Measurement of the lifetimes of promptly produced ${\Omega }_c^0$ and ${\Xi }_c^0$ baryons

Abstract

A measurement of the lifetimes of the ${\Omega }_c^0$ and ${\Xi }_c^0$ baryons is reported using proton-proton collision data at a centre-of-mass energy of $13\text{ TeV}$, corresponding to an integrated luminosity of $5.4{\text{ fb}}^{-1}$ collected by the LHCb experiment. The ${\Omega }_c^0$ and ${\Xi }_c^0$ baryons are produced directly from proton interactions and reconstructed in the $p{K}^{-}{K}^{-}{\pi }^{+}$ final state. The ${\Omega }_c^0$ lifetime is measured to be $276.5\pm 13.4\pm 4.4\pm 0.7\text{ fs}$, and the ${\Xi }_c^0$ lifetime is measured to be $148.0\pm 2.3\pm 2.2\pm 0.2\text{ fs}$, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the $D^0$ lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter ${\Omega }_c^0$ lifetime, and provide the single most precise measurement of the ${\Omega }_c^0$ lifetime.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-021.html (LHCb public pages)

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• LHCb Detector Performance
• sPlot: a statistical tool to unfold data distributions
• TMVA - Toolkit for Multivariate Data Analysis
• The LHCb Trigger and its Performance in 2011
• The Rule of Discarding $1/N_c$ in Inclusive Weak Decays
• Design and performance of the LHCb trigger and full real-time reconstruction in Run 2 of the LHC
• Tesla : an application for real-time data analysis in High Energy Physics
• ReDecay: A novel approach to speed up the simulation at LHCb
• D-meson lifetimes within the heavy quark expansion
• The global covariance matrix of tracks fitted with a Kalman filter and an application in detector alignment
• B Decays and the Heavy-Quark Expansion
• A Phenomenological Analysis of Heavy Hadron Lifetimes
• Precision measurement of the ${\Lambda }_c^{+}$, ${\Xi }_c^{+}$ and ${\Xi }_c^0$ baryon lifetimes
• Alignment procedure of the LHCb Vertex Detector
• Fitting function for asymmetric peaks
• The QCD Perspective on Lifetimes of Heavy-Flavour Hadrons
• Lifetimes of Charmed Hadrons Revisited. Facts and fancy