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用振幅比值方法预言中性粲介子衰变到CP本征态的CP不对称性(英文)
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作者 杜东生 《高能物理与核物理》 CSCD 北大核心 2007年第9期835-839,共5页
用振幅比之方法计算了中性粲介子衰变到CP本征态的CP不对称性.计算了时间相关和时间积分的CP不对称性.结果表明,时间积分的CP不对称参数约为千分之一的量级.还讨论了在BESⅢ和B工厂上实验检验的可能性.
关键词 中性粲介子cp不对称性 cp本征态
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B→K^*у/Decay in Top-Quark Two-Higgs-Doublet Model
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作者 XIAO Zhen-Jun CHENG Hui-Hui Lü Lin-Xia 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第5X期895-900,共6页
By employing the QCD factorization approach for the exclusive B→Vу decays, we study the exclusive decay B→K^*у in the top-quark two-Higgs-doublet mode/(T2HDM). Within the considered parameter space, we find the... By employing the QCD factorization approach for the exclusive B→Vу decays, we study the exclusive decay B→K^*у in the top-quark two-Higgs-doublet mode/(T2HDM). Within the considered parameter space, we find the following conclusions (a) A hght charged-Higgs boson with a mass about 200 GeV is clearly excluded by the date of B→K^*у decay, and this lower limit is comparable with that from the inclusive B→X8*у decay; (b) The theoretical predictions for CP asymmetry of B→K^*у in the T2HDM is always less than 1% in size; and (c) The isospin symmetry breaking for B→K^*у decay in the SM and T2HDM considered here is around 6% in size and well consistent with the data and the general expectations. 展开更多
关键词 B meson decay charged-Higgs boson branching ratio cp asymmetry
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