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arXiv 1012.5382hep-ex
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用ATLAS探测器测量sqrt(s)= 7 TeV pp碰撞中喷注产生的W玻色子截面

Measurement of the production cross section for W-bosons in association with jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The ATLAS Collaboration

摘要:

这封信报告的第一次测量的包容W+喷流截面质子碰撞在质心能量为7 TeV的大型强子对撞机,与ATLAS探测器。截面,在电子和μ介子衰变模式的W玻色子,提出作为一个功能的喷射多重性和横向动量的领先和下一个领先的喷气事件。本文还给出了喷流多重数n=1 ~ 4时横截面σ(W + \ge n)/σ(W+ \ge n-1)的测量结果。结果,基于一个积分亮度为1.3 PB-1,已被校正为所有已知的检测器的影响,并引用在有限的和明确定义的范围内的喷流和轻子运动学。测得的截面进行比较粒子级的预测微扰QCD的基础上。下一个领先的顺序计算,这里研究的n \le 2,发现与数据吻合良好。前导阶多部分子事件发生器,归一化的NNLO总截面,描述的数据以及所有测量的射流多重性。

英文摘要:

This Letter reports on a first measurement of the inclusive W+jets cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC, with the ATLAS detector. Cross sections, in both the electron and muon decay modes of the W boson, are presented as a function of jet multiplicity and of the transverse momentum of the leading and next-to-leading jets in the event. Measurements are also presented of the ratio of cross sections sigma(W+ \ge n) / sigma(W+ \ge n-1) for inclusive jet multiplicities n=1-4. The results, based on an integrated luminosity of 1.3 pb-1, have been corrected for all known detector effects and are quoted in a limited and well-defined range of jet and lepton kinematics. The measured cross sections are compared to particle-level predictions based on perturbative QCD. Next-to-leading order calculations, studied here for n \le 2, are found in good agreement with the data. Leading-order multiparton event generators, normalized to the NNLO total cross section, describe the data well for all measured jet multiplicities.

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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