Electroweak interactions and relativistic many-body problems

提出的研究重点是两个相关的程序-电磁和弱相互作用，以及核多体问题的相对论方法。第一个研究计划的一个主要方面是通过与半光子探针的电磁和弱相互作用来理解核子和原子核的基本性质。在核子水平上，双光子交换（TPE）辐射修正的计算有助于解决使用Rosenbluth和极化转移技术测量电子-核子散射形状因子之间的差异。采用强子方法来评估模型相关的TPE振幅，包括核子共振的贡献。这对违反宇称的电子散射和其他精密测量（例如单自旋不对称）以及虚拟康普顿散射都有影响。一个目标是理解低能强子方法和适合高能的部分子方法之间的转变。

The proposed research focuses on two related programs -- electromagnetic and weak interactions, and relativistic approaches to the nuclear many-body problem. A principle aspect of the first research program is understanding the fundamental properties of nucleons and nuclei through electromagnetic and weak interactions with semileptonic probes. At the nucleon level, calculations of two-photon exchange (TPE) radiative corrections have been instrumental in resolving the discrepancy between measurements of electron-nucleon scattering form factors using Rosenbluth and polarization transfer techniques. A hadronic approach is taken to evaluating the model-dependent TPE amplitudes, including the contribution of nucleon resonances. This has implications for parity-violating electron scattering and other precision measurements (e.g. single spin asymmetries), as well as virtual Compton scattering. One goal is understanding the transition between hadronic approaches at low energies and partonic approaches appropriate at high energies.