Investigations of azimuthal asymmetry in semi-inclusive leptoproduction
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We consider the azimuthal asymmetries in semi-inclusive deep inelastic leptoproduction arising due to both perturbative and nonperturbative effects at HERMES energies and show that the \(k_T^2/Q^2\) order corrections to \(\langle \cos\phi \rangle\) and \(\langle \cos2\phi \rangle\) are significant. We also reconsider the results of perturbative effects for \(\langle \cos\phi \rangle\) at large momentum transfers  using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to 18% difference in \(\langle \cos\phi \rangle\). In the same approach we calculate the \(\langle \cos2\phi \rangle\) as well.
KeywordsMomentum Transfer Order Correction Fragmentation Function Large Momentum Large Momentum Transfer
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