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arXiv 1005.4529hep-phhep-ex
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TeV强子对撞机孤立光子产生对质子中胶子分布的敏感性

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Raphaelle Ichou, David d'Enterria

摘要:

我们比较了在sqrt(s)=1.96 TeV的质子-反质子碰撞中在高横能下测量的孤立光子的单包含谱与次领先阶微扰QCD预测以及各种参数化的部分子分布函数(PDF)。在实验和理论的不确定性,Tevatron数据可以同样很好地再现最近的CTEQ6.6,MSTW 08和NNPDF1.2 PDF集。我们还提出了在sqrt(s)= 14 TeV的质子-质子碰撞中,与LHC实验相关的中心(y=0)和前向(y=4)快度的孤立γ谱的预测。不同的质子PDF导致在预期的E_T-微分隔离伽马截面中的最大变化为30%。在全局PDF拟合中包含孤立光子数据将对胶子密度施加额外的独立约束。

英文摘要:

We compare the single inclusive spectra of isolated photons measured at high transverse energy in proton-antiproton collisions at sqrt(s)=1.96 TeV with next-to-leading order perturbative QCD predictions with various parametrizations of the parton distribution functions (PDFs). Within the experimental and theoretical uncertainties, the Tevatron data can be reproduced equally well by the recent CTEQ6.6, MSTW08 and NNPDF1.2 PDF sets. We present also the predictions for isolated gamma spectra in proton-proton collisions at sqrt(s)=14TeV for central (y=0) and forward (y=4) rapidities relevant for LHC experiments. Different proton PDFs result in maximum variations of order 30% in the expected E_T-differential isolated gamma cross sections. The inclusion of the isolated photon data in global PDF fits will place extra independent constraints on the gluon density.

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