Abstract At high energy, exclusive meson photo- and electro-production give access to the structure of hadronic matter. At low momentum transfers, the exchange of a few Regge trajectories leads to a comprehensive account of the cross-sections. Among these trajectories, which are related to the mass spectrum of families of mesons, the Pomeron plays an interesting role as it is related to glue-ball excitations. At high momentum transfers, the exchange of these collective excitations is expected to reduce to the exchange of their simplest (quark or gluon) components. However, contributions from unitarity rescattering cuts are relevant even at high energies. In the JLab energy range, the asymptotic regime, where the players in the game are current quarks and massless gluons has not been reached yet. One has to rely on more effective degrees of freedom adapted to the scale of the probe. A consistent picture, the “Partonic Non-Perturbative Regime”, is emerging. The properties of its various components (dressed propagators, effective coupling constants, quark wave functions, shape of the Regge trajectories, etc.) provide us with various links to hadron properties. I will review the status of the field, will put in perspective the current achievements at JLab, SLAC and Hermes, and will assess future developments that are made possible by continuous electron beams at higher energies.

中文翻译：

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独家介子光电生产，强子物质结构的窗口

摘要 在高能时，独特的介子光和电产生可以了解强子物质的结构。在低动量转移时，几个 Regge 轨迹的交换导致对横截面的全面说明。在这些与介子家族的质谱相关的轨迹中，波梅隆扮演着一个有趣的角色，因为它与胶球激发有关。在高动量转移时，这些集体激发的交换预计会减少到它们最简单的（夸克或胶子）成分的交换。然而，即使在高能量下，幺正性再散射切割的贡献也是相关的。在 JLab 能量范围内，游戏中的参与者是当前夸克和无质量胶子的渐近机制尚未达到。人们必须依靠更有效的自由度来适应探头的规模。一个一致的画面，即“Partonic Non-Perturbative Regime”，正在出现。其各种组件的特性（经过修饰的传播子、有效耦合常数、夸克波函数、Regge 轨迹的形状等）为我们提供了与强子特性的各种联系。我将回顾该领域的现状，审视 JLab、SLAC 和 Hermes 当前的成就，并将评估更高能量的连续电子束所带来的未来发展。) 为我们提供各种强子性质的链接。我将回顾该领域的现状，审视 JLab、SLAC 和 Hermes 当前的成就，并将评估更高能量的连续电子束所带来的未来发展。) 为我们提供各种强子性质的链接。我将回顾该领域的现状，审视 JLab、SLAC 和 Hermes 当前的成就，并将评估更高能量的连续电子束所带来的未来发展。