Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay $\Lambda^{+}_{c}\to p\eta^{\prime}$

TL;DR

This paper reports the first evidence and measurement of the absolute branching fraction of the rare decay $oldsymbol{ ext{Lambda}_c^+ o p oldsymbol{ exteta}'}$, using electron-positron collision data collected at BESIII.

Contribution

It provides the first measurement of the absolute branching fraction of the singly Cabibbo suppressed decay $ ext{Lambda}_c^+ o p oldsymbol{ exteta}'$, with results consistent with previous Belle measurements.

Findings

Evidence for $ ext{Lambda}_c^+ o p oldsymbol{ exteta}'$ with 3.6$\sigma$ significance.

Measured branching fraction: $(5.62^{+2.46}_{-2.04} ext{(stat)} \pm 0.26) imes 10^{-4}$.

Results agree with Belle within 1$\sigma$ uncertainty.

Abstract

The singly Cabibbo suppressed decay $\Lambda^{+}_{c}\to p\eta^{\prime}$ is measured using 4.5 $\mathrm{fb}^{-1}$ of $e^+e^-$ collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for $\Lambda^{+}_{c}\to p\eta^{\prime}$ with a statistical significance of $3.6\sigma$ is reported with a double-tag approach. The $\Lambda^{+}_{c}\to p\eta^{\prime}$ absolute branching fraction is determined to be $(5.62^{+2.46}_{-2.04} \pm 0.26)\times 10^{-4}$, where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of $1\sigma$.