimes

ALEPH Collaboration (1993) Measurement of the anti-B0 and B- meson lifetimes. Physics Letters B, 307 (1-2). pp. 194-208. ISSN 0370-2693

Abstract

The lifetimes of the and B− mesons have been measured with the ALEPH detector at LEP. Semileptonic decays of and B− mesons were partially reconstructed by identifying events containing a lepton with an associated 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 () arising from the relative rates of observed D∗+ℓ− and D0ℓ− events, yielded the following lifetimes: .