On the cos2φ asymmetry in unpolarized leptoproduction

Vincenzo Barone; Zhun Lu; Bo Qiang Ma

doi:10.1016/j.physletb.2005.10.016

On the cos2φ asymmetry in unpolarized leptoproduction

Vincenzo Barone
, Zhun Lu
, Bo Qiang Ma

Department of Science and Technological Innovation

Research output: Contribution to journal › Article › peer-review

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,k_T²), 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.

Original language	English
Pages (from-to)	277-281
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	632
Issue number	2-3
DOIs	https://doi.org/10.1016/j.physletb.2005.10.016
Publication status	Published - 12 Jan 2006

Keywords

Azimuthal asymmetries
Semi-inclusive DIS
Transverse spin
k-dependent distribution functions

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10.1016/j.physletb.2005.10.016

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title = "On the cos2φ asymmetry in unpolarized leptoproduction",

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.",

keywords = "Azimuthal asymmetries, Semi-inclusive DIS, Transverse spin, k-dependent distribution functions",

author = "Vincenzo Barone and Zhun Lu and Ma, \{Bo Qiang\}",

note = "Funding Information: We are grateful to Alexei Prokudin and Franco Bradamante for useful discussions. This work is partially supported by the National Natural Science Foundation of China (No. 10421003), by the Key Grant Project of the Chinese Ministry of Education (No. 305001), and by the Italian Ministry of Education, University and Research (PRIN 2003).",

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doi = "10.1016/j.physletb.2005.10.016",

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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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TY - JOUR

T1 - On the cos2φ asymmetry in unpolarized leptoproduction

AU - Barone, Vincenzo

AU - Lu, Zhun

AU - Ma, Bo Qiang

N1 - Funding Information: We are grateful to Alexei Prokudin and Franco Bradamante for useful discussions. This work is partially supported by the National Natural Science Foundation of China (No. 10421003), by the Key Grant Project of the Chinese Ministry of Education (No. 305001), and by the Italian Ministry of Education, University and Research (PRIN 2003).

PY - 2006/1/12

Y1 - 2006/1/12

N2 - 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.

AB - 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.

KW - Azimuthal asymmetries

KW - Semi-inclusive DIS

KW - Transverse spin

KW - k-dependent distribution functions

UR - https://www.scopus.com/pages/publications/29144521392

U2 - 10.1016/j.physletb.2005.10.016

DO - 10.1016/j.physletb.2005.10.016

M3 - Article

SN - 0370-2693

VL - 632

SP - 277

EP - 281

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 2-3

ER -

On the cos2φ asymmetry in unpolarized leptoproduction

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