Measurement of the $\Lambda_c^+$ lifetime

TL;DR

This paper reports the most precise measurement of the $mbda_c^+$ baryon lifetime using data from the Belle II experiment, achieving high accuracy and confirming previous results.

Contribution

First absolute measurement of the $mbda_c^+$ lifetime using Belle II data with unprecedented precision.

Findings

Measured $mbda_c^+$ lifetime as 203.20 fs with high precision.

Result is consistent with previous measurements.

Provides the most accurate lifetime measurement to date.

Abstract

An absolute measurement of the $\Lambda^{+}_c$ lifetime is reported using $\Lambda_c^+\rightarrow pK^-\pi^+$ 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 $\Upsilon(4S)$ 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.