Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-12-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages. Presented at the XIV Workshop on High Energy Spin Physics, 20-24 Sept 2011, Dubna, Russia
Scientific paper
We discuss the possibility of non-minimal gauge invariance of transverse-momentum-dependent parton densities (TMDs) that allows direct access to the spin degrees of freedom of fermion fields entering the operator definition of (quark) TMDs. This is achieved via enhanced Wilson lines that are supplied with the spin-dependent Pauli term $\sim F^{\mu\nu}[\gamma_\mu, \gamma_\nu]$, thus providing an appropriate tool for the "microscopic" investigation of the spin and color structure of TMDs. We show that this generalization leaves the leading-twist TMD properties unchanged but modifies those of twist three by contributing to their anomalous dimensions. We also comment on Collins' recent criticism of our approach.
Cherednikov Igor O.
Karanikas Alexandros I.
Stefanis N. G.
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