Measurement of the Lambda_b lifetime using semileptonic decays

TL;DR

This paper reports a precise measurement of the Lambda_b baryon lifetime using semileptonic decay data from the D0 experiment, contributing to the understanding of heavy baryon properties.

Contribution

The study provides one of the most precise Lambda_b lifetime measurements in semileptonic decays, utilizing a large dataset from Fermilab's Tevatron collider.

Findings

Lambda_b lifetime measured as 1.290 ps with uncertainties.

Result agrees with the world average.

Utilized 4437 signal candidates for analysis.

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 $\tau(Lambda_b)$ = 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.