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arXiv 0812.2517hep-ex
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在HERA上测量深虚康普顿散射的Q^2、W和t依赖性

A measurement of the Q^2, W and t dependences of deeply virtual Compton scattering at HERA

ZEUS Collaboration

摘要:

在HERA实验中,利用ZEUS探测器测量了e^+p碰撞中的深度虚康普顿散射,其积分亮度为61.1 pb^-1。截面表示为光子虚度Q^2和光子-质子质心能量W的函数,在相空间的宽区域内,Q^2>~1.5 GeV^2,40<W<170 GeV。在最前面的质子光谱仪中测量散射质子的事件的子样本(对应于31.3 pb^-1的积分亮度)被用于作为t函数的微分截面的第一次直接测量,其中t是质子顶点处四动量转移的平方。

英文摘要:

Deeply virtual Compton scattering has been measured in e^+p collisions at HERA with the ZEUS detector using an integrated luminosity of 61.1 pb^-1. Cross sections are presented as a function of the photon virtuality, Q^2, and photon-proton centre-of-mass energy, W, for a wide region of the phase space, Q^2>~1.5 GeV^2 and 40<W<170 GeV. A subsample of events in which the scattered proton is measured in the leading proton spectrometer, corresponding to an integrated luminosity of 31.3 pb^-1, is used for the first direct measurement of the differential cross section as a function of t, where t is the square of the four-momentum transfer at the proton vertex.

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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