Weak Decays of Doubly Heavy Baryons: \cal B_cc→ \cal B D^(*)

2020/10/31 by Run-Hui Li, Juan-Juan Hou, Bei He +1 · 3 citations
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1088/1674-1137/abe0bc

21 pages, 4 figures, 8 tables; Published version

arxiv created 2021/02/22 · arxiv updated 2021/02/23

Abstract

The discovery of Ξ_cc⁺⁺ has inspired new interest in studying doubly heavy baryons. In this study, the weak decays of a doubly charmed baryon \cal B_cc to a light baryon \cal B and a charm meson D^(*) (either a pseudoscalar or a vector one) are calculated. Following our previous work, we calculate the short distance contributions under the factorization hypothesis, whereas the long distance contributions are modeled as the final state interactions which are calculated with the one particle exchange model. We find that the \cal B_cc→ \cal B D^* decays' branching ratios are obviously larger, as they receive contributions of more polarization states. Among the decays that we investigate, the following have the largest branching fractions: \cal BR(Ξ_cc⁺⁺→Σ⁺D^*+) ∈ [0.46%, 3.33%] estimated with τ_Ξ_cc⁺⁺=256 fs; \cal BR(Ξ_cc⁺→ΛD^*+) ∈ [0.38%, 2.63%] and \cal BR(Ξ_cc⁺→Σ⁰ D^*+) ∈ [0.45%, 3.16%] with τ_Ξ_cc⁺=45 fs; and \cal BR(Ω_cc⁺→Ξ⁰ D^*+) ∈ [0.27%, 1.03%], \cal BR(Ω_cc⁺→Ξ⁰ D⁺) ∈ [0.07%, 0.44%] and \cal BR(Ω_cc⁺→Σ⁰ D^*+) ∈ [0.06%, 0.45%] with τ_Ω_cc⁺=75 fs. By comparing the decay widths of pure color commensurate channels with those of pure bow-tie ones, we find that the bow-tie mechanism plays an important role in charm decays.

Cited by

• Semileptonic decays of doubly charmed or bottom baryons to single heavy baryons
• Multipole Moments of Double Heavy J^P = (3)/(2)⁺ Baryons
• Observation of the doubly-charmed-baryon decay \it Ξ_cc⁺⁺→\it Ξ_c⁰π⁺π⁺