Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-18
Phys.Rev.D78:045022,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 12 figures
Scientific paper
10.1103/PhysRevD.78.045022
We study the $\cos 2 \phi$ azimuthal asymmetry in unpolarized semi-inclusive DIS, taking into account both the perturbative contribution (gluon emission and splitting) and the non perturbative effects arising from intrinsic transverse motion and transverse spin of quarks. In particular we explore the possibility to extract from $<\cos 2 \phi>$ some information about the Boer--Mulders function $h_1^{\perp}$, which represents a transverse--polarization asymmetry of quarks inside an unpolarized hadron. Predictions are presented for the HERMES, COMPASS and JLab kinematics, where $<\cos 2 \phi>$ is dominated by the kinematical higher--twist contribution, and turns to be of order of few percent. We show that a larger asymmetry in $\pi^-$ production, compared to $\pi^+$ production, would represent a signature of the Boer--Mulders effect.
Barone Vincenzo
Ma Bo-Qiang
Prokudin Alexei
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