Weak Decays of Antitriplet Charmed Baryons from the Perspective of Flavor Symmetry

Abstract

In this work, we carry out a global fitting for the two-body weak decays of antitriplet charmed baryons in both SU(3) respected and broken scenarios incorporating all the available data up to date. In the SU(3) irreducible representation approach (IRA), more amplitudes for irreducible representation terms are taken into account and the ranges for their coefficients in each scenarios are predicted. By a comparison among various fitting schemes in this work, experimental data prefer the SU(3) symmetry breaking scenario. Observables of interest, branching fractions and decay asymmetries of all the Cabibbo-favored (CF), singly Cabibbo-suppresed (SCS) and doubly Cabibbo-suppressed (DCS) channels are calculated in the chosen fitting scheme. Most of our predictions are consistent well with experimental data. We further propose more ways to explore the SU(3) symmetry in charmed baryon decays. An improved measurement for $\alpha ({\Lambda }_c^{+}\to p{K}_S)$ is called for since predictions from both fittings, including the one in current work and earlier works, and the pole model calculation prefer an opposite sign from previous experimental value. Given branching fractions of most of the CF modes and part of the SCS modes being measured, predictions for the remaining channels, including the DCS modes as well as more decay asymmetries, are anticipated to be checked by the upcoming experiments in BESIII, Belle/Belle-II and LHCb.

20 pages, 10 tables; accepted version for JHEP

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Cited by in corpus (13)

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• Measurement of the branching fractions of the singly Cabibbo-suppressed decays ${\Lambda }_c^{+}\to p\eta$ and ${\Lambda }_c^{+}\to p\omega$
• Evidence of the Singly Cabibbo Suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$
• Measurements of the branching fractions of ${\Xi }_c^0\to {\Xi }^0{\pi }^0$, ${\Xi }_c^0\to {\Xi }^0\eta$, and ${\Xi }_c^0\to {\Xi }^0{\eta }^{\prime }$ and asymmetry parameter of ${\Xi }_c^0\to {\Xi }^0{\pi }^0$
• A novel method for searching the ${\Xi }_c^{0/+}$-${\Xi }_c^{\prime 0/+}$ mixing effect in the angular distribution analysis of a four-body ${\Xi }_c^{0/+}$ decay
• Topological $SU(3{)}_f$ approach for two-body ${\Omega }_c$ weak decays
• Observations of the singly Cabibbo-suppressed decays ${\Xi }_c^{+}\to p{K}_S^0$, ${\Xi }_c^{+}\to \Lambda {\pi }^{+}$, and ${\Xi }_c^{+}\to {\Sigma }^0{\pi }^{+}$ at Belle and Belle II
• Large CP violation in charmed baryon decays
• First measurements of the branching fractions for the decay modes ${\Xi }_c^0\to \Lambda \eta$ and ${\Xi }_c^0\to \Lambda {\eta }^{\prime }$ and search for the decay ${\Xi }_c^0\to \Lambda {\pi }^0$ using Belle and Belle II data
• Revisiting heavy-flavor conserving weak decays of charmed baryons within the nonrelativistic quark model
• Measurements of the branching fractions of ${\Xi }_c^{+}\to {\Sigma }^{+}{K}_S^0$, ${\Xi }_c^{+}\to {\Xi }^0{\pi }^{+}$, and ${\Xi }_c^{+}\to {\Xi }^0{K}^{+}$ at Belle and Belle II