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arXiv 1107.3015hep-phhep-exnucl-exnucl-th
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中高能类时Compton散射

On timelike Compton scattering at medium and high energies

B. Pire, L. Szymanowski, J. Wagner

摘要:

本文以类时康普顿散射(TCS)和深虚康普顿散射(DVCS)为例,强调了深排斥过程的类时和类空研究的互补性,其中类时康普顿散射是指具有大不变质量的轻子对的光生过程,深虚康普顿散射是指实光子的光生过程。这两个振幅因子分解与相同的广义部分子分布(GPD)作为其软部分和系数函数,显着不同,在下一个领先的顺序α_s。我们还强调,在非常高的能量TCS的数据应该很快就可以在LHC的超周边碰撞的研究,打开一个窗口,夸克和胶子GPD在非常小的偏度。

英文摘要:

We emphasize the complementarity of timelike and spacelike studies of deep exclusive processes, taking as an example the case of timelike Compton Scattering (TCS) i.e. the exclusive photoproduction of a lepton pair with large invariant mass, vs deeply virtual Compton scattering (DVCS) i.e. the exclusive leptoproduction of a real photon. Both amplitudes factorize with the same generalized parton distributions (GPDs) as their soft parts and coefficient functions which differ significantly at next to leading order in alpha_s. We also stress that data on TCS at very high energy should be available soon thanks to the study of ultraperipheral collisions at the LHC, opening a window on quark and gluon GPDs at very small skewness.

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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