Measurement of the Lambda_b lifetime using semileptonic decays

Abstract

We report a measurement of the Lambda_b lifetime using a sample corresponding to 1.3 fb${}^{-1}$ of data collected by the D0 experiment in 2002--2006 during Run II of the Fermilab Tevatron collider. The Lambda_b baryon is reconstructed via the decay Lambda_b -> mu nu Lambda_c X. Using $4437\pm 329$ signal candidates, we measure the Lambda_b lifetime to be $\tau (Lambd{a}_b)$ = 1.290^{+0.119}_{-0.110}(stat) ^{+0.087}_{-0.091} (syst) ps, which is among the most precise measurements in semileptonic Lambda_b decays. This result is in good agreement with the world average value.

submitted to Phys. Rev. Lett

References in corpus (1)

• Measurement of the Lambda_b lifetime in the exclusive decay Lambda_b to J/psi Lambda