Bs（d）0-■s（d）0 Mixing and New Physics Effects in a Top Quark Two-Higgs Doublet Model

作     者：Lü Lin-Xia~(1,2,+) XIAO Zhen-Jun~(1,++)1 Department of Physics and Institute of Theoretical Physics,Nanjing Normal University,Nanjing 210097,China2 Department of Physics,Nanyang Teacher's College,Nanyang 473061,China 

出 版 物：《Communications in Theoretical Physics》 (理论物理)

年 卷 期：2007年第47卷第6期

页      面：1099-1105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：The project partly supported by National Natural Science Foundation of China under Grant No.10575052 the Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP)under Grant No.20050319008 

主　　题：B meson mixing new physics effects two-Higgs-doublet model 

摘      要：We calculate the new physics contributions to the neutral Bd0and Bs0meson mass splitting △Mdand △Msinduced by the box diagrams involving the charged-Higgs bosons in the top quark two-Higgs doublet model（T2HDM）.Using the precision data,we obtain the bounds on the parameter space of the T2HDM:（a）For fixed MH=400 GeVand δ=[0°,60°],the upper bound on tan β is tan β≤30 after the inclusion of major theoretical uncertainties;（b）Forthe case of tan β≤20,a light charged Higgs boson with a mass around 300 GeV is allowed;and（c）The bounds ontan β and MHare strongly correlated:a smaller（larger）tan β means a lighter（heavier）charged Higgs boson.