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arXiv 0906.5256hep-ph
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超周边碰撞中的类时康普顿散射

Timelike Compton Scattering in Ultraperipheral Collisions

B. Pire, L. Szymanowski, J. Wagner

摘要:

在强子对撞机的超周边碰撞中,已经并将测量到双轻子的光生,γ N ->l+l- N。我们证明了类时深虚康普顿散射(TCS)机制gamma q -> l+l- q(其中轻子对来自子过程gamma q -> gamma* q)在某些可达的运动学区域占主导地位,从而为研究小偏斜度下核子中的广义部分子分布(GPD)开辟了一条新的途径.

英文摘要:

Exclusive photoproduction of dileptons, gamma N ->l+l- N, is and will be measured in ultraperipheral collisions at hadron colliders. We demonstrate that the timelike deeply virtual Compton scattering (TCS) mechanism gamma q -> l+l- q, where the lepton pair comes from the subprocess gamma q -> gamma* q, dominates in some accessible kinematical regions, thus opening a new way to study generalized parton distributions (GPD) in the nucleon at small skewedness.

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