论文标题
$ \ sqrt {s} = $ 13 tev的pp $ \ to $ zz生产横截面的测量和约束
Measurements of pp $\to$ ZZ production cross sections and constraints on anomalous triple gauge couplings at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
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.数据样本对应于2016- 2018年收集的137 fb $^{ - 1} $的集成光度。 ZZ生产横截面，$σ_{\ text {tot}} $（pp $ \ \ $ zz）= 17.2 $ \ pm $ 0.3（stat）$ \ pm $ \ pm $ \ pm $ \ pm $ \ pm \ pm $ 0.4（theo）$ \ pm $ $ $ 0.3（lumi）pb pp s s s s s slood Slays same for Eyter Same for Eyter Slays foraft of Eyter Same foraft of Eyter Same-foraft of Eyter slays f。 $ \ lt $ $ m _ {\ ell^+\ ell^ - } $ $ \ lt $ 120 GEV与标准模型预测一致。还测量了差分横截面并与理论预测一致。四边形系统的不变质量分布用于对异常的zzz和zz $γ$耦合设置限制。
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.
