We define and study hard ``semi-exclusive'' processes of the form $A+B \to C + Y$ which are characterized by a large momentum transfer between the particles $A$ and $C$ and a large rapidity gap between the final state particle $C$ and the inclusive system $Y$. Such reactions are in effect generalizations of deep inelastic lepton scattering, providing novel currents which probe specific quark distributions of the target $B$ at fixed momentum fraction. We give explicit expressions for photo- and leptoproduction cross sections such as pion distribution amplitude. Semi-exclusive processes provide opportunities to study fundamental issues in QCD, including odderon exchange and color transparency, and suggest new ways to measure spin-dependent parton distributions.
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机译：我们定义并研究形式为$ A + B \到C + Y $的硬``半排他''过程，其特征是粒子$ A $和$ C $之间的动量传递很大，并且粒子之间的快速间隙很大最终状态粒子$ C $和包含系统$ Y $。这种反应实际上是深层非弹性轻子散射的一般化，提供了新颖的电流，可探测固定动量分数下目标$ B $的特定夸克分布。我们给出光子生产和le生产横截面的明确表达式，例如介子分布振幅。半排他性过程提供了研究QCD中基本问题的机会，包括奇数交换和颜色透明度，并提出了测量依赖自旋的parton分布的新方法。
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