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HK: Fachverband Hadronen und Kerne
HK 81: Hadron Structure and Spectroscopy II
HK 81.2: Talk
Friday, March 20, 2009, 11:15–11:30, H-ZO 30
azimuthal asymmetries of the unpolarized cross-section at HERMES — •francesca giordano — INFN sez. ferrara, ferrara, italy
in unpolarized semi-inclusive deep inelastic scattering azimuthal cosφ and cos2φ modulations of the hadron distributions originate from quark intrinsic transverse momentum and transverse spin.
these azimuthal modulations are extracted from data of the HERMES experiment corrected for instrumental and radiative contributions by a multidimensional (x,y,z,Ph⊥) unfolding procedure.
to access flavor dependent informations about quark intrinsic transverse momenta and spin-orbit correlations, results are presented for hydrogen and deuterium targets and separately for positive and negative hadrons. this flavor sensitivity of the results enhances the discrimination power between the theoretical models in the HERMES kinematical regime.