论文标题
束旋转不对称的强子对半封闭式电源构造
Beam spin asymmetry in semi-inclusive electroproduction of a hadron pair
论文作者
论文摘要
据报道,据报道,纵向束旋转不对称ALU的第一个测量在两对带电亲的半封闭电源中。 Alu是一种可观察到的高速扭转,可提供对Nucleon Twist-3 Parton分布函数E(X)的最清洁访问。在杰斐逊实验室的Hall-B中收集了数据,该数据是通过在液体液目标上撞击5.498 GEV电子束,并用CLAS检测器重建了散射的电子和Pion对。为Quark区域中感兴趣的运动学变量提取了ALU的罪分(PHIR)矩的一维投影。对Di-Hadron产生的理解对于在半包容性DIS中的单个强子产生中的观察物产生的解释以及Di-Hadron生产中单个旋转不对称的开创性测量为QCD动力学研究开辟了新的途径。
A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498 GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the sin(phiR) moments of ALU are extracted for the kinematic variables of interest in the valence quark region. The understanding of di-hadron production is essential for the interpretation of observables in single hadron production in semi-inclusive DIS, and pioneering measurements of single spin asymmetries in di-hadron production open a new avenue in studies of QCD dynamics.