Weak decays of doubly heavy baryons:B_(cc)→BD^(*)

作     者：Run-Hui Li Juan-Juan Hou Bei He Ya-Ru Wang 李润辉;候娟娟;贺蓓;王雅茹

作者机构：School of physical Science and TechnologyInner Mongolia UniversityHohhot 010021China 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2021年第45卷第4期

页      面：130-152页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(11765012 12075126) 

主　　题：doubly charmed baryon branching fraction final state interaction 

摘      要：The discovery of Ξ_(cc)^(++)has inspired new interest in studying doubly heavy *** this study,the weak decays of a doubly charmed baryon B_(cc)to a light baryon B and a charm meson D^(*)(either a pseudoscalar or a vector one)are *** 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 *** find that the B_(cc)→BD^(*)decays branching ratios are obviously larger,as they receive contributions of more polarization *** the decays that we investigate,the following have the largest branching fractions:BR(Ξ_(cc)^(++)→∑^(+)D^(*+))∈[0.46%,3.33%]estimated with τΞ_(cc)^(++)=256 fs;BR(Ξ_(cc)^(+)→AD^(*+))∈[0.38%,2.63%]and BR(Ξ_(cc)^(+)→∑^(0)D^(*+))∈[0.45%,3.16%]with τΞ_(cc)^(++)=45 fs;and BR(Ω_(cc)^(+)→Ξ^(0)D^(+))∈[0.27%,1.03%),BR(Ω_(cc)^(+)→∑^(0)D^(*+))∈[0.07%,0.44%],and BR(Ω_(cc)^(+)→∑^(0)D^(*+))∈[0.06%,0.45%] with τ_(Ω_(cc))^(+)=75 *** 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.