Weak decays of doubly heavy baryons: multi-body decay channels

Shi, Yu-Ji (Aff1, 0000 0004 0368 8293, INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China) ; Wang, Wei (Aff1, 0000 0004 0368 8293, INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China) ; Xing, Ye (Aff1, 0000 0004 0368 8293, INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China) ; Xu, Ji (Aff1, 0000 0004 0368 8293, INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, MOE Key Laboratory for Particle Physics, Astrophysics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China)

23 January 2018

Abstract: The newly-discovered Ξcc++ decays into the Λc+K-π+π+ , but the experimental data has indicated that this decay is not saturated by any two-body intermediate state. In this work, we analyze the multi-body weak decays of doubly heavy baryons Ξcc , Ωcc , Ξbc , Ωbc , Ξbb and Ωbb , in particular the three-body nonleptonic decays and four-body semileptonic decays. We classify various decay modes according to the quark-level transitions and present an estimate of the typical branching fractions for a few golden decay channels. Decay amplitudes are then parametrized in terms of a few SU(3) irreducible amplitudes. With these amplitudes, we find a number of relations for decay widths, which can be examined in future.


Published in: EPJC 78 (2018) 56
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-018-5532-7
License: CC-BY-3.0



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