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arXiv 2009.01186hep-ex
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在$\sqrt{s} =$ 13 TeV上测量pp $\to$ ZZ产生截面和对反常三规范耦合的约束

Measurements of pp $\to$ ZZ production cross sections and constraints on anomalous triple gauge couplings at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

本文利用欧洲核子研究中心(CERN)大型强子对撞机(LHC)的CMS探测器,在质心能量为13 TeV的条件下,研究了质子-质子(pp)碰撞中Z玻色子对pp $\to$(Z/$γ^*$)(Z/ $γ^*$)$\to$ 2 $\ell$ 2 $\ell'$,其中$\ell,\ell'$ = e或$μ$的产生.数据样本对应于2016-2018年期间收集的137 fb $^{-1}$的积分光度。ZZ产生截面,$σ_{\text{tot}}$(pp $\to$ ZZ)= 17.2 $\pm$ 0.3(stat)$\pm$ 0.5(syst)$\pm$ 0.4(theo)$\pm$ 0.3(lumi)pb,是在质量为60 $\lt$ $m_{\ell^+\ell^-}$ $\lt $ 120 GeV的区域中产生的两对相反符号、相同味道的轻子的事件中测量的,与标准模型的预测一致。微分截面也进行了测量,并同意与理论预测。四轻子系统的不变质量分布被用来限制反常的ZZZ和ZZ $γ$耦合。

英文摘要:

The production of Z boson pairs in proton-proton (pp) collisions, pp $\to$ (Z/$γ^*$)(Z/$γ^*$) $\to$ 2$\ell$ 2$\ell'$, where $\ell,\ell'$ = e or $μ$, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 137 fb$^{-1}$, collected during 2016-2018. The ZZ production cross section, $σ_{\text{tot}}$ (pp $\to$ ZZ) = 17.2 $\pm$ 0.3 (stat) $\pm$ 0.5 (syst) $\pm$ 0.4 (theo) $\pm$ 0.3 (lumi) pb, measured for events with two pairs of opposite-sign, same-flavor leptons produced in the mass region 60 $\lt$ $m_{\ell^+\ell^-}$ $\lt $ 120 GeV is consistent with standard model predictions. Differential cross sections are also measured and agree with theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ$γ$ couplings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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