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arXiv 1203.4495hep-ex
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HERA衍射深度非弹性散射的包含测量

Inclusive Measurement of Diffractive Deep-Inelastic Scattering at HERA

H1 Collaboration

摘要:

利用HERA的H1实验研究了衍射过程ep \rightarrow eXY(Y表示MY < 1.6 GeV的质子或其低质量激发)。分析仅限于光子虚3 \leq Q2 \leq 1600 GeV ~ 2的相空间区域,质子顶点处四动量转移的平方|t| < 1.0 GeV ~ 2,入射质子的纵向动量分数由无色交换xIP < 0.05。测量三重微分截面作为xIP、Q2和β = x/xIP的函数,其中x是Bjorken标度变量。这些测量是在选择衍射事件后进行的,通过要求将末态强子系统X和Y分开一个大的空快度间隔。高统计测量涵盖的数据采集期间1999-2000年和2004-2007年与以前公布的结果相结合,以提供一个单一的一套衍射截面从H1实验使用大快度间隙选择方法。合并后的数据比以前公布的结果增加了三到三十倍。测量结果进行了比较,从非线性光学QCD计算的基础上衍射部分子密度和偶极子模型的预测。质子顶点因子分解假说进行了测试。

英文摘要:

The diffractive process ep \rightarrow eXY, where Y denotes a proton or its low mass excitation with MY < 1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 \leq Q2 \leq 1600 GeV2, the square of the four-momentum transfer at the proton vertex |t| < 1.0 GeV2 and the longitudinal momentum fraction of the incident proton carried by the colourless exchange xIP < 0.05. Triple differential cross sections are measured as a function of xIP, Q2 and beta = x/xIP where x is the Bjorken scaling variable. These measurements are made after selecting diffractive events by demanding a large empty rapidity interval separating the final state hadronic systems X and Y . High statistics measurements covering the data taking periods 1999-2000 and 2004-2007 are combined with previously published results in order to provide a single set of diffractive cross sections from the H1 experiment using the large rapidity gap selection method. The combined data represent a factor between three and thirty increase in statistics with respect to the previously published results. The measurements are compared with predictions from NLO QCD calculations based on diffractive parton densities and from a dipole model. The proton vertex factorisation hypothesis is tested.

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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