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

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 Ξ cc, Ω cc, Ξ bc, Ω bc, Ξ bb and Ω bb, 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.