摘要
利用夸克-双夸克模型和优势碎裂函数,描述在横向极化部分子分布函数研究中的重要分析量Collins moment。在HERMES实验中,非极化正负电子束在横向极化氢靶上进行半单举深度非弹性散射,会产生正负π介子;通过理论模型计算,并针对HERMES实验的动力学参量范围(0.023<x<0.4,0.1<y<0.85,0.2<xF<0.7),给出了正负π介子产物的Collins moment与费曼变量之间关系的理论预言。
Collins moment is described with quark-diquark model and favored fragmentation functions, which is the analyzing power in the research of the transversity parton distribution function. With model calculations, theoretical predictions on the relation between Collins moment and Feynman variable, are given for charged pion production in semi-inclusive deep inelastic scattering of unpolarized charged lepton beams on transversely polarized hydrogen targets, in the kinematic range of the HERMES experiments. The kinematic range covered is 0.023 〈 x 〈 0. 4,0.1 〈 y 〈0. 85 and 0.2 〈 xy 〈0. 7.
出处
《北京大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期195-198,共4页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金资助项目(10675004)
关键词
核子自旋结构
部分子分布函数
横向极化
nucleon spin structure
parton distribution function
transversity
