The lifetimes of the B0 and B+ mesons have been measured with the ALEPH detector at LEP, using approximately 3 million hadronic Z decays collected in the period 1991-1994. In the first of three methods, semileptonic decays of B0 and B+ mesons were partially reconstructed by identifying events containing a lepton with an associated D*- or D̄0 meson. The second method used fully reconstructed B0 and B+ mesons. The third method, used to measure the B0 lifetime, employed a partial reconstruction technique to identify B0 → D*-π+X decays. The combined results are τ0 = 1.55 ± 0.06 ± 0.03 ps, τ+ = 1.58 ± 0.09 ± 0.03 ps, τ+/τ0 = 1.03 ± 0.08 ± 0.02. © Springer-Verlag 1996.
Improved measurement of theB 0 andB + meson lifetimes
Colaleo, A.;Girone, M.;Iaselli, G.;Nuzzo, S.;Selvaggi, G.;Zito, G.;Huang, X.;Zhang, J.;Cattaneo, M.;Antonelli, A.;Smith, K.;Jacquet, M.;Bozzi, C.;Ferrante, I.;Spagnolo, P.;
1996-01-01
Abstract
The lifetimes of the B0 and B+ mesons have been measured with the ALEPH detector at LEP, using approximately 3 million hadronic Z decays collected in the period 1991-1994. In the first of three methods, semileptonic decays of B0 and B+ mesons were partially reconstructed by identifying events containing a lepton with an associated D*- or D̄0 meson. The second method used fully reconstructed B0 and B+ mesons. The third method, used to measure the B0 lifetime, employed a partial reconstruction technique to identify B0 → D*-π+X decays. The combined results are τ0 = 1.55 ± 0.06 ± 0.03 ps, τ+ = 1.58 ± 0.09 ± 0.03 ps, τ+/τ0 = 1.03 ± 0.08 ± 0.02. © Springer-Verlag 1996.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


