First observation and branching fraction measurement of the $\Lambda_b^0\to D_s^- p$ decay

TL;DR

This paper reports the first observation of the decay mbda_b^0_s^- p and measures its branching fraction using LHCb data at 13 TeV, providing new insights into baryon decay processes.

Contribution

It presents the first observation of the mbda_b^0_s^- p decay and measures its branching fraction with detailed uncertainty analysis.

Findings

First observation of mbda_b^0_s^- p decay

Branching fraction measured as (12.6 1 0.5 1 0.3 1 1.2) imes 10^{-6}

Results enhance understanding of baryon decay channels.

Abstract

The first observation of the $\Lambda_b^0\to D_s^- p$ decay is presented using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of ${\sqrt{s}=13 \,\textrm{TeV}}$, corresponding to a total integrated luminosity of $6\,\textrm{fb}^{-1}$. Using the $\Lambda_b^0\to\Lambda_c^+\pi^-$ decay as the normalisation mode, the branching fraction of the $\Lambda_b^0\to D_s^- p$ decay is measured to be ${\mathcal{B}(\Lambda_b^0\to D_s^- p)=(12.6 \pm 0.5 \pm 0.3 \pm 1.2 )\times 10^{-6}}$, where the first uncertainty is statistical, the second systematic and the third due to uncertainties in the branching fractions of the $\Lambda_b^0\to\Lambda_c^+\pi^-$, $D_s^- \to K^-K^+\pi^-$ and $\Lambda_c^+\to p K^- \pi^+$ decays.