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arXiv 1201.1276hep-ex
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用ATLAS探测器研究sqrt(s)= 7 TeV pp碰撞中W玻色子产生的喷流

Study of jets produced in association with a W boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

我们报告了一项研究的最终状态包含一个W玻色子和强子喷流,产生在质子-质子碰撞的质心能量为7 TeV。这些数据是由欧洲核子研究中心大型强子对撞机上的ATLAS探测器收集的,包含了2010年36 pb^-1的完整数据样本。截面确定使用W玻色子的电子和μ子衰变模式,并作为一个函数的包容性射流多重性,N_jet,多达五个射流。在每个多重性,截面的函数的射流横向动量,标量和的横向动量的带电轻子,失踪的横向动量,和所有的射流,不变的质量谱的射流,和各种组合的轻子和末态射流的快度分布。校正所有的探测器效应和所有的背景,如双玻色子和顶夸克对生产的结果进行了比较,从微扰QCD粒子水平的预测。前导阶多部分子事件发生器,归一化到NNLO总截面的包容性W玻色子生产,描述的数据合理以及所有测量的包容性射流多重性。本文研究的MCFM(N_jet >= 2)和BlackHat-Sherpa(N_jet >= 4)的次首阶计算结果与实验数据基本吻合。

英文摘要:

We report a study of final states containing a W boson and hadronic jets, produced in proton-proton collisions at a center-of-mass energy of 7 TeV. The data were collected with the ATLAS detector at the CERN LHC and comprise the full 2010 data sample of 36 pb^-1. Cross sections are determined using both the electron and muon decay modes of the W boson and are presented as a function of inclusive jet multiplicity, N_jet, for up to five jets. At each multiplicity, cross sections are presented as a function of jet transverse momentum, the scalar sum of the transverse momenta of the charged lepton, missing transverse momentum, and all jets, the invariant mass spectra of jets, and the rapidity distributions of various combinations of leptons and final-state jets. The results, corrected for all detector effects and for all backgrounds such as diboson and top quark pair production, are compared with particle-level predictions from perturbative QCD. Leading-order multiparton event generators, normalized to the NNLO total cross section for inclusive W-boson production, describe the data reasonably well for all measured inclusive jet multiplicities. Next-to-leading-order calculations from MCFM, studied here for N_jet >= 2, and BlackHat-Sherpa, studied here for N_jet >= 4, are found to be mostly in good agreement with the data.

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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