Measurement of the Collins and Sivers asymmetries on transversely polarised protons
Measurement of the Collins and Sivers asymmetries on transversely polarised protons
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DOI：
10.1016/j.physletb.2010.08.001
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发表时间：
2010-05
影响因子：
4.4
通讯作者：
T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
中科院分区：
文献类型：
--
作者：
T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
横向偏振质子深度非弹性散射产生的带电强子的柯林斯和西弗斯不对称性已从 2007 年使用调谐在 160 GeV/c 的 CERN SPS μ 子束收集的数据中提取出来。当 Bjorken x 变量值较大时，正强子和负强子都观察到非零柯林斯不对称性，而正强子的 Sivers 不对称性在几乎所有测量的 x 范围内都略微为正。这些结果有力地支持了目前对这些不对称性在前旋夸克分布和碎裂函数方面的理论解释。
The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries are observed both for positive and negative hadrons while the Sivers asymmetry for positive hadrons is slightly positive over almost all the measured x range. These results strongly support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.