arXiv 2004.121812020-04hep-ex

$\sqrt{s} = $ 13 TeV质子-质子碰撞中单顶夸克PDMATHAAB通道产生的TeV矩阵元测量

Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s} = $ 13 TeV

CMS Collaboration

备注：: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-012 (CMS Public Pages)
发表信息：: Phys. Lett. B 808 (2020) 135609
DOI：: 10.1016/j.physletb.2020.135609

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摘要：

第一个直接的，模型无关的测量Cabibbo-Kobayashi-Maskawa（CKM）矩阵元素$|V_\mathrm{tb}|$，$|V_\mathrm{td}|$，和$|V_\mathrm{ts}|$的模量，在富含单顶夸克$t$通道事件的最终状态。该分析使用了CMS实验在2016年收集的LHC质子-质子碰撞数据，质心能量为13 TeV，对应于35.9 fb $^{-1}$的积分光度。过程直接敏感于这些矩阵元素被认为是在生产和衰变顶点的顶夸克。在CKM酉性的标准模型假设中，在95%置信水平下测量的下限为$|V_\mathrm{tb}|$ $>$ 0.970。考虑了标准模型之外的几种理论，并通过释放所涉及参数之间的所有约束，测量了值$|V_\mathrm{tb}| =$ 0.988 $\pm$ 0.024和$|V_\mathrm{td}|^2 + |V_\mathrm{ts}|^2 =$ 0.06 $\pm$ 0.06，其中不确定性包括统计和系统分量。

英文摘要：

The first direct, model-independent measurement is presented of the modulus of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements $|V_\mathrm{tb}|$, $|V_\mathrm{td}|$, and $|V_\mathrm{ts}|$, in final states enriched in single top quark $t$-channel events. The analysis uses proton-proton collision data from the LHC, collected during 2016 by the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Processes directly sensitive to these matrix elements are considered at both the production and decay vertices of the top quark. In the standard model hypothesis of CKM unitarity, a lower limit of $|V_\mathrm{tb}|$ $>$ 0.970 is measured at the 95% confidence level. Several theories beyond the standard model are considered, and by releasing all constraints among the involved parameters, the values $|V_\mathrm{tb}| =$ 0.988 $\pm$ 0.024, and $|V_\mathrm{td}|^2 + |V_\mathrm{ts}|^2 =$ 0.06 $\pm$ 0.06, where the uncertainties include both statistical and systematic components, are measured.

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