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Title
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Spin microscopy with enhanced Wilson lines in the TMD parton densities
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Author
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Abstract
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| 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 ∼Fμν[γμ,γν], 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. Comments: 4 pages. Presented at the XIV Workshop on High Energy Spin Physics, 20-24 Sept 2011, Dubna, Russia Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Lattice (hep-lat) |
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Language
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English
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Source (journal)
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arXiv
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Publication
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2011
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Volume/pages
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(2011)
, p. 1-4
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Medium
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E-only publicatie
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Full text (publisher's version - intranet only)
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