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    Quark-gluon vertex from Nf=2 lattice QCD


    Kızılersü, Ayşe and Oliveira, Orlando and Silva, Paulo J. and Skullerud, Jon-Ivar and Sternbeck, André (2021) Quark-gluon vertex from Nf=2 lattice QCD. Physical Review D, 103 (11). 114515-11-114515-21. ISSN 2470-0010

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    Abstract

    We study the quark-gluon vertex in the limit of vanishing gluon momentum using lattice QCD with two flavors of O(a) improved Wilson fermions, for several lattice spacings and quark masses. We find that all three form factors in this kinematics have a significant infrared strength and that both the leading form factor λ1, multiplying the tree-level vertex structure, and the scalar, chiral symmetry breaking form factor λ3 are significantly enhanced in the infrared compared to the quenched (Nf=0) case. These enhancements are orders of magnitude larger than predicted by one-loop perturbation theory. We find only a weak dependence on the lattice spacing and quark mass.

    Item Type: Article
    Keywords: Quark-gluon; vertex; Nf = 2; lattice; QCD;
    Academic Unit: Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Faculty of Science and Engineering > Theoretical Physics
    Item ID: 15665
    Identification Number: https://doi.org/10.1103/PhysRevD.103.114515
    Depositing User: Dr. Jonivar Skullerud
    Date Deposited: 14 Mar 2022 12:55
    Journal or Publication Title: Physical Review D
    Publisher: American Physical Society
    Refereed: Yes
    URI:

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