Measurement of the branching fractions of the singly Cabibbo-suppressed decays Λc+→pη and Λc+→pω

Abstract

Based on 4.5 fb⁻¹e⁺e⁻ collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for ${\mathrm{\Lambda }}_c^{+}\to \mathit{p\eta }$ and ${\mathrm{\Lambda }}_c^{+}\to \mathit{p\omega }$ were measured by means of single-tag method. The branching fractions of ${\mathrm{\Lambda }}_c^{+}\to \mathit{p\eta }$ and ${\mathrm{\Lambda }}_c^{+}\to \mathit{p\omega }$ are determined to be (1.57 ± 0.11_stat± 0.04_syst) × 10⁻³ and (1.11 ± 0.20_stat± 0.07_syst) × 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 ${\mathrm{\Lambda }}_c^{+}\to \mathit{p\eta }$ is the most precise to date.