Weak decays of doubly heavy baryons: Bcc →BD(*)

• 作者: Run-Hui Li Juan-Juan Hou Bei He Ya-Ru Wang
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 130-152
• 页数: 23页
• 语种: 英文
• DOI: 10.1088/1674-1137/abe0bc

摘要

The discovery of[(I)]++cc has inspired new interest in studying doubly heavy baryons.In this study,the weak decays of a doubly charmed baryon Bcc to a light baryon 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 Bcc → BD* 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:B'R([(I)]++cc → ∑+D*+) ∈[0.46％,3.33％]estimated with τ[(I)]++cc =256 fs;BR([(I)]++cc → ΛD*+) ∈[0.38％,2.63％]and BR([(I)]++cc → ∑0D*+) ∈[0.45％,3.16％]with τ[(I)]++cc=45 fs;and BR(Ω+cc →[(I)]0D*+) ∈[0.27％,1.03％],BR(Ω+cc →[(I)]0D+) ∈[0.07％,0.44％],and BR(Ω+cc → ∑0D*+) ∈[0.06％,0.45％]with τΩ+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.