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

The singly Cabibbo suppressed decay ${\Lambda }_{c}^{+}\to p{\eta }^{\prime }$ is measured using $4.5\text{}\text{}{\mathrm{fb}}^{-1}$ 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 $\left(5.6{2}_{-2.04}^{+2.46}±0.26\right)×{10}^{-4}$, 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 $.