发表机构
University of Warsaw; Yerevan Physics Institute; Johannes Gutenberg University; Karlsruhe Institute of Technology; RWTH Aachen University; Università di Padova; Istituto Nazionale di Fisica Nucleare, Sezione di Padova; University of Bern; Universität Siegen; Universität Zürich; PSI Center for Neutron and Muon Sciences（华沙大学; 埃里温物理研究所; 约翰内斯·古腾堡美因茨大学; 卡尔斯鲁厄理工学院; 亚琛工业大学; 帕多瓦大学; 意大利国家核物理研究所帕多瓦分部; 伯尔尼大学; 锡根大学; 苏黎世大学; 瑞士保罗谢勒研究所中子与μ子科学中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过完整计算高阶微扰修正及精确夸克质量依赖，得到标准模型下含粲反B介子衰变到奇异光子的分支比，与实验值吻合，并对II型双希格斯二重态模型的带电希格斯质量给出约束。
AI 中文摘要
我们对标准模型及超出标准模型的B介子含粲弱辐射衰变开展了新的升级分析，以更高精度计算其衰变率。我们以形式上完整的方式纳入了O(αₛ)阶微扰修正；在αₛ²阶，精确计算了粲夸克质量对主导修正的依赖关系，消除了以往所有分析中存在的显著不确定性。全局归一化因子及诸多非微扰贡献以b夸克的运动学方案质量和重夸克展开矩阵元表示，这些参数取自最新的半轻子拟合结果，该拟合包含O(αₛ³)阶修正及最新实验数据。针对所考虑衰变的CP及同位旋平均分支比，在光子能量下限Eᵧ>1.6 GeV的条件下，我们得到标准模型中的B_{sγ}^{SM}=(3.54±0.14)×10⁻⁴，该结果与当前实验平均值B_{sγ}^{exp}=(3.49±0.19)×10⁻⁴相符，为超出标准模型的物理提供了约束。特别地，我们在II型双希格斯二重态模型中得到95%置信水平下带电希格斯玻色子质量M_{H^±}>670 GeV。
英文摘要
We present a new and upgraded analysis of the inclusive weak radiative decay of the $B$ meson in the standard model and beyond. The ${\mathcal O}(α_s)$ perturbative corrections are included in a formally complete manner. At the order $α_s^2$, exact dependence on the charm quark mass is calculated for the dominant corrections, which removes a sizeable uncertainty that was present in all the previous analyses. The global normalization factor and many of the non-perturbative contributions are expressed in terms of the kinetic-scheme mass of the $b$-quark and the heavy-quark-expansion matrix elements. These parameters are adopted from the most recent semileptonic fits that include ${\mathcal O}(α_s^3)$ corrections and up-to-date experimental results. We find ${\mathcal B}_{sγ}^{\rm SM} = (3.54 \pm 0.14)\times 10^{-4}$ for the CP- and isospin-averaged branching ratio of the considered decay in the standard model, with a lower cut on the photon energy $E_γ> 1.6\,{\rm GeV}$. It agrees with the current experimental average ${\mathcal B}_{sγ}^{\rm exp} = (3.49 \pm 0.19)\times 10^{-4}$, which provides constraints on beyond standard model physics. In particular, we find $M_{H^\pm} > 670\,{\rm GeV}$ at $95\%\,{\rm C.L.}$ for the charged Higgs boson mass in the two-Higgs-doublet model~II.
Comments5 pages, 3 figures
