Measurement Of The Lifetime Of The B_c~± Meson In The Semileptonic Decay Channel

摘要

Using approximately 1.3 fb~(-1)of data collected by the DO detector between 2002 and 2006, we measure the lifetime of the B_c~± meson in the B_c~± →J/ψμ~± + X final state. A simultaneous unbinned likelihood fit to the J/ψ + μ invariant mass and lifetime distributions yields a signal of 881 ± 80(stat) candidates and a lifetime measurement of (τ)(B_c~±) = 0.448_(-0.036)~(+0.038)(stat) ± 0.032(syst) ps.