A precise measurement of the B-d(0) 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 <(B-d(0))over bar> meson lifetime, based on the inclusive reconstruction of 3520 +/- 150 semileptonic decays of the type <(B-d(0))over bar> --> D*+ l <(nu(l))over bar>, has been performed, The result is: tau(B-d(0)) = 1.532 +/- 0.041(stat.) +/- 0.040(syst.)ps. The contribution to the systematic uncertainty which depends on external errors is +/-0.015.