Bs mixing parameters and lifetimes of B hadrons at D0

Abstract

Results from the D0 experiment using a luminosity of 1.3 fb-1 of data taken from June 2002 till March 2006 are shown. A measurement of the ΛB0 lifetime in the semileptonic decay channel ΛB0 → μν̄c+X is presented [1]. The result τ(Λb0) = 1.290 ±(stat.) ± (syst.) ps is consistent to another new measurement from D0 in the fully reconstructed decay channel ΛB0 → J/ψΛ. Also a measurement of the width difference δΓs and the CP-violation phase ϕs in the Bs mixing are shown [2]. Allowing CP-violation a simultaneous fit gives a result of δΓs = 0.17 and ϕ = s 0.79 ± 0.56.