Evidence for the decays of ${\Lambda }_c^{+}\to {\Sigma }^{+}\eta$ and ${\Sigma }^{+}{\eta }^{\prime }$

Abstract

We study the hadronic decays of ${\Lambda }_c^{+}$ to the final states ${\Sigma }^{+}\eta$ and ${\Sigma }^{+}{\eta }^{\prime }$, using an $e^{+}{e}^{-}$ annihilation data sample of 567 pb${}^{-1}$ taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays ${\Lambda }_c^{+}\to {\Sigma }^{+}\eta$ and ${\Sigma }^{+}{\eta }^{\prime }$ with statistical significance of $2.5\sigma$ and $3.2\sigma$, respectively. Normalizing to the reference decays ${\Lambda }_c^{+}\to {\Sigma }^{+}{\pi }^0$ and ${\Sigma }^{+}\omega$, we obtain the ratios of the branching fractions $\frac{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}\eta )}{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\pi }^0)}$ and $\frac{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime })}{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}\omega )}$ to be $0.35\pm 0.16\pm 0.03$ and $0.86\pm 0.34\pm 0.07$, respectively. The upper limits at the 90\% confidence level are set to be $\frac{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}\eta )}{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\pi }^0)}<0.58$ and $\frac{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime })}{\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}\omega )}<1.2$. Using BESIII measurements of the branching fractions of the reference decays, we determine $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}\eta )=(0.41\pm 0.19\pm 0.05)\%$ ($<0.68\%$) and $\mathcal{B}({\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime })=(1.34\pm 0.53\pm 0.21)\%$ ($<1.9\%$). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of ${\Lambda }_c^{+}\to {\Sigma }^{+}\eta$ is consistent with the previous measurement, and the branching fraction of ${\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime }$ is measured for the first time.

arXiv commentAccepted by Chin. Phys. C : Chin. Phys. C 43, 083002, (2019)

References in corpus (7)

• Design and Construction of the BESIII Detector
• Precision measurement of the integrated luminosity of the data taken by BESIII at center of mass energies between 3.810 GeV and 4.600 GeV
• Measurements of absolute hadronic branching fractions of ${\Lambda }_c^{+}$ baryon
• Cabibbo-allowed nonleptonic weak decays of charmed baryons
• Measurement of the center-of-mass energies at BESIII via the di-muon process
• Analysis of Two-Body Decays of Charmed Baryons Using the Quark-Diagram Scheme
• A Study of Weak Mesonic Decays of ${\Lambda }_c$ and ${\Xi }_c$ Baryons on the Basis of HQET Results

Cited by in corpus (8)

• Charmed Baryon Physics Circa 2021
• Study of the Standard Model with weak decays of charmed hadrons at BESIII
• Charmed baryon decays in $SU(3{)}_F$ symmetry
• Charmed Baryon Weak Decays with Vector Mesons
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to n{\pi }^{+}$
• Observations of the Cabibbo-Suppressed decays ${\Lambda }_c^{+}\to n{\pi }^{+}{\pi }^0$, $n{\pi }^{+}{\pi }^{-}{\pi }^{+}$ and the Cabibbo-Favored decay ${\Lambda }_c^{+}\to n{K}^{-}{\pi }^{+}{\pi }^{+}$
• Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay ${\Lambda }_c^{+}\to p{\eta }^{\prime }$
• Measurements of branching fractions of ${\Lambda }_c^{+}\to {\Sigma }^{+}\eta$ and ${\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime }$ and asymmetry parameters of ${\Lambda }_c^{+}\to {\Sigma }^{+}{\pi }^0$, ${\Lambda }_c^{+}\to {\Sigma }^{+}\eta$, and ${\Lambda }_c^{+}\to {\Sigma }^{+}{\eta }^{\prime }$