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 - http://www.scopus.com/inward/record.url?scp=29144521392&partnerID=8YFLogxK
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 -