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arXiv 0907.5135hep-ph
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面对味物理数据的II型双Higgs二重态

The Two Higgs Doublet of Type II facing flavour physics data

O. Deschamps, S. Descotes-Genon, S. Monteil, V. Niess, S. T'Jampens, V. Tisserand

摘要:

我们讨论了测试的两个希格斯双重模型(2 HDM)的第二型的带电希格斯部门在最近的味道物理数据。特别注意的是最近测量的纯轻子衰变的重轻介子,偏离或多或少显着的标准模型(SM)的预测。我们从轻子和半轻子$ΔF=1$衰变以及回路过程($b \to s γ$,$B\bar{B}$混合或$Z\to\bar{b}b$)敏感的带电希格斯贡献的2 HDM类型II的参数的约束。这项工作的结果是,虽然2 HDM II型可以通过微调方案来拟合个体观测值,但在组合分析中,它并不比SM更好地表现出解耦解决方案。假设在自然界中实现了2 HDM类型II,导出了对其参数($m_{H^+}$和$\tan β$)的约束。得到了荷电Higgs质量$m_{H^+} > 316 \; {\rm GeV}$在$95\%$ ~CL的极限,与$\tan β$的值无关.该极限由$b\rightarrow s γ$分支比测量决定。所有结果都是使用\ckmfitter \分析软件包获得的,该软件包采用频率统计方法\rfit \来处理理论不确定性。

英文摘要:

We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model (2HDM) of Type II in the light of recent flavour physics data. Particular attention is paid to recent measurement of purely leptonic decays of heavy-light mesons, which depart more or less significantly from the Standard Model (SM) predictions. We derive constraints on the parameters of the 2HDM type II from leptonic and semileptonic $ΔF=1$ decays as well as loop processes ($b \to s γ$, $B\bar{B}$ mixing or $Z\to\bar{b}b$) sensitive to charged Higgs contributions. The outcome of this work is that while 2HDM Type II can fit individual observable through fine-tuning schemes, in a combined analysis it does not perform better than the SM by favouring a decoupling solution. Assuming that 2HDM Type II is realized in Nature, constraints on its parameters ($m_{H^+}$ and $\tan β$) are derived. A limit on the charged Higgs mass $m_{H^+} > 316 \; {\rm GeV}$ at $95\%$~CL is obtained irrespective of the value of $\tan β$. This limit is dominated by the $b\rightarrow s γ$ branching ratio measurement. All results have been obtained with the \ckmfitter\ analysis package, featuring the frequentist statistical approach \rfit\ to handle theoretical uncertainties.

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