Measurement of the branching fractions of the singly Cabibbo-suppressed decays ${\Lambda }_{c}^{+}\to p\eta $ and ${\Lambda }_{c}^{+}\to p\omega $

Based on 4.5 fb −1 e + e − collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for ${\Lambda }_{c}^{+}\to \mathrm{p\eta }$ and ${\Lambda }_{c}^{+}\to \mathrm{p\omega }$ were measured by means of single-tag method. The branching fractions of ${\Lambda }_{c}^{+}\to \mathrm{p\eta }$ and ${\Lambda }_{c}^{+}\to \mathrm{p\omega }$ are determined to be (1.57 ± 0.11stat ± 0.04syst) × 10 −3 and (1.11 ± 0.20stat ± 0.07syst) × 10 −3, with a statistical significance of greater than 10σ and 5.7σ, respectively. These results are consistent with the previous measurements by BESIII, LHCb and Belle, and the result of ${\Lambda }_{c}^{+}\to \mathrm{p\eta }$ is the most precise to date.