Study of heavy quark conserving weak decays in the quark model

Abstract

Within the framework of a constituent quark model, we investigate the heavy quark conserving weak decays of ${\Xi }_c$ and ${\Xi }_b$. This process involves elementary transitions of $us\to du$ or $s\to ud\bar{u}$ with the heavy quark as a spectator, while for the charmed baryon in the initial state it can also occur via $cs\to dc$ to conserve the heavy quark flavor in the weak decays. It shows that the heavy quark symmetry (HQS) plays an essential role in the processes where the heavy quark acts as a spectator. For the ${\Xi }_c$ decays, the dominance of the pole terms in the parity-conserving transitions is evident. This can naturally explain the sizeable branching ratio for ${\Xi }_c^0\to {\Lambda }_c{\pi }^{-}$ as recently reported by LHCb. The same mechanism predicts a large branching ratio for ${\Xi }_c^{+}\to {\Lambda }_c{\pi }^0$. In contrast, the decays of ${\Xi }_b$ will only go through the parity-violating processes because of the HQS. In addition, the branching ratios of the ${\Xi }_c^{+}\to {\Lambda }_c{\pi }^0$ and ${\Xi }_b^0\to {\Lambda }_b{\pi }^0$ processes are also predicted for the further experimental measurement.

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Cited by in corpus (14)

• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Charmed Baryon Physics Circa 2021
• Toward discovering the excited $\Omega$ baryons through nonleptonic weak decays of ${\Omega }_c$
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons
• Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons: an Update
• Charmonium decays of beauty baryons in the perturbative QCD approach
• Measurement of the ${\Lambda }_c^{+}$ lifetime
• Observation and branching fraction measurement of the decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Study of the nonleptonic decay ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ in the covariant confined quark model
• Doubly charmed baryon decays ${\Xi }_{cc}^{++}\to {\Xi }_c^{(\prime )+}{\pi }^{+}$ in the quark model
• Measurement of the branching fraction of ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ at Belle
• Revisiting heavy-flavor conserving weak decays of charmed baryons within the nonrelativistic quark model
• The nonleptonic decays of double-charmed baryon ${\Omega }_{cc}^{+}$ within the nonrelativistic quark model
• The nonleptonic decays ${\Xi }_{cc}^{++}\to {\Xi }_c^{(\prime )+}{\pi }^{+}$ within the nonrelativistic quark model