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Title
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Anomalous dimensions of transverse-momentum dependent parton distribution functions
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Author
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Abstract
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| We discuss recent developments in the understanding of gauge-invariant transverse-momentum dependent (TMD) parton-distribution functions (PDF). We compute the leading-order MS¯¯¯¯¯-scheme anomalous dimension of such a quantity in the light-cone gauge and show that it receives a contribution that can be associated with a cusp obstruction at transverse light-cone infinity. This anomalous dimension is intimately related to expectation values composed of fields and eikonal factors along a cusped contour and is absent in covariant gauges. The implications of these findings are addressed and a modified definition of TMD PDFs is proposed. |
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Language
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English
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Source (journal)
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a
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Publication
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2008
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Volume/pages
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(2008)
, p. 1-7
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Full text (publisher's version - intranet only)
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