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arXiv 0709.4114hep-ex
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HERA深虚康普顿散射的测量及其与时间的关系

Measurement of Deeply Virtual Compton Scattering and its t-dependence at HERA

H1 Collaboration

摘要:

本文介绍了用HERA的H1探测器记录的e-p碰撞数据测量弹性深虚康普顿散射γ * p -> γ p。经过分析的数据样本对应的积分亮度为145 pb^-1。在6.5 < Q^2 < 80 GeV^2,30 < W < 140 GeV和|t| < 1 GeV^2的运动学域中,测量截面作为交换光子的虚质量Q^2和伽马 *p系统的质心能量W的函数,其中t表示质子顶点处的动量转移的平方。对于不同的Q^2和W值,截面在t中是不同的,并推导出指数t斜率参数。的测量进行了比较,一个非线性光学QCD计算的基础上广义部分子分布。在偶极子方法的背景下,DVCS截面的几何标度性质的研究,为不同的值的t。

英文摘要:

A measurement of elastic deeply virtual Compton scattering gamma* p -> gamma p using e-p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 145 pb^-1. The cross section is measured as a function of the virtuality Q^2 of the exchanged photon and the centre-of-mass energy W of the gamma*p system in the kinematic domain 6.5 < Q^2 < 80 GeV^2, 30 < W < 140 GeV and |t| < 1 GeV^2, where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q^2 and W values and exponential t-slope parameters are derived. The measurements are compared to a NLO QCD calculation based on generalised parton distributions. In the context of the dipole approach, the geometric scaling property of the DVCS cross section is studied for different values of t.

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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