中性黑格斯玻色子对分支比Br(B→Xsl+l-)的贡献

摘要

The authors calculate the new physics contributions to the branching ratios of the rare decays B →Xsl+l- (l = e, μ) induced by neutral Higgs bosons loop diagrams in the top quark two-Higgs-doublet model (T2HDM).From the numerical calculations, it is found that (a) the neutral Higgs boson's correction to B→Xsl+l- decays interferes constructively with its standard model counterpart, but small in magnitude; and (b) if the neutral Higgs masses are larger than 100 GeV and β＜40 , their contributions to the branching ratio of B→Xsl+l- decays can be neglected safely.%在top夸克双Higgs模型下计算了由中性黑格斯玻色子导致的圈图对稀有衰变B→Xsl+l-(l=e,μ)分支比的贡献.通过数值计算发现:①中性黑格斯玻色子对B→Xxl+l-衰变过程的贡献与标准模型部分相互加强,但增加的幅度较小;②当中性黑格斯玻色子的质量大于100GeV,tanβ≤40时,可以忽略中性黑格斯玻色子对B→Xxl+l-(l=e,μ)分支比的贡献.