Speaker
Dr
Ayse Kizilersu
(University of Adelaide)
Description
We study the quark-gluon vertex in the limit of vanishing gluon momentum using lattice QCD with 2 flavors of O(a) improved Wilson fermions, for several lattice spacings and quark masses. We fi?nd that all three form factors in this kinematics have a signi?cant infrared strength, and
that both the leading form factor ?1, multiplying the tree-level vertex structure, and the scalar,
chiral symmetry breaking form factor ?3 are signi?cantly 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 ?nd only a weak dependence on the lattice spacing and quark
mass.
Primary author
Dr
Ayse Kizilersu
(University of Adelaide)
Co-authors
Dr
Jonivar Skullerud
(University of Ireland Maynooth)
Dr
Orlando Oliveira
(University of Coimbra)
Dr
Andre Sternbeck
(Friedrich-Schiller-Universitat Jena)
Dr
Paulo Silva
(University of Coimbra)
