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arXiv 1203.3161hep-ex
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用ATLAS探测器测量sqrt(s)= 7 TeV质子-质子碰撞中与喷流有关的孤立光子产生截面

Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

本文测量了质心能量sqrt(s)= 7 TeV的质子-质子碰撞中与喷流有关的孤立光子产生的截面。在赝快度范围内重建光子|η(γ)|<1.37,横能E_T(γ)>25 GeV。在快度范围内重建喷流|y(射流)|<4.4,横向动量p_T(喷流)>20 GeV。在三种不同的超前p_T喷流快度范围内,测量了微分截面dsigma/dE_T(γ),作为光子横向能量的函数:|y(射流)|<1.2,1.2<=| y(射流)|<2.8和2.8<=| y(射流)|< 4.4。对于每种快度构型,分别研究了同号(eta(gamma)y(jet)>=0)和反号(eta(gamma)y(jet)<0)的情况。结果基于大型强子对撞机ATLAS探测器收集的37 pb^-1的积分亮度。次首阶微扰QCD计算结果与实验数据基本一致,但当E_T(gamma)<~45 GeV时,理论计算结果高估了截面.

英文摘要:

A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy sqrt(s) = 7 TeV is presented. Photons are reconstructed in the pseudorapidity range |eta(gamma)|<1.37 and with a transverse energy E_T(gamma)>25 GeV. Jets are reconstructed in the rapidity range |y(jet)|<4.4 and with a transverse momentum p_T(jet)>20 GeV. The differential cross section dsigma/dE_T(gamma) is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-p_T jet: |y(jet)|<1.2, 1.2<=|y(jet)|<2.8 and 2.8<=|y(jet)|< 4.4. For each rapidity configuration the same-sign (eta(gamma)y(jet)>=0) and opposite-sign (eta(gamma)y(jet)<0) cases are studied separately. The results are based on an integrated luminosity of 37 pb^-1, collected with the ATLAS detector at the LHC. Next-to-leading order perturbative QCD calculations are found to be in fair agreement with the data, except for E_T(gamma)<~45 GeV, where the theoretical predictions overestimate the measured cross sections.

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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