Measurement of b hadron lifetimes in exclusive decays containing a J/psi in p-pbar collisions at sqrt(s)=1.96TeV

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*, B^0 --> J/Psi Ks, and Lambda_b --> J/Psi Lambda using data corresponding to an integrated luminosity of 4.3 ${\mathrm{fb}}^{-1}$, collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are $\tau$B^+ = $1.639\pm 0.009(\mathrm{stat})\pm 0.009(\mathrm{syst})\mathrm{ps}$, $\tau$B^0 = $1.507\pm 0.010(\mathrm{stat})\pm 0.008(\mathrm{syst})\mathrm{ps}$ and $\tau$Lambda_b = $1.537\pm 0.045(\mathrm{stat})\pm 0.014(\mathrm{syst})\mathrm{ps}$. The lifetime ratios are $\tau$B^+/$\tau$B^0 = $1.088\pm 0.009(\mathrm{stat})\pm 0.004(\mathrm{syst})$ and $\tau$Lambda_b/$\tau$B^0 = $1.020\pm 0.030(\mathrm{stat})\pm 0.008(\mathrm{syst})$. These are the most precise determinations of these quantities from a single experiment.

revised version. accepted for PRL publication

References in corpus (1)

• Mixing and lifetimes of $b$-hadrons

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