Gutierrez-Reyes, Daniel and Scimemi, Ignazio and Vladimirov, Alexey A. (2017) Twist-2 matching of transverse momentum dependent distributions. PHYSICS LETTERS B, 769. pp. 84-89. ISSN 0370-2693, 1873-2445
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We systematically study the large-qT (or small-b) matching of transverse momentum dependent (TMD) distributions to the twist-2 integrated parton distributions. Performing operator product expansion for a generic TMD operator at the next-to-leading order (NLO) we found the complete set of TMD distributions that match twist-2. These are unpolarized, helicity, transversity, pretzelosity and linearly polarized gluon distributions. The NLO matching coefficients for these distributions are presented. The pretzelosity matching coefficient is zero at the presented order, however, it is evident that it is non-zero in the following orders. This result offers a natural explanation of the small value of pretzelosity found in phenomenological fits. We also demonstrate that the cancellation of rapidity divergences by the leading order soft factor imposes the necessary requirement on the Lorentz structure of TMD operators, which is supported only by the TMD distributions of leading dynamical twist. Additionally, this requirement puts restrictions on the gamma(5)-definition in the dimensional regularization. (C) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PARTON DISTRIBUTIONS; RENORMALIZATION; REGULARIZATION; EVOLUTION; HELICITY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:10 |
| Last Modified: | 15 Feb 2019 11:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/703 |
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