Title
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Linearly polarized small-x gluons in forward heavy-quark pair production
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Author
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Abstract
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We use the color glass condensate (CGC) framework to study the production of forward heavy quark-antiquark pairs in unpolarized proton-nucleus or proton-proton collisions in the small-x regime. In the limit of nearly back-to-back jets, the CGC result simplifies into the transverse-momentum dependent (TMD) factorization approach. For massless quarks, the TMD factorization formula involves three unpolarized gluon TMDs: the Weizsacker-Williams gluon distribution, the adjoint-dipole gluon distribution, and an additional one. When quark masses are kept nonzero, three new gluon TMDs appear-each partnered to one of the aforementioned distributions-which describe the distribution of linearly polarized gluons in the unpolarized small-x target. We show how these six gluon TMDs emerge from the CGC formulation, and we determine their expressions in terms of Wilson line correlators. We calculate them analytically in the McLerran-Venugopalan model, and further evolve them toward smaller values of x using a numerical implementation of Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner (JIMWLK) evolution. |
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Language
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English
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Source (journal)
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PHYSICAL REVIEW D
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Publication
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2018
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DOI
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10.1103/PHYSREVD.97.014004
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Volume/pages
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97
:1
(2018)
, 16 p.
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Article Reference
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014004
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ISI
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000423125300001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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