Looking at the gluon moment of the nucleon with dynamical twisted mass fermions

Abstract

To understand the structure of hadrons it is important to know the PDF of their constituents, the quarks and gluons. In our work we aim to compute the first moment of the gluon PDF $⟨x{⟩}_g$ for the nucleon. We follow two possible approaches in order to extract the gluon moment: the Feynman-Hellmann theorem and a direct method with smearing of the gluon operator. We present preliminary results computed on $24^3\times 48$ lattices for the case where the Feynman-Hellman theorem is used and $32^3\times 64$ lattices for the direct method, employing $N_f=2+1+1$ maximally twisted mass fermions.

Comments: 7 pages, 3 figures, talk given at the 31st International Symposium on Lattice Field Theory (Lattice 2013), July 29-August 3 2013, Mainz, Germany