QCD predictions for the azimuthal asymmetry in charm leptoproduction for the COMPASS kinematics

被引：5

作者：

Efremov, A. V. ^{[1
]}

Ivanov, N. Ya. ^{[2
]}

Teryaev, O. V. ^{[1
]}

机构：

[1] JINR, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

[2] Yerevan Phys Inst, Alikhanian Br 2, Yerevan 0036, Armenia

来源：

PHYSICS LETTERS B | 2017年 / 772卷

关键词：

QCD; Charm leptoproduction; Azimuthal asymmetry; COMPASS; SINGLE SPIN ASYMMETRY; F-L/F-T; PERTURBATIVE STABILITY; RATIO R; HEAVY; PROBE; DIS;

D O I：

10.1016/j.physletb.2017.06.057

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the QCD predictions for the azimuthal cos 2 phi asymmetry in charm leptoproduction for the kinematics of the COMPASS experiment at CERN. The asymmetry is predicted to be large, about 15%. The radiative corrections to the QCD predictions for the cos2 phi distribution are estimated to be small, less than 10%. Our calculations show that the azimuthal asymmetry in charm production is well defined in pQCD: it is stable both perturbatively and parametrically, and practically insensitive to theoretical uncertainties in the input parameters. We analyze the nonperturbative contributions to the cos 2 phi distribution due to the gluon transverse motion in the target and the c-quark fragmentation. Because of the c-quark low mass, the nonperturbative contributions are expected to be sizable, about (30-40)%. We conclude that extraction of the azimuthal asymmetries from available COMPASS data will provide valuable information about the transverse momentum dependent distribution of the gluon in the proton and the c-quark hadronization mechanism. Finally, we discuss the cos 2 phi asymmetry as a probe of the gluonic analogue of the Boer-Mulders function, h(vertical bar)/(g)(1), describing the linear polarization of gluons inside unpolarized proton. (C) 2017 The Author(s). Published by Elsevier B.V.

引用

页码：283 / 289

页数：7

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