Evidence of the Singly Cabibbo Suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$

Abstract

Evidence for the singly Cabibbo suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$ is reported for the first time with a statistical significance of $3.7\sigma$ based on 6.0 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at the BEPCII collider. The absolute branching fraction of ${\Lambda }_c^{+}\to p{\pi }^0$ is measured to be $(1.56_{-0.58}^{+0.72}\pm 0.20)\times 10^{-4}$. Combining with the branching fraction of ${\Lambda }_c^{+}\to n{\pi }^{+}$, $(6.6\pm 1.3)\times 10^{-4}$, the ratio of the branching fractions of ${\Lambda }_c^{+}\to n{\pi }^{+}$ and ${\Lambda }_c^{+}\to p{\pi }^0$ is calculated to be $3.2_{-1.2}^{+2.2}$. As an important input for the theoretical models describing the decay mechanisms of charmed baryons, our result indicates that the non-factorizable contributions play an essential role and their interference with the factorizable contributions should not be significant. In addition, the absolute branching fraction of ${\Lambda }_c^{+}\to p\eta$ is measured to be $(1.63\pm 0.31_{\mathrm{stat}}\pm 0.11_{\mathrm{syst}})\times 10^{-3}$.

9 pages, 3 figures

References in corpus (8)

• Method for detector description transformation to Unity and application in BESIII
• Luminosities and energies of $e^{+}{e}^{-}$ collision data taken between $\sqrt{s}$=4.612 GeV and 4.946 GeV at BESIII
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Singly Cabibbo suppressed decays of ${\Lambda }_c^{+}$ with SU(3) flavor symmetry
• Weak Decays of Antitriplet Charmed Baryons from the Perspective of Flavor Symmetry
• Measurements of the branching fractions of ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p{\pi }^0$ decays at Belle
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to n{\pi }^{+}$
• Measurement of the branching fractions of the singly Cabibbo-suppressed decays ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p\omega$

Cited by in corpus (2)

• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to p{\pi }^0$