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arXiv 1402.6263hep-ex
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用ATLAS探测器测量q rt(s)=7 TeV pp碰撞中与粲夸克相关的W玻色子的产生

Measurement of the production of a W boson in association with a charm quark in pp collisions at sqrt(s)=7 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

利用大型强子对撞机上ATLAS探测器收集到的sqrt(s)=7 TeV的pp碰撞数据,研究了与单个粲夸克结合的W玻色子的产生。在W玻色子衰变为电子或μ子的事件中,粲夸克被标记为半轻子衰变为μ子或存在粲介子。测量了W玻色子衰变的积分和微分截面随轻子赝快度的变化。结果进行了比较,从各种部分子分布函数参数化获得的下一个领导阶QCD计算的预测。在Q^2=1.9 GeV^2时,奇异海夸克与下海夸克的分布之比被确定为0.96 + 0.26 - 0.30,这支持了轻夸克海的SU(3)对称组成的假设。此外,截面比σ(W^+ + bar{c})/σ(W^- + c)与使用部分子分布函数参数化获得的预测进行了比较,并对s-bar {s}夸克不对称性进行了不同的假设。

英文摘要:

The production of a W boson in association with a single charm quark is studied using 4.6 fb^-1 of pp collision data at sqrt(s)=7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96 +0.26 -0.30 at Q^2=1.9 GeV^2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio sigma(W^+ + bar{c})/sigma(W^- + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s-bar{s} quark asymmetry.

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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