arXiv 1610.075852016-10hep-ex

用带有ATLAS探测器的$ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$和$ZZ\to\ell^{-}\ell^{+}ν\barν$通道测量$\sqrt{s}$碰撞中$ZZ$产生截面

Measurement of the $ZZ$ production cross section in $pp$ collisions at $\sqrt{s}$ = 8 TeV using the $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to\ell^{-}\ell^{+}ν\barν$ channels with the ATLAS detector

ATLAS Collaboration

备注：: 55 pages in total, author list starting page 39, 9 figures, 11 tables, accepted for publication in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-16/
发表信息：: JHEP 01 (2017) 099
DOI：: 10.1007/JHEP01(2017)099

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摘要：

在欧洲核子研究中心的大型强子对撞机上，利用ATLAS实验在2012年收集的20.3 fb $^{-1}$的积分光度对应的数据，测量了$\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$和$\ell^{-}\ell^{+}ν\barν$通道$(\ell = e, μ)$在$\sqrt{s} = 8$ TeV质子-质子碰撞中的$ZZ$产生。在选定的相空间区域测量$ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$和$ZZ\to \ell^{-}\ell^{+}ν\barν$的基准截面。从两个通道的组合中测得质量范围为66至116 GeV的两个$Z$玻色子产生的$ZZ$事件的总截面为$7.3\pm0.4\textrm{(stat)}\pm0.3\textrm{(syst)}\pm0.2\textrm{(lumi)}$ pb，这与标准模型预测的$6.6^{+0.7}_{-0.6}$ pb一致。给出了不同运动变量的箱中的微分截面。微分事件产率作为领先的$Z$玻色子的横向动量的函数被用来设置在$ZZ$生产异常中性三重规范玻色子耦合的限制。

英文摘要：

A measurement of the $ZZ$ production in the $\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $\ell^{-}\ell^{+}ν\barν$ channels $(\ell = e, μ)$ in proton--proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for $ZZ\to\ell^{-}\ell^{+}\ell^{\prime -}\ell^{\prime +}$ and $ZZ\to \ell^{-}\ell^{+}ν\barν$ are measured in selected phase-space regions. The total cross section for $ZZ$ events produced with both $Z$ bosons in the mass range 66 to 116 GeV is measured from the combination of the two channels to be $7.3\pm0.4\textrm{(stat)}\pm0.3\textrm{(syst)}\pm0.2\textrm{(lumi)}$ pb, which is consistent with the Standard Model prediction of $6.6^{+0.7}_{-0.6}$ pb. The differential cross sections in bins of various kinematic variables are presented. The differential event yield as a function of the transverse momentum of the leading $Z$ boson is used to set limits on anomalous neutral triple gauge boson couplings in $ZZ$ production.

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