Measurement of the ${\Lambda }_c^{+}$ lifetime

Abstract

An absolute measurement of the ${\Lambda }_c^{+}$ lifetime is reported using ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ decays in events reconstructed from data collected by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. The total integrated luminosity of the data sample, which was collected at center-of-mass energies at or near the ${\rm Y}(4S)$ resonance, is $207.2~\mbox{fb}^{-1}$. The result, $\tau ({\Lambda }_c^{+})=203.20\pm 0.89(\mathrm{stat})\pm 0.77(\mathrm{syst})$ fs, is the most precise measurement to date and is consistent with previous determinations.

arXiv commentAccepted for publication in PRL

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