Electroweak interactions and relativistic many-body problems

电弱相互作用和相对论多体问题

• 批准号: 156206-2008
• 负责人: Blunden, Peter
• 金额: $ 3.28万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=476125
• 关键词: Electroweak; interactions; relativistic; many; body

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.

拟议的研究集中于两个相关计划 - 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电磁和弱相互作用与半抑制探针了解核和核的基本特性。在核子水平上，使用Rosenbluth和极化转移技术解决了两光子交换（TPE）辐射校正的计算对解决电子核子散射形式的测量值的差异发挥了作用。采用了一种望态方法来评估依赖模型的TPE振幅，包括核子共振的贡献。这对平等侵入电子散射和其他精度测量（例如单个自旋不对称）以及虚拟康普顿散射具有影响。一个目标是理解低能能下的耐药方法和在高能下适当的党派方法之间的过渡。