利用低能电子与正电子-核子散射探索手征动力学
Exploring chiral dynamics with low-energy electron- and positron-nucleon scattering
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中文总结 AI 辅助
该研究探讨利用实验室能量≤500 MeV的电子与正电子-核子散射，研究QCD重子区手征动力学、双光子交换效应及核子广义极化率等相关物理问题。
中文摘要 AI 辅助
低能轻子-核子散射可探测量子色动力学（QCD）重子区的长程动力学多种表现形式，该动力学由手征对称性破缺与Δ共振主导。本文探讨了在实验室能量E_{e±}≤500 MeV下，结合电子与正电子-核子散射可开展的若干具体研究，包括：（a）低Q²核子弹性形状因子中的手征动力学（外围电荷与电流密度）；（b）靶法线单自旋不对称性及弹性与含散射（Δ激发）中束流电荷不对称性的双光子交换效应；（c）含束流电荷不对称性测量的虚康普顿散射中的核子广义极化率。
英文摘要
Low-energy lepton-nucleon scattering probes various expressions of the long-distance dynamics in the baryon sector of QCD, governed by chiral symmetry breaking and the $Δ$ resonance. We discuss some specific studies that could be performed with combined electron- and positron-nucleon scattering at lab energies $E_{e\pm} \lesssim$ 500 MeV. They include: (a) chiral dynamics in the low-$Q^2$ nucleon elastic form factors (peripheral charge and current densities); (b) two-photon exchange effects in the target normal single-spin asymmetry and beam charge asymmetry in elastic and inclusive scattering ($Δ$ excitation); (c) nucleon generalized polarizabilities in virtual Compton scattering with beam charge asymmetry measurements.
