arXiv 1606.017362016-06-06hep-ex

用ATLAS探测器测量pp碰撞$\sqrt{s}$ = 8 TeV的高质量Drell-Yan双微分截面

Measurement of the double-differential high-mass Drell-Yan cross section in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

ATLAS Collaboration

备注：: 43 pages plus author list + cover pages (61 pages total), 13 figures, 11 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-06/
发表信息：: JHEP 08 (2016) 009
DOI：: 10.1007/JHEP08(2016)009

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摘要：

本文测量了Drell-Yan $Z/γ^{*} \rightarrow \ell^{+} \ell^{-}$和光子诱导$γγ\rightarrow \ell^{+} \ell^{-}$过程的双微分截面，其中$\ell$是电子或μ子。测量的轻子对，$m_{\ell\ell}$，在116 GeV和1500 GeV之间的不变质量，使用的样本20.3 fb $^{-1}$的pp碰撞数据在质量中心的能量为$\sqrt{s}$ = 8 TeV的ATLAS探测器在LHC在2012年。对数据进行了不变质量和绝对双轻子快度以及轻子对不变质量和绝对赝快度分离的双微分。还报道了作为$m_{\ell\ell}$的函数的单微分截面。电子和μ子通道的测量相结合，总的实验精度优于1%，在低$m_{\ell\ell}$实现。比较次到次到领先阶微扰QCD预测使用几个最近的部分子分布函数，包括次到领先阶电弱效应表明的数据约束部分子分布函数的潜力。特别是，一个很大的影响的数据上的光子PDF证明。

英文摘要：

This paper presents a measurement of the double-differential cross section for the Drell-Yan $Z/γ^{*} \rightarrow \ell^{+} \ell^{-}$ and photon-induced $γγ\rightarrow \ell^{+} \ell^{-}$ processes where $\ell$ is an electron or muon. The measurement is performed for invariant masses of the lepton pairs, $m_{\ell\ell}$, between 116 GeV and 1500 GeV, using a sample of 20.3 fb$^{-1}$ of pp collisions data at centre-of-mass energy of $\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC in 2012. The data are presented double differentially in invariant mass and absolute dilepton rapidity as well as in invariant mass and absolute pseudorapidity separation of the lepton pair. The single-differential cross section as a function of $m_{\ell\ell}$ is also reported. The electron and muon channel measurements are combined and a total experimental precision of better than 1% is achieved at low $m_{\ell\ell}$. A comparison to next-to-next-to-leading order perturbative QCD predictions using several recent parton distribution functions and including next-to-leading order electroweak effects indicates the potential of the data to constrain parton distribution functions. In particular, a large impact of the data on the photon PDF is demonstrated.

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