Boer-Mulders function of the pion and pretzelosity distribution of the proton in the polarized pion-proton Drell-Yan process at COMPASS

被引：1

作者：

Liu, Xiaonan ^{[1
,2
]}

Ma, Bo-Qiang ^{[1
,2
,3
,4
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2021年 / 81卷 / 07期

基金：

中国国家自然科学基金;

关键词：

PARTON DISTRIBUTIONS; MELOSH ROTATION; QUARKS; SPIN; ASYMMETRIES; SCATTERING; MODEL;

D O I：

10.1140/epjc/s10052-021-09457-2

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present a phenomenological analysis of the qT-weighted transverse spin dependent azimuthal asymmetry recently measured by the COMPASS Collaboration in polarized pion-proton Drell-Yan process. In the kinematical regimes explored by experiments, we consider the leading-twist contributions from the Boer-Mulders distribution functions h(1)(perpendicular to)(x,k(T)(2)) of both the pion and the proton, the transversity distribution h(1)(x,k(T)(2)) and the pretzelosity distribution h(1T)(perpendicular to)(x,k(T)(2)) of the proton, with the unpolarized transverse-momentum-dependent distribution function f1(x,k(T)(2)) of the proton being also involved in the calculation. By comparing the data reported by the COMPASS Collaboration with theoretical calculated results, we find that the COMPASS measurements represent the first experimental evidence of the Boer-Mulders effect in polarized Drell-Yan process. We also test the universality between proton and pion Boer-Mulders functions.

引用

页数：11

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