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arXiv 1206.2270hep-ex
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深度非弹性ep散射中伴随喷流的孤立光子的测量

Measurement of isolated photons accompanied by jets in deep inelastic ep scattering

ZEUS Collaboration

摘要:

用HERA的ZEUS探测器在深度非弹性ep散射中测量了伴随喷流的孤立高能光子的产生,其积分亮度为326 pb^{-1}。我们对交换光子虚量Q^2进行了测量,测量范围为10 ~ 350 GeV^2。光子在横向能量和伪快度范围4 < ET^gamma < 15 GeV和-0.7 < eta^gamma < 0.9内测量,喷流在横向能量和伪快度范围2.5 < ET^jet <35 GeV和-1.5 < eta^jet < 1.8内测量。微分截面作为这些量的函数。微扰QCD预测给出了一个合理的描述的形状的测量截面在大部分的运动学范围内,但绝对归一化是典型的不一致的20- 30%。

英文摘要:

The production of isolated high-energy photons accompanied by jets has been measured in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326 pb^{-1}. Measurements were made for exchanged photon virtualities, Q^2, in the range 10 to 350 GeV^2. The photons were measured in the transverse-energy and pseudorapidity ranges 4 < ET^gamma < 15 GeV and -0.7 < eta^gamma < 0.9, and the jets were measured in the transverse-energy and pseudorapidity ranges 2.5 < ET^jet <35 GeV and -1.5 < eta^jet < 1.8. Differential cross sections are presented as functions of these quantities. Perturbative QCD predictions give a reasonable description of the shape of the measured cross sections over most of the kinematic range, but the absolute normalisation is typically in disagreement by 20-30%.

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