Measurement of the lifetime of the doubly charmed baryon $\Xi_{cc}^{++}$

TL;DR

This paper reports the first measurement of the lifetime of the doubly charmed baryon $\\Xi_{cc}^{++}$, using data from the LHCb experiment, providing a key parameter for understanding heavy baryon properties.

Contribution

The paper presents the first experimental measurement of the $\\Xi_{cc}^{++}$ baryon lifetime, utilizing a novel reconstruction method in proton-proton collision data.

Findings

Measured lifetime of $0.256^{+0.024}_{-0.022} \,\mathrm{ps}$

Data collected with 1.7 fb$^{-1}$ at 13 TeV

First lifetime measurement of this baryon

Abstract

The first measurement of the lifetime of the doubly charmed baryon $\Xi_{cc}^{++}$ is presented, with the signal reconstructed in the final state $\Lambda_c^+ K^- \pi^+ \pi^+$. The data sample used corresponds to an integrated luminosity of $1.7\,\mathrm{fb}^{-1}$, collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$. The $\Xi_{cc}^{++}$ lifetime is measured to be $0.256\,^{+0.024}_{-0.022}{\,\rm (stat)\,} \pm 0.014 {\,\rm(syst)}\mathrm{\,ps}$.