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arXiv 0804.1107hep-ex
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TeV =1.96时ppbar碰撞中产生孤立光子和伴随喷流的微分截面的测量

Measurement of the differential cross section for the production of an isolated photon with associated jet in ppbar collisions at sqrt(s)=1.96 TeV

D0 Collaboration, V. Abazov

摘要:

我们使用费米实验室Tevatron ppbar对撞机上D 0探测器在质心能量sqrt(s)=1.96 TeV下收集的1.0 fb^-1数据,研究了ppbar ->光子+喷流+ X的过程。光子在中心快度区|y_gamma| &lt;1.0,横向动量在30&lt;Pt_gamma&lt;400 GeV范围内重建,而喷流在中心|y_jet| &lt;0.8或前向1.5&lt; |y_jet| <2.5 rapidity intervals with Pt_jet>15 GeV范围内重建。微分截面d^3 σ/dPt_gamma dy_gamma dy_jet在四个区域中作为Pt_gamma的函数进行测量,这四个区域的不同在于光子和喷流的相对快度方向。还提出了每个区域中的微分截面之间的比率。次至主导阶QCD预测使用不同的参数化的部分子分布函数和理论尺度的选择进行比较的数据。预测不同时描述的测量归一化和Pt_gamma的依赖性的截面在任何四个测量区域。

英文摘要:

The process ppbar -> photon + jet + X is studied using 1.0 fb^-1 of data collected by the D0 detector at the Fermilab Tevatron ppbar collider at a center-of-mass energy sqrt(s)=1.96 TeV. Photons are reconstructed in the central rapidity region |y_gamma|<1.0 with transverse momenta in the range 30<Pt_gamma<400 GeV while jets are reconstructed in either the central |y_jet|<0.8 or forward 1.5<|y_jet|<2.5 rapidity intervals with Pt_jet>15 GeV. The differential cross section d^3sigma/dPt_gamma dy_gamma dy_jet is measured as a function of Pt_gamma in four regions, differing by the relative orientations of the photon and the jet in rapidity. Ratios between the differential cross sections in each region are also presented. Next-to-leading order QCD predictions using different parameterizations of parton distribution functions and theoretical scale choices are compared to the data. The predictions do not simultaneously describe the measured normalization and Pt_gamma dependence of the cross section in any of the four measured regions.

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