New results on transverse spin asymmetries from COMPASS
New results on transverse spin asymmetries from COMPASS
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COMPASS 横向自旋不对称性的新结果
DOI：
10.1051/epjconf/20158502019
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
B. Parsamyan
中科院分区：
文献类型：
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作者：
B. Parsamyan
COMPASS实验的重要目标之一是通过偏振轻子（很快还有与横向偏振目标的Drell-Yan（DY）反应）的半包容深度非弹性散射（SIDIS）中自旋（不）相关的方位不对称性来探索核子的横向自旋结构。为此，在 COMPASS 中使用 160 GeV/c 纵向偏振 μ 子束和偏振 6 LiD 和 NH3 目标进行了一系列测量，并预计在偏振 NH3 上使用 190 GeV/c 光束。 COMPASS在SIDIS中获得的方位角效应实验结果对于核子三维性质的一般理解发挥着重要作用，并广泛应用于理论分析和全局数据拟合。未来首个来自 COMPASS 的偏振 DY 数据与 SIDIS 结果的比较将开启探索 QCD TMD 形式主义一般原理的新篇章。在这篇综述中，主要关注的是从四个“Drell-Yan”Q 2 范围中获得的 SIDIS 横向自旋不对称性的最新 COMPASS 结果。
One of the important objectives of the COMPASS experiment is the exploration of transverse spin structure of nucleon via spin (in)dependent azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS) of polarized leptons (and soon also Drell-Yan (DY) reactions with ) o trans- versely polarized target. For this purpose a series of measurements were made in COMPASS, using 160 GeV/c longitudinally polarized muon beam and polarized 6 LiD and NH3 targets and are foreseen with 190 GeV/c beam on polarized NH3. The experimental results obtained by COMPASS for az- imuthal e ects in SIDIS play an important role in the general understanding of the three-dimensional nature of the nucleon and are widely used in theoretical analyses and global data fits. Future first ever polarized DY-data from COMPASS compared with SIDIS results will open a new chapter probing gen- eral principles of QCD TMD-formalism. In this review main focus will be given to the very recent COMPASS results obtained for SIDIS transverse spin asymmetries from four "Drell-Yan" Q 2 -ranges.