标题： 核子在极化半事例深度非弹性散射中的介子云 显示英文标题

标题： Meson Cloud of the Nucleon in Polarized Semi-Inclusive Deep-Inelastic Scattering

摘要： 我们研究通过测量在极化质子上的深度非弹性轻子产生中产生的极化$\Delta^{++}$重子碎片来识别核子的显式介子组分的可能性，这可能有助于识别导致Gottfried求和规则破坏的物理机制。 介子交换模型预测$\Delta^{++}$和靶质子的极化高度相关，这与竞争的二夸克碎片过程形成鲜明对比。 对极化$\Lambda$产生中的不对称性进行测量也可能揭示核子中存在奇异云。 显示英文摘要

摘要： We investigate the possibility of identifying an explicit pionic component of the nucleon through measurements of polarized $\Delta^{++}$ baryon fragments produced in deep-inelastic leptoproduction off polarized protons, which may help to identify the physical mechanism responsible for the breaking of the Gottfried sum rule. The pion-exchange model predicts highly correlated polarizations of the $\Delta^{++}$ and target proton, in marked contrast with the competing diquark fragmentation process. Measurement of asymmetries in polarized $\Lambda$ production may also reveal the presence of a kaon cloud in the nucleon.