Pion transverse momentum dependent parton distributions in a light-front constituent approach, and the Boer-Mulders effect in the pion-induced Drell-Yan process

被引：58

作者：

Pasquini, B. ^{[1
,2
]}

Schweitzer, P. ^{[3
]}

机构：

[1] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy

[2] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[3] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA

来源：

PHYSICAL REVIEW D | 2014年 / 90卷 / 01期

基金：

美国国家科学基金会;

关键词：

FINAL-STATE INTERACTIONS; SINGLE-SPIN ASYMMETRIES; DEEP-INELASTIC-SCATTERING; LEPTON-PAIR PRODUCTION; CHARGE FORM-FACTORS; ANGULAR-DISTRIBUTIONS; MUON PAIRS; AZIMUTHAL ASYMMETRY; DILEPTON PRODUCTION; QCD CORRECTIONS;

D O I：

10.1103/PhysRevD.90.014050

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

At leading twist the transverse momentum dependent parton distributions of the pion consist of two functions, the unpolarized f(1,x)(x,k(perpendicular to)(2)) and the Boer-Mulders function h(1,x)(perpendicular to)(x, k(perpendicular to)(2)) We study both functions within a light-front constituent model of the pion, comparing the results with different pion models and the corresponding nucleon distributions from a light- front constituent model. After evolution from the model scale to the relevant experimental scales, the results for the collinear pion valence parton distribution function f(1,x)(x) are in very good agreement with available parametrizations. Using the light-front constituent model results for the Boer-Mulders functions of the pion and nucleon, we calculate the coefficient nu in the angular distribution of Drell-Yan dileptons produced in pion-nucleus scattering, which is responsible for the violation of the Lam-Tung relation. We find a good agreement with the data, and carefully discuss the range of applicability of our approach.

引用

页数：21

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