Lifetime measurements in $b$-hadron decays at LHCb

TL;DR

This paper reports precise lifetime measurements of various b-hadrons using LHCb data, testing the Heavy Quark Expansion theory and providing insights into b-hadron decay properties.

Contribution

It presents new lifetime measurements of multiple b-hadrons and decay width differences, enhancing the experimental validation of theoretical models.

Findings

Measured lifetimes of B+, Λ_b^0, Ξ_b^-, Ξ_b^0, Ω_b^-

Determined effective lifetimes of B^0 and B_s^0

Measured decay width difference ΔΓ_d in B^0 system

Abstract

Precision lifetime measurements of $b$-flavoured hadrons are an important test of the validity of the theoretical tool used to determine $b$-hadrons observables, the Heavy Quark Expansion. Recent measurements of the $B^+$, $\Lambda^0_b$, $\Xi^-_b$, $\Xi^0_b$ and $\Omega^-_b$ hadrons lifetimes are reported. Moreover, several $B^0$ and $B^0_s$ effective lifetime measurements are discussed, as well as a measurement of the decay width difference in the $B^0$ system, $\Delta \Gamma_d$. All the measurements have been performed using $pp$ collision data collected with the LHCb detector.