Measurements of Absolute Branching Fractions for $\Lambda^+_c\to\Xi^0K^+$ and $\Xi(1530)^0K^+$

TL;DR

This paper presents the first absolute measurements of specific decay processes of the Lambda_c+ baryon, providing more precise data than previous relative measurements using the BESIII detector.

Contribution

First absolute measurements of the branching fractions for Lambda_c+ decays to Xi0K+ and Xi(1530)0K+ using the double-tag technique at BESIII.

Findings

Branching fraction for Lambda_c+ to Xi0K+ is (5.90±0.86±0.39)×10^{-3}.

Branching fraction for Lambda_c+ to Xi(1530)0K+ is (5.02±0.99±0.31)×10^{-3}.

Results are more precise than previous relative measurements.

Abstract

We report the first measurements of absolute branching fractions for the $W$-exchange-only processes $\Lambda^+_c\to\Xi^0K^+$ and $\Lambda^+_c\to\Xi(1530)^0K^+$ with the double-tag technique, by analyzing an $e^{+}e^{-}$ collision data sample, that corresponds to an integrated luminosity of 567 pb$^{-1}$ collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be $\mathcal{B}(\Lambda^+_c\to\Xi^0K^+)=(5.90\pm0.86\pm0.39)\times10^{-3}$ and $\mathcal{B}(\Lambda^+_c\to\Xi(1530)^0K^+)=(5.02\pm0.99\pm0.31)\times10^{-3}$, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.