标题： 核子上的宇称破坏介子电产反应 显示英文标题

标题： Parity violating pion electroproduction off the nucleon

摘要： 由于$\gamma$和$Z^0$交换之间的干涉产生的宇称破坏（PV）贡献，是在介子电产反应中对核子进行计算的。使用包含有效拉格朗日量的唯象模型来确定阈值和$\Delta(1232)$共振之间的能量区域所产生的不对称性。$\Delta$共振被当作 Rarita-Schwinger 场，并具有唯象的$N \Delta$转换电流。背景贡献由通常的 Born 项给出，使用赝矢量$\pi N$拉格朗日量。给出了不对称性的数值结果。 显示英文摘要

摘要： Parity violating (PV) contributions due to interference between $\gamma$ and $Z^0$ exchange are calculated for pion electroproduction off the nucleon. A phenomenological model with effective Lagrangians is used to determine the resulting asymmetry for the energy region between threshold and $\Delta(1232)$ resonance. The $\Delta$ resonance is treated as a Rarita-Schwinger field with phenomenological $N \Delta$ transition currents. The background contributions are given by the usual Born terms using the pseudovector $\pi N$ Lagrangian. Numerical results for the asymmetry are presented.