Systematic phenomenological study of the cos2{phi} asymmetry in unpolarized semi-inclusive DIS
- Di.S.T.A., Universita del Piemonte Orientale 'A. Avogadro', and INFN, Gruppo Collegato di Alessandria, 15100 Alessandria (Italy)
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
We study the cos2{phi} azimuthal asymmetry in unpolarized semi-inclusive DIS, taking into account both the perturbative contribution (gluon emission and splitting) and the nonperturbative effects arising from intrinsic transverse motion and transverse spin of quarks. In particular we explore the possibility to extract from <cos2{phi}> some information about the Boer-Mulders function h{sub 1}{sup perpendicular}, which represents a transverse-polarization asymmetry of quarks inside an unpolarized hadron. Predictions are presented for the HERMES, COMPASS and JLab kinematics, where <cos2{phi}> is dominated by the kinematical higher-twist contribution, and turns to be of order of a few percent. We show that under reasonable assumptions a larger asymmetry in {pi}{sup -} production, compared to {pi}{sup +} production, would represent a signature of the Boer-Mulders effect.
- OSTI ID:
- 21250553
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 4; Other Information: DOI: 10.1103/PhysRevD.78.045022; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the cos2{phi} asymmetry
Boer-Mulders effect in unpolarized SIDIS: An analysis of the COMPASS and HERMES data on the $\cos 2 \phi$ asymmetry