Measurement of the B meson lifetimes in fully hadronic decays at the CDF-II experiment.

摘要

We report the measurements of the B+, B0 and Bs meson lifetimes, performed analyzing a data sample of 360 pb-1 collected by the CDF-II detector in pp¯ collisions at s = 1.96 TeV. The lifetimes are extracted using the fully reconstructed hadronic decay modes B+ → D¯ 0pi+, B0 → D-pi+, Bs → D-s pi+ selected by a novel trigger based on displaced tracks.; Using a Monte Carlo approach to correct the effects of the trigger and selection cuts we measure ctB+ =498+/-8stat+/-4 .2systmm ctB0 =457+/-8stat+/-4 .2systmm ctBs =479+/-32stat+/- 4.7systmm. Results agree with the current world averages and theoretical predictions. In particular, the obtained Bs meson lifetime measurement is one of the most precise measurements of this quantity available at the moment and the best one using a single decay channel.