کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1843200 | 1527751 | 2010 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Wilson lines in transverse-momentum dependent parton distribution functions with spin degrees of freedom
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
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چکیده انگلیسی
We propose a new framework for transverse-momentum dependent parton distribution functions, based on a generalized conception of gauge invariance which includes into the Wilson lines the Pauli term â¼Fμν[γμ,γν]. We discuss the relevance of this nonminimal term for unintegrated parton distribution functions, pertaining to spinning particles, and analyze its influence on their renormalization-group properties. It is shown that while the Pauli term preserves the probabilistic interpretation of twist-two distributions-unpolarized and polarized-it gives rise to additional pole contributions to those of twist-three. The anomalous dimension induced this way is a matrix, calling for a careful analysis of evolution effects. Moreover, it turns out that the crosstalk between the Pauli term and the longitudinal and the transverse parts of the gauge fields, accompanying the fermions, induces a constant, but process-dependent, phase which is the same for leading and subleading distribution functions. We include Feynman rules for the calculation with gauge links containing the Pauli term and comment on the phenomenological implications of our approach.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 840, Issues 1â2, 21 November 2010, Pages 379-404
Journal: Nuclear Physics B - Volume 840, Issues 1â2, 21 November 2010, Pages 379-404
نویسندگان
I.O. Cherednikov, A.I. Karanikas, N.G. Stefanis,