标题： 重新审视规范不变性与介子交换的Regge化 显示英文标题

标题： Revisiting gauge invariance and Reggeization of pion exchange

摘要： 在高能轻介子光致反应中，预期规度化的π介子将对正向截面提供主要贡献，该反应涉及电荷交换。 我们讨论带电π介子光致反应中π介子交换的规度化，并着重于与电流守恒的一致性。 我们表明，在$t$-通道中交换具有通用偶数自旋$J\geq 2$的粒子的规范不变振幅在$J=0$处是解析的，并且可以解释为核子电流。 这使我们能够将涉及核子交换的$s$-和$u$-通道的动力学与根据 Regge 理论要求用$t$-通道部分波表示的振幅协调一致。 显示英文摘要

摘要： The Reggeized pion is expected to provide the main contribution to the forward cross section in light meson photoproduction reactions with charge exchange at high energies. We discuss the Reggeization of pion exchange in charged pion photoproduction with an emphasis on consistency with current conservation. We show that the gauge-invariant amplitude for the exchange of a particle with generic even spin $J\geq 2$ in the $t$-channel is analytic at $J=0$, and that it can be interpreted in terms of the nucleon electric current. This enables us to reconcile the dynamics in the $s$- and $u$-channel, which involves also nucleon exchanges, with the amplitude expressed in terms of $t$-channel partial waves, as required by Regge theory.