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arXiv 1006.0946hep-ex
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HERA中ep碰撞的衍射双喷流光生

Diffractive Dijet Photoproduction in ep Collisions at HERA

H1 Collaboration

摘要:

基于一个积分亮度为47 pb^-1的数据样本,给出了衍射光产生中单微分和双微分双射截面的测量结果。这些事件属于ep -> eXY类型,其中强子系统X包含至少两个喷流,并与系统Y(由领先的质子或低质量质子激发组成)隔开一个大的快度间隙。的dijet截面进行了比较,与QCD计算在次领先的顺序,并与Monte Carlo模型的基础上领先的顺序矩阵元素与部分子淋浴。测得的截面小于那些从次到首阶计算得到的约0.6倍。该抑制因子对进入硬子过程的光子四动量的分数x_gamma没有显著的依赖性。首次测量了衍射双射截面与包容双射截面的比值,并与蒙特卡罗模型进行了比较。

英文摘要:

Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb^-1. The events are of the type ep -> eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant dependence on the fraction x_gamma of the photon four-momentum entering the hard subprocess. Ratios of the diffractive to the inclusive dijet cross sections are measured for the first time and are compared with Monte Carlo models.

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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