Measurement of the mass and width of the ${\Lambda }_c(2625{)}^{+}$ and the branching ratios of ${\Lambda }_c(2625{)}^{+}\to {\Sigma }_c^0{\pi }^{+}$ and ${\Lambda }_c(2625{)}^{+}\to {\Sigma }_c^{++}{\pi }^{-}$

Abstract

Using the entire data sample of $980{\text{fb}}^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurement of the mass, width, and the relative branching ratios of the ${\Lambda }_c(2625{)}^{+}$ charmed baryon. The mass difference between ${\Lambda }_c(2625{)}^{+}$ and ${\Lambda }_c^{+}$ is measured to be $M({\Lambda }_c(2625{)}^{+})-M({\Lambda }_c^{+})=341.518\pm 0.006\pm 0.049\mathrm{MeV}/c^2$. The upper limit on the width is measured to be $\Gamma ({\Lambda }_c(2625{)}^{+})<0.52\mathrm{MeV}/{\text{c}}^2$ at 90\% credibility level. Based on a full Dalitz plot fit, branching ratios with respect to the mode ${\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-}$ are measured to be $\frac{\mathcal{B}({\Lambda }_c(2625{)}^{+}\to {\Sigma }_c^0{\pi }^{+})}{\mathcal{B}({\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-})}=(5.19\pm 0.23\pm 0.40)\%$ and $\frac{\mathcal{B}({\Lambda }_c(2625{)}^{+}\to {\Sigma }_c^{++}{\pi }^{-})}{\mathcal{B}({\Lambda }_c(2625{)}^{+}\to {\Lambda }_c^{+}{\pi }^{+}{\pi }^{-})}=(5.13\pm 0.26\pm 0.32)\%$. These measurements can be used to further constrain the parameters of the underlying theoretical models.

References in corpus (7)

• The Belle II Core Software
• Measurements of the properties of Lambda_c(2595), Lambda_c(2625), Sigma_c(2455), and Sigma_c(2520) baryons
• B2BII - Data conversion from Belle to Belle II
• Relativistic corrections to decays of heavy baryons in the quark model
• Strong Decays of observed ${\Lambda }_c$ Baryons in the ${}^3{P}_0$ Model
• Analysis of ${\Lambda }_c(2595)$, ${\Lambda }_c(2625)$, ${\Lambda }_b(5912)$, ${\Lambda }_b(5920)$ based on a chiral partner structure
• Three-Body Decay of ${\Lambda }_c^{\ast }(2595)$ and ${\Lambda }_c^{\ast }(2625)$ with the Inclusion of Direct Two-Pion Coupling

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