Predictions for single spin asymmetries in
Predictions for single spin asymmetries in
复制标题
单自旋不对称性的预测
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Cagliari
中科院分区：
文献类型：
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作者：
M. Anselmino;M. Boglione;J. Hansson;F. M. University;Infn;Torino;Italy.;Vrije Universiteit;Amsterdam;The Netherlands.;Lulea University of Technology;Lulea;Sweden.;University;Cagliari
给出了半包含DIS过程中单横向自旋不对称性A_N的预言；A_N的不可忽略值可能是由于极化夸克碎裂成相对于喷注轴具有横向动量k_T的最终强子的自旋效应，即所谓的柯林斯效应。碎裂夸克的基本单自旋不对称性已在以前的一篇论文中通过对p(trv.极化)+P->；pion+X，并且这里给出的预测是基于柯林斯效应是在p(trv.)中观察到的单自旋不对称的唯一原因的假设。讨论了夸克分布函数中最终的自旋和k_T依赖关系，即所谓的Sivers效应。
Predictions for the single transverse spin asymmetry A_N in semi-inclusive DIS processes are given; non negligible values of A_N may arise from spin effects in the fragmentation of a polarized quark into a final hadron with a transverse momentum k_T with respect to the jet axis, the so-called Collins effect. The elementary single spin asymmetry of the fragmenting quark has been fixed in a previous paper, by fitting data on p(transv. polarized) + P -> pion + X, and the predictions given here are uniquely based on the assumption that the Collins effect is the only cause of the observed single spin asymmetries in p(transv. polarized) + p -> pion + X. Eventual spin and k_T dependences in quark distribution functions, the so-called Sivers effect, are also discussed.