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

The singly Cabibbo suppressed decay ${\mathrm{\Lambda }}_c^{+}\to p{\eta }^{\mathrm{\prime }}$ is measured using 4.5 ${\mathrm{f}\mathrm{b}}^{-1}$ 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 ${\mathrm{\Lambda }}_c^{+}\to p{\eta }^{\mathrm{\prime }}$ with a statistical significance of $3.6\sigma$ is reported with a double-tag approach. The ${\mathrm{\Lambda }}_c^{+}\to p{\eta }^{\mathrm{\prime }}$ absolute branching fraction is determined to be $(5.62_{-2.04}^{+2.46}\pm 0.26)\times {10}^{-4}$, 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 $1\sigma$.