Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT,
Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT,
复制标题
高 pT 下单强子准实光产生中的纵向双自旋不对称性，
DOI：
10.1016/j.physletb.2015.12.035
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
C.Adolph et al.
中科院分区：
文献类型：
--
作者：
Francesco Buscemi;Michele Dall'Arno;Masanao Ozawa;and Vlatko Vedral;C.Adolph et al.
在1GeV/c到4GeV/c的横向强子动量pT范围内，测量了在光子虚度为q2<；1(GeV/c)2时，单强子单强子产生的纵向双自旋不对称性ALL。它们是用160GeV/c或200GeV/c的极化Muon束撞击极化的6LiD或NH3靶所获得的指南针数据。实验中的不对称性与次序pQCD计算进行了比较，并且在胶子携带的核子动量分数范围内对核子内部的胶子极化ΔG很敏感。
We measured the longitudinal double spin asymmetries A LL for single hadron muoproduction off protons and deuterons at photon virtuality Q 2< 1 (GeV/c) 2 for transverse hadron momenta p T in the range 1 GeV/c to 4 GeV/c. They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised 6 LiD or NH 3 targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation ΔG inside the nucleon in the range of the nucleon momentum fraction carried by gluons 0.05< x g< 0.2.