Weak decays of doubly heavy baryons:Bcc→BD* |
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引用本文: | 李润辉,候娟娟,贺蓓,王雅茹.Weak decays of doubly heavy baryons:Bcc→BD*[J].中国物理C(英文版),2021(4):130-152. |
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作者姓名: | 李润辉 候娟娟 贺蓓 王雅茹 |
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作者单位: | School of physical Science and Technology |
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基金项目: | National Natural Science Foundation of China(11765012,12075126)。 |
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摘 要: | The discovery of Ξcc++has inspired new interest in studying doubly heavy baryons.In this study,the weak decays of a doubly charmed baryon Bccto 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:BR(Ξcc++→∑+D*+)∈0.46%,3.33%]estimated with τΞcc++=256 fs;BR(Ξcc+→AD*+)∈0.38%,2.63%]and BR(Ξcc+→∑0D*+)∈0.45%,3.16%]with τΞcc++=45 fs;and BR(Ωcc+→Ξ0D+)∈0.27%,1.03%),BR(Ωcc+→∑0D*+)∈0.07%,0.44%],and BR(Ωcc+→∑0D*+)∈0.06%,0.45%] with τ_(Ωcc)+=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.
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关 键 词: | doubly charmed baryon branching fraction final state interaction |
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