B. Audurier — Page 24

arXiv2018

Measurement of the $Ω_c^0$ baryon lifetime

We report a measurement of the lifetime of the $Ω_c^0$ baryon using proton-proton collision data at center-of-mass energies of 7 and 8~TeV, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ collected by the LHCb experiment. The sample consists of about 1000 $Ω_b^-\toΩ_c^0μ^-\barν_μ X$ signal decays, where the $Ω_c^0$ baryon is detected in the $pK^-K^-π^+$ final state and $X$ represents possible additional undetected particles in the decay. The $Ω_c^0$ lifetime is measured to be $τ_{Ω_c^0} = 268\pm24\pm10\pm2$ fs, where the uncertainties are statistical, systematic, and from the uncertainty in the $D^+$ lifetime, respectively. This value is nearly four times larger than, and inconsistent with, the current world-average value.

hep-ex↗

arXiv2018

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

The first measurement of the lifetime of the doubly charmed baryon $Ξ_{cc}^{++}$ is presented, with the signal reconstructed in the final state $Λ_c^+ K^- π^+ π^+$. 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 $Ξ_{cc}^{++}$ lifetime is measured to be $0.256\,^{+0.024}_{-0.022}{\,\rm (stat)\,} \pm 0.014 {\,\rm(syst)}\mathrm{\,ps}$.

hep-ex↗