Precision measurement of the ${\Xi }_b^0$ baryon lifetime

Abstract

A sample of $pp$ collision data, corresponding to an integrated luminosity of 5.4 fb${}^{-1}$ and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the ${\Xi }_b^0$ baryon to that of the ${\Lambda }_b^0$ baryon, $r_{\tau }\equiv {\tau }_{{\Xi }_b^0}/{\tau }_{{\Lambda }_b^0}$. The value $r_{\tau }^{\mathrm{Run}2}=1.004\pm 0.009\pm 0.006$ is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain $r_{\tau }=1.004\pm 0.008\pm 0.005$. Multiplying by the known value of the ${\Lambda }_b^0$ lifetime yields ${\tau }_{{\Xi }_b^0}=1.475\pm 0.012\pm 0.008\pm 0.009\mathrm{ps}$, where the last uncertainty is due to the limited knowledge of the ${\Lambda }_b^0$ lifetime. This measurement improves the precision of the current world average of the ${\Xi }_b^0$ lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.

arXiv comment12 pages, 5 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/4483 (LHCb public pages)

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