New Physics Effects on Rare Decays B_u^+→π^+■^+■^-, ρ^+■^+■-in a Top Quark Two-Higgs-Doublet Model

作     者：SONG Hai-Zhen LU Lin-Xia LU Gong-Ru 

作者机构：Department of Physics Nanyang Normal University Nanyang 473061 China Department of Physics Henan Normal University Xinxiang 453007 China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2008年第50卷第9期

页      面：696-702页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：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 the Special Study Foundation of Nanyang Normal University under Grant No.nynu200750 

主　　题：new physics effects rare decay two-Higgs-doublet model branching ratio forward-backward asymmetry 

摘      要：Using the form factors from light-cone sum rules, we study the branching ratios and forward-backward asymmetries （FBAs） of the exclusive decays Bu^＋→π^＋e^＋e^- and Bu^＋ →ρ^＋e^＋e^- （e= e,μ） in the standard model （SM） and the top quark two-Higgs-doublet model （T2HDM）. From the numerical results, we find that the new physics contributions cannot provide very large enhancement to the branching ratios and the theoretical predictions are in good agreement with the SM ones. The T2HDM effects on FBAs of these decays are small. Precision measurements of the dilepton invariant mass distributions, especially in the lower dilepton mass region, and the FBAs in the decays Bu^＋ → π^＋ （ρ^＋ ）e^＋ e^- will greatly help in discriminating among the SM and the new physics models.