A novel measurement of $B^0_s$ and $D^-_s$ lifetimes using semileptonic decays at LHCb

TL;DR

This paper presents a new measurement technique at LHCb that significantly improves the precision of heavy meson lifetime measurements using semileptonic decays, achieving world-leading results.

Contribution

It introduces a novel approach that overcomes previous limitations in reconstructing semileptonic decays for precise lifetime measurements.

Findings

15% improvement in $B^0_s$ lifetime measurement

Twofold improvement in $D^-_s$ lifetime measurement

Achieved world-leading precision in heavy meson lifetimes

Abstract

I report new, world-leading LHCb results on heavy meson lifetimes. We use a novel approach that suppresses the shortcomings typically associated with reconstruction of semileptonic decays, allowing for precise measurements of lifetimes and other properties in collider experiments. We achieve a 15% and a $2\times$ improvement over current best determinations of the flavor-specific $B^0_s$ lifetime and $D^-_s$ lifetime, respectively.