Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-10
Nucl.Phys.B795:409-427,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: some textual changes in the paper and corrections in references, to appear in Nucl. Phys. B
Scientific paper
10.1016/j.nuclphysb.2007.11.024
In the field theoretical description of hadronic scattering processes, single transverse-spin asymmetries arise due to gluon initial and final state interactions. These interactions lead to process dependent Wilson lines in the operator definitions of transverse momentum dependent parton distribution functions. In particular for hadron-hadron scattering processes with hadronic final states this has important ramifications for possible factorization formulas in terms of (non)universal TMD parton distribution functions. In this paper we will systematically separate the universality-breaking parts of the TMD parton correlators from the universal T-even and T-odd parts. This might play an important role in future factorization studies for these processes. We also show that such factorization theorems will (amongst others) involve the gluonic pole cross sections, which have previously been shown to describe the hard partonic scattering in weighted spin asymmetries.
Bomhof C. J.
Mulders Piet J.
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