HER MES上深度非弹过程中纵向自旋转移的处理方法  

Methods to Extract Spin Transfer in DIS at HER MES

作　　者：吕海江[1] 叶云秀[1] 叶震宇[1] 冒亚军[2] 马伯强[2] 

机构地区：[1]中国科学技术大学近代物理系 [2]北京大学物理学院,北京100871

出　　处：《中国科学技术大学学报》2005年第5期613-619,共7页JUSTC

基　　金：面向21世纪教育振兴行动计划(YL1365000001)

摘　　要：为了得到HERMES(德国DESY实验室)实验装置上的深度非弹散射过程中产生的Λ粒子的极化信息,探知核子中夸克自旋的分布及转移,建立了一种能消除对该分析结果有很大影响的接收度的不均匀性的新方法,即归一法;此外,对由匹兹堡组新提出的螺旋度平衡法作了改进并加以论证.并将两种新方法与依赖模拟的蒙特卡洛方法螺旋度平衡法作了比较.To measure the longitudinal spin transfer to A produced in polarized e-p deep inelastic scattering（DIS） at HERMES spectrometer on HERA in DESY, a normalization method（NM） was established to cancel the acceptance correction, which has a great effect on the analysis of the polarization of A hyperons. The method, based on two opposite polarized positron beam data sets, can extract the spin transfer by canceling the acceptance correction with a dividing algorithm. Furthermore, another new method named helicity balance method（HBM） was improved based on two special opposite polarized positron beam data sets. Both methods are proved to be correct through the analysis of Monte Carlo （MC） data. As a comparison, the MC method is used to extract the spin transfer at the same time.

关 键 词：极化 自旋转移 接收度 归一法 螺旋度平衡法 

分 类 号：O572.21[理学—粒子物理与原子核物理]