标题： 高自旋费米子场的相容相互作用 显示英文标题

标题： Consistent interactions for high-spin fermion fields

摘要： 我们解决任意自旋的非壳上费米子场的一致相互作用问题。 这些相互作用在强子过程中高自旋重子共振的量子强子动力学描述中起着关键作用。 高自旋费米子场的Rarita-Schwinger描述涉及与它们的低自旋内容相关的非物理自由度。 如果未彻底消除这些自由度，它们会进入相互作用。 在无约束的Rarita-Schwinger规范下相互作用的不变性条件消除了费米子传播子的低自旋内容，并导致相互作用的一致描述。 我们开发了高自旋费米子最一般的一致相互作用结构。 我们发现，一致相互作用的动量依赖性的强度随着费米子场的自旋增加而增加。 当用标准强子形式因子截断短距离物理时，这会导致计算的截面能量依赖性中出现非物理结构。 提出了一种新颖的、与自旋相关的强子形式因子，以抑制这些非物理伪影。 显示英文摘要

摘要： We address the issue of consistent interactions for off-shell fermion fields of arbitrary spin. These interactions play a crucial role in the quantum hadrodynamical description of high-spin baryon resonances in hadronic processes. The Rarita-Schwinger description of high-spin fermion fields involves unphysical degrees of freedom, associated with their lower-spin content. These enter the interaction if not eliminated outright. The invariance condition of the interaction under the unconstrained Rarita-Schwinger gauge removes the lower-spin content of the fermion propagator and leads to a consistent description of the interaction. We develop the most general, consistent interaction structure for high-spin fermions. We find that the power of the momentum dependence of a consistent interaction rises with the spin of the fermion field. This leads to unphysical structures in the energy dependence of the computed cross sections when the short-distance physics is cut off with standard hadronic form factors. A novel, spin-dependent hadronic form factor is proposed that suppresses the unphysical artifacts.