Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 6 figures; expanded discussion of kinematics and new scaling variable; appendix comparing collinear frames included;
Scientific paper
We derive mass corrections for semi-inclusive deep inelastic scattering of leptons from nucleons using a collinear factorization framework which incorporates the initial state mass of the target nucleon and the final state mass of the produced hadron. The formalism is constructed specifically to ensure that physical kinematic thresholds for the semi-inclusive process are explicitly respected. A systematic study of the kinematic dependencies of the mass corrections to semi-inclusive cross sections reveals that these are even larger than for inclusive structure functions, especially at very small and very large hadron momentum fractions. The hadron mass corrections compete with the experimental uncertainties at kinematics typical of current facilities, and will be important to efforts at extracting parton distributions or fragmentation functions from semi-inclusive processes at intermediate energies.
Accardi Alberto
Hobbs Timothy
Melnitchouk Wally
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