Work

On the cos 2 ϕ asymmetry in unpolarized leptoproduction

Year: 2005

Type: article

Abstract: We investigate the origin of the cos2ϕ azimuthal asymmetry in unpolarized semi-inclusive DIS. The contributions to this asymmetry arising from the intrinsic transverse motion of quarks are explicitly evaluated, and predictions for the HERMES and COMPASS kinematic regimes are presented. We show that the effect of the leading-twist Boer–Mulders function h1⊥(x,kT2), which describes a correlation between the transverse momentum and the transverse spin of quarks, is quite significant and may also account for a part of the cos2ϕ asymmetry measured by ZEUS in the perturbative domain.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2005.10.016

Authors: Vincenzo Barone, Zhun Lu, Bo-Qiang Ma

Institutions: Università degli Studi del Piemonte Orientale “Amedeo Avogadro”, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Alessandria, Peking University

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid:

Funders: National Natural Science Foundation of China, Ministry of Education of the People's Republic of China, Ministero dell’Istruzione, dell’Università e della Ricerca