Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum

Understand

We investigate the transverse-momentum-dependence in semi-inclusive deep inelastic leptoproduction of hadrons.

• There are two different theoretical approaches to study this dependence, one for low and one for high transverse momentum of the observed hadron.
• We systematically investigate their connection, paying special attention to azimuthal distributions and to polarization dependence.
• In the region of intermediate transverse momentum, where both approaches are applicable, we find that their results match for certain observables but not for others.