Top-quark rare decays with flavor violation  

作　　者：Ming-Yue Liu Shu-Min Zhao Song Gao Xing-Yu Han Tai-Fu Feng 刘明月;赵树民;高松;韩星宇;冯太傅(Department of Physics,Hebei University,Baoding 071002,China;Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory,Baoding 071002,China;Hebei Research Center of the Basic Discipline for Computational Physics,Baoding 071002,China;Department of Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]Department of Physics,Hebei University,Baoding 071002,China [2]Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory,Baoding 071002,China [3]Hebei Research Center of the Basic Discipline for Computational Physics,Baoding 071002,China [4]Department of Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics C》2024年第9期68-81,共14页中国物理C（英文版）

基　　金：supported by the National Natural Science Foundation of China(12075074);the Natural Science Foundation of Hebei Province,China(A2020201002,A2022201022,A2022201017,A2023201040);the Natural Science Foundation of Hebei Education Department,China(QN2022173);the Postgraduate's Innovation Fund Project of Hebei University(HBU2024SS042);the Youth Top-notch Talent Support Program of the Hebei Province,China。

摘　　要：In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→ch.They are extremely rare processes in the standard model(SM).As the U(1)extension of the minimal supersymmetric standard model(MSSM),the U(1)_X SSM features new superfields such as the right-handed neutrinos and three Higgs singlets.We analyzed the effects of different sensitive parameters on the results and made reasonable theoretical predictions,thereby providing a useful reference for future experimental development.Considering the constraint set by the updated experimental data,the numerical results show that the branching ratios of the four proccsscs,i.e.,t→cγ,cg,cZ,ch,can reach the same order of magnitude as their experimental upper limits.Among them,tanβhas the most evident effect on these processes and is the main parameter;g_(X),g_(YX),μ,M_(2),λ_(H),M_(U23)^(2),and M_(Q23)^(2) are also important parameters for the processes,and have effects on the numerical results.

关 键 词：Top quark flavor violation U(1)_(X)SSM new physics 

分 类 号：O572.33[理学—粒子物理与原子核物理]