Two Higgs Doublet Model Ⅲ and Double-Lepton Polarization Asymmetries in Λ_b →Λμ^+μ^- Decays  

作　　者：王帅伟 黄金书 王帅伟;黄金书(Institute of Particle Physics,Huazhong Normal University;Department of Physics,Nanyang Normal University)

机构地区：[1]Institute of Particle Physics,Huazhong Normal University [2]Department of Physics,Nanyang Normal University

出　　处：《Communications in Theoretical Physics》2016年第8期211-218,共8页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11345005;Key Scientific Research projects of Henan Educational Committee(13A140814);the National Science Foundation under Grant No.U1332103

摘　　要：Using the form factors calculated both in lattice QCD and HQET, we analyze the branching ratio, doublelepton polarization asymmetries and averaged double-lepton polarization asymmetries of Λ_b →Λμ^+μ^- decay in the2 HDM Ⅲ, respectively. Combining the experimental constrains on the 2HDM Ⅲ parameters, we take two set of representative parameter spaces in our calculations. For the branching ratio of Λ+b →Λμμ-decay, considering the uncertainties of the form factors and input parameters, we find the results of both SM and 2HDM Ⅲ can satisfy the current experimental data in the framework of lattice QCD, but not in HQET. Then we calculate the double-lepton polarization asymmetries Pij and their averaged values Pij, we find the double-lepton polarization asymmetries PLT,PNN, and PTT are sensitive to the 2HDM Ⅲ. However, PLN, PNL, PNT, and PTN show the opposite results. The contribution of the 2HDM Ⅲ to their averaged values have similar results.

关 键 词：decay of baryons 2HDM Ⅲ double-lepton polarization asymmetries 

分 类 号：O572.33[理学—粒子物理与原子核物理]