Search for new physics in top quark production with additional leptons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV using effective field theory
Search for new physics in top quark production with additional leptons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV using effective field theory
复制标题
使用有效场理论在 $$ sqrt{s} $$ = 13 TeV 的质子-质子碰撞中寻找顶夸克产生中的新物理
DOI：
10.1007/jhep03(2021)095
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发表时间：
2021
影响因子：
5.4
通讯作者：
Lechner, L.
中科院分区：
文献类型：
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作者：
Sirunyan, A. M.;Tumasyan, A.;Adam, W.;Bergauer, T.;Dragicevic, M.;Escalante Del Valle, A.;Frühwirth, R.;Jeitler, M.;Krammer, N.;Lechner, L.
事件包含一个或多个顶夸克产生额外的提示轻子用于搜索有效场论（EFT）框架内的新物理。这些数据对应于2017年CMS实验收集的大型强子对撞机质心能量为13 TeV的质子-质子碰撞的综合光度为41.5 fb−1。所选事件必须具有两个具有相同电荷的轻子或两个以上的轻子；喷流，包括已识别的底夸克喷流，也是必需的，所选择的事件根据这些物体的多样性被分为不同的类别。十六维六算符可以影响与附加带电轻子产生的顶夸克有关的过程，在这个分析中被考虑。为了直接针对EFT效应，该分析采用了一种新的方法，将观察到的产量参数化为EFT算子的威尔逊系数（WCs）。同时对16个WCs与数据进行拟合，并提取WCs的两个标准差置信区间；对于所探测的所有WC， WC值的标准模型期望值都在这些区间内。
Events containing one or more top quarks produced with additional prompt leptons are used to search for new physics within the framework of an effective field theory (EFT). The data correspond to an integrated luminosity of 41.5 fb− 1 of proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, collected by the CMS experiment in 2017. The selected events are required to have either two leptons with the same charge or more than two leptons; jets, including identified bottom quark jets, are also required, and the selected events are divided into categories based on the multiplicities of these objects. Sixteen dimension-six operators that can affect processes involving top quarks produced with additional charged leptons are considered in this analysis. Constructed to target EFT effects directly, the analysis applies a novel approach in which the observed yields are parameterized in terms of the Wilson coefficients (WCs) of the EFT operators. A simultaneous fit of the 16 WCs to the data is performed and two standard deviation confidence intervals for the WCs are extracted; the standard model expectations for the WC values are within these intervals for all of the WCs probed.