$ \overline{B}\ \to {X_s}\gamma $ in the Two Higgs Doublet Model up to next-to-next-to-leading order in QCD
$ \overline{B}\ \to {X_s}\gamma $ in the Two Higgs Doublet Model up to next-to-next-to-leading order in QCD
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DOI：
10.1007/jhep11(2012)036
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发表时间：
2012-08
影响因子：
5.4
通讯作者：
Thomas Hermann;M. Misiak;M. Steinhauser
中科院分区：
文献类型：
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作者：
Thomas Hermann;M. Misiak;M. Steinhauser
我们通过对小、中和大带电希格斯玻色子质量应用展开式，计算对两个希格斯双峰模型中威尔逊系数 C 7 和 C 8 的三环匹配校正。结果用于评估 \(\overline {B}\\to {X_s}\gamma\) 的分支比与下一个到前导顺序的精度，并确定带电希格斯玻色子质量的更新下限。当考虑到最近完成的 BABAR 数据分析时，我们发现 M H+≥ 380GeV 的置信度为 95%。与之前的计算相比，我们的带电希格斯粒子对支化比的贡献结果显示出对匹配尺度 μ 0 的敏感性要弱得多。
We compute three-loop matching corrections to the Wilson coefficients C 7 and C 8 in the Two Higgs Doublet Model by applying expansions for small, intermediate and large charged Higgs boson masses. The results are used to evaluate the branching ratio of\(\overline {B}\\to {X_s}\gamma\) to next-to-next-to leading order accuracy, and to determine an updated lower limit on the charged Higgs boson mass. We find M H+≥ 380GeV at 95% confidence level when the recently completed BABAR data analysis is taken into account. Our results for the charged Higgs contribution to the branching ratio exhibit considerably weaker sensitivity to the matching scale μ 0, as compared to previous calculations.