Boer-Mulders function of the pion and the qT-weighted cos 2φ asymmetry in the unpolarized π-p Drell-Yan process at COMPASS

被引：2
|
作者：
Wang, Zhengxian [1 ]
Wang, Xiaoyu [1 ]
Lu, Zhun [1 ]
机构：
[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China
来源：
PHYSICAL REVIEW D | 2017年 / 95卷 / 09期
基金：
中国国家自然科学基金;
关键词：
FINAL-STATE INTERACTIONS; LEPTON-PAIR PRODUCTION; AZIMUTHAL ASYMMETRIES; ANGULAR-DISTRIBUTIONS; SPIN ASYMMETRIES; SIVERS FUNCTION; PARTON DISTRIBUTIONS; TRANSVERSE-MOMENTUM; ODD DISTRIBUTION; QCD EVOLUTION;
D O I：
10.1103/PhysRevD.95.094004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the two leading-twist transverse momentum dependent distribution functions of the pion meson, the unpolarized distribution f(1 pi)(x, k(T)(2)) and the Boer-Mulders function h(1 pi)(perpendicular to) (x,k(T)(2)), using the pion wave functions derived from a light-cone approach. The evolution effect of the first k(T)-moment of the pion Boer-Mulders function is studied by employing an approximate evolution kernel. Using the model resulting distributions, we predict the transverse momentum weighted cos 2 phi azimuthal asymmetry in the unpolarized pi(-) p Drell-Yan process which can be measured at COMPASS in the near future.
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页数：10
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