论文标题
proton-proton碰撞中W玻色子衰减分支的精确测量，$ \ sqrt {s} = $ 13 TEV
Precision measurement of the W boson decay branching fractions in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
W玻色子的Leptonic和包含的HADRONIC衰变分支分支是使用CMM LHC的CMS实验在$ \ sqrt {s} = $ 13 TEV处收集的质子 - 蛋白碰撞数据测量的，与CERN LHC的CMS实验相对应，对应于35.9 fb $^{-1} $ 35.9 fb $^{ - 1} $的集成亮度。根据重建的瘦素的多样性和风味选择并分类以产生一个或两个W玻色子的特征的事件，并分类，JET的数量以及从B Quarks的强发化中确定的JET的数量。在每个事件类别中同时执行W玻色子分支分数的bin的最大似然估计。 W玻色子衰减到电子，Muon和Tau Lepton最终状态的测量分支分数为（10.83 $ \ pm $ 0.10）％（10.94 $ \ pm $ 0.08）％和（分别（10.77 $ \ $ $ \ $ 0.21）％，分别与Lepton Floess的互动通用性一致。估计平均血液和包容性的耐药性衰减分支部分分别为（10.89 $ \ pm $ 0.08）％和（67.32 $ \ pm $ 0.23）％。 Based on the hadronic branching fraction, three standard model quantities are subsequently derived: the sum of squared elements in the first two rows of the Cabibbo-Kobayashi-Maskawa (CKM) matrix $\sum_{ij}\vert V_{ij}\vert^{2}$ = 1.984 $\pm$ 0.021, the CKM element $\vert v_ \ mathrm {cs} \ vert $ = 0.967 $ \ pm $ 0.011，以及在w玻色子质量尺度上的强耦合常数，$α_\ mathrm {s}（m^2_ \ 2_ \ mathrm {w}）$ = 0.095 $ \ pm $ 0.033。
The leptonic and inclusive hadronic decay branching fractions of the W boson are measured using proton-proton collision data collected at $\sqrt{s} =$ 13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Events characterized by the production of one or two W bosons are selected and categorized based on the multiplicity and flavor of reconstructed leptons, the number of jets, and the number of jets identified as originating from the hadronization of b quarks. A binned maximum likelihood estimate of the W boson branching fractions is performed simultaneously in each event category. The measured branching fractions of the W boson decaying into electron, muon, and tau lepton final states are (10.83 $\pm$ 0.10)%, (10.94 $\pm$ 0.08)%, and (10.77 $\pm$ 0.21)%, respectively, consistent with lepton flavor universality for the weak interaction. The average leptonic and inclusive hadronic decay branching fractions are estimated to be (10.89 $\pm$ 0.08)% and (67.32 $\pm$ 0.23)%, respectively. Based on the hadronic branching fraction, three standard model quantities are subsequently derived: the sum of squared elements in the first two rows of the Cabibbo-Kobayashi-Maskawa (CKM) matrix $\sum_{ij}\vert V_{ij}\vert^{2}$ = 1.984 $\pm$ 0.021, the CKM element $\vert V_\mathrm{cs}\vert$ = 0.967 $\pm$ 0.011, and the strong coupling constant at the W boson mass scale, $α_\mathrm{S}(m^2_\mathrm{W})$ = 0.095 $\pm$ 0.033.
