UvA-DARE ( Digital Academic Repository ) A precise measurement of the $ B ^ { 0 } _ { d } $ meson lifetime using a new technique

From data recorded by DELPHI between 1991 and 1994, which corresponds to 3.2 million hadronic Z 0 decays, a measurement of the Bd meson lifetime, based on the inclusive reconstruction of 3520 ± 150 semileptonic decays of the type Bd → D∗+ X ` ν`, has been performed. The result is: τ (Bd) = 1.532 ± 0.041(stat.)± 0.040(syst.)ps. The contribution to the systematic uncertainty which depends on external errors is ±0.015.