We report on a measurement of b-hadron lifetimes in the fully reconstructed decay modes B(+)-> J/psi K(+), B(0)-> J/psi K*(892)(0), B(0)-> J/psi K(s)(0), and Lambda(0)(b)-> J/psi Lambda(0) using data corresponding to an integrated luminosity of 4.3 fb(-1), collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are tau(B(+))=[1.639 +/- 0.009(stat)+/- 0.009(syst)]ps, tau(B(0))=[1.507 +/- 0.010(stat)+/- 0.008(syst)]ps, and tau(Lambda(0)(b))=[1.537 +/- 0.045(stat)+/- 0.014(syst)]ps. The lifetime ratios are tau(B(+))/tau(B(0))=[1.088 +/- 0.009(stat)+/- 0.004(syst)] and tau(Lambda(0)(b))/tau(B(0))=[1.020 +/- 0.030(stat)+/- 0.008(syst)]. These are the most precise determinations of these quantities from a single experiment.
Measurement of b Hadron Lifetimes in Exclusive Decays Containing a J/Psi in p(p)over-bar Collisions at root s=1.96 TeV RID G-1087-2011 RID E-4473-2011
DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2011-01-01
Abstract
We report on a measurement of b-hadron lifetimes in the fully reconstructed decay modes B(+)-> J/psi K(+), B(0)-> J/psi K*(892)(0), B(0)-> J/psi K(s)(0), and Lambda(0)(b)-> J/psi Lambda(0) using data corresponding to an integrated luminosity of 4.3 fb(-1), collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are tau(B(+))=[1.639 +/- 0.009(stat)+/- 0.009(syst)]ps, tau(B(0))=[1.507 +/- 0.010(stat)+/- 0.008(syst)]ps, and tau(Lambda(0)(b))=[1.537 +/- 0.045(stat)+/- 0.014(syst)]ps. The lifetime ratios are tau(B(+))/tau(B(0))=[1.088 +/- 0.009(stat)+/- 0.004(syst)] and tau(Lambda(0)(b))/tau(B(0))=[1.020 +/- 0.030(stat)+/- 0.008(syst)]. These are the most precise determinations of these quantities from a single experiment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
