Measurement of the ${\Omega }_c^0$ and ${\Xi }_c^0$ baryon lifetimes using hadronic $b$-baryon decays

Abstract

The lifetimes of the ${\Omega }_c^0$ and ${\Xi }_c^0$ baryons are measured using a $pp$ collision dataset collected by the LHCb experiment, corresponding to an integrated luminosity of $9\mathrm{f}{\mathrm{b}}^{-1}$. The charm baryons are produced in the fully reconstructed decay chains ${\Omega }_b^{-}\to {\Omega }_c^0(\to p{K}^{-}{K}^{-}{\pi }^{+}){\pi }^{-}$ and ${\Xi }_b^{-}\to {\Xi }_c^0(\to p{K}^{-}{K}^{-}{\pi }^{+}){\pi }^{-}$. The measurement uses topologically and kinematically similar $B^{-}\to D^0(\to K^{-}{K}^{+}{\pi }^{-}{\pi }^{+}){\pi }^{-}$ decays for normalisation. The measured lifetimes are ${\tau }_{{\Omega }_c^0}=276.3\pm 19.4(\mathrm{stat})\pm 1.8(\mathrm{syst})\pm 0.7({\tau }_{{\mathrm{D}}^0})\mathrm{fs}$, ${\tau }_{{\Xi }_c^0}=149.2\pm 2.5(\mathrm{stat})\pm 0.9(\mathrm{syst})\pm 0.4({\tau }_{{\mathrm{D}}^0})\mathrm{fs}$, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the $D^0$ lifetime. These results are consistent with previous measurements performed by the LHCb experiment.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3875/ (LHCb public pages)

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