双玻色子交换效应与N/π/Δ(1232)形状因子、Qweak及Vud的精确测量

基本物理学量的精确测量是基础物理研究中长期的热点和重点，N/π/Δ(1232)形状因子、Qweak和Vud 是核物理与标准模型中的几个基本物理量，当前实验主要是通过测量ep->ep、ep ->enπ+/epπ0和中子β衰变等过程的微分截面来拟合得到它们的具体值。近几年实验对这几道的测量精度有极大提高，这相应要求理论方面有大致相当精度的计算拟合，具体地是要求对以上过程中的辐射修正(圈图修正)有更精确的估算。至今这些辐射修正中最重要、最不确定而又最缺乏研究的是涉及核子结构的双玻色子交换效应。在此背景下，课题组结合前期研究基础和当前国际上研究热点与空白，提出计划系统研究ep->ep、ep->enπ+/epπ0、中子β衰变等实验过程中的双玻色子交换效应及其对N/π/Δ(1232)形状因子、Qweak和Vud精确测量的影响。

Precise measurements of elemental physical quantities are important and hot topic in elemental physics,the form factors of N/π/Δ(1232), Qweak and Vud are such quantities in nuclear physics and standard model. Up to now, the main methods to extract these qunatities are by measureing cross sections of ep->ep、ep ->enπ+/epπ0 andβdecay. Due to the improvement of experimental precision in these reactions, the more precise calculations of radiative corrections are requied. Among these radiative corrections, the two-boson exchange effects play the most important roles. Based on this situation and our prevenient research, we propose to systematically study the two-boson exchange effects in ep-> ep,ep->enπ+/epπ0,β decay of neutron and their corrections to the precise extractions of N/π/Δ(1232))'s form factors,Qweak and Vud.