Measurement of absolute branching fraction of the inclusive decay ${\Lambda }_c^{+}\to \Lambda +X$

Abstract

Based on an $e^{+}{e}^{-}$ collision data sample corresponding to an integrated luminosity of 567${\mathrm{pb}}^{-1}$ taken at the center-of-mass energy of $\sqrt{s}=4.6$ GeV with the BESIII detector, we measure the absolute branching fraction of the inclusive decay ${\Lambda }_c^{+}\to \Lambda +X$ to be $\mathcal{B}({\Lambda }_c^{+}\to \Lambda +X)=(38.2_{-2.2}^{+2.8}\pm 0.8)\%$ using the double-tag method, where $X$ refers to any possible final state particles. In addition, we search for direct CP violation in the charge asymmetry of this inclusive decay for the first time, and obtain ${\mathcal{A}}_{CP}\equiv \frac{\mathcal{B}({\Lambda }_c^{+}\to \Lambda +X)-\mathcal{B}({\bar{\Lambda }}_c^{-}\to \bar{\Lambda }+X)}{\mathcal{B}({\Lambda }_c^{+}\to \Lambda +X)+\mathcal{B}({\bar{\Lambda }}_c^{-}\to \bar{\Lambda }+X)}=(2.1_{-6.6}^{+7.0}\pm 1.4)\%$, a statistically limited result with no evidence of CP violation.

arXiv comment8 pages, 2 figures

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Cited by in corpus (19)

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• Singly Cabibbo suppressed decays of ${\Lambda }_c^{+}$ with SU(3) flavor symmetry
• Measurements of the branching fractions of the semileptonic decays ${\Xi }_c^0\to {\Xi }^{-}{\ell }^{+}{\nu }_{\ell }$ and the asymmetry parameter of ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$
• Measurements of Weak Decay Asymmetries of ${\Lambda }_c^{+}\to p{K}_S^0$, $\Lambda {\pi }^{+}$, ${\Sigma }^{+}{\pi }^0$, and ${\Sigma }^0{\pi }^{+}$
• Revisiting semileptonic decays of ${\Lambda }_{b(c)}$ supported by baryon spectroscopy
• Charmed baryon decays in $SU(3{)}_F$ symmetry
• Charmed Baryon Weak Decays with Decuplet Baryon and SU(3) Flavor Symmetry
• Charmed Baryon Weak Decays with Vector Mesons
• Observation of a near-threshold enhancement in the $\Lambda \bar{\Lambda }$ mass spectrum from $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ at $\sqrt{s}$ from 3.51 to 4.60 GeV
• Measurement of the absolute branching fractions of ${\Lambda }_c^{+}\to \Lambda \eta {\pi }^{+}$ and $\Sigma (1385{)}^{+}\eta$
• An overview of ${\Lambda }_c$ decays
• First Measurement of the Decay Asymmetry in the pure W-boson-exchange Decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$
• Determination of the ${\Lambda }_c^{+}$ spin via the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• Measurement of $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }\eta$ from 3.5106 to 4.6988 GeV and study of $\Lambda \bar{\Lambda }$ mass threshold enhancement
• Addendum to "Overview of ${\Lambda }_c$ decays''
• Measurement of the branching fractions of the decays ${\Lambda }_c^{+}\to \Lambda K_S^0{K}^{+}$, ${\Lambda }_c^{+}\to \Lambda K_S^0{\pi }^{+}$ and ${\Lambda }_c^{+}\to \Lambda K^{\ast +}$
• Measurement of the absolute branching fraction of the three-body decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}{\pi }^0$ and search for ${\Lambda }_c^{+}\to n{K}^{+}{\pi }^0$, ${\Sigma }^0{K}^{+}{\pi }^0$ and $\Lambda K^{+}{\pi }^0$