Nucleon distribution amplitudes from lattice QCD

Göckeler, Meinulf; Horsley, Roger; Kaltenbrunner, Thomas; Nakamura, Yoshifumi; Pleiter, Dirk; Rakow, Paul E. L.; Schäfer, Andreas; Schierholz, Gerrit; Stüben, Hinnerk; Warkentin, Nikolaus; Zanotti, James M.

Nucleon distribution amplitudes from lattice QCD

Authors

Göckeler, Meinulf

Horsley, Roger

Kaltenbrunner, Thomas

Description

We calculate low moments of the leading-twist and next-to-leading twist nucleon distribution amplitudes on the lattice using two flavors of clover fermions. The results are presented in the MSbar scheme at a scale of 2 GeV and can be immediately applied in phenomenological studies. We find that the deviation of the leading-twist nucleon distribution amplitude from its asymptotic form is less pronounced than sometimes claimed in the literature.
5 pages, 3 figures, 2 tables. RevTeX style. Normalization for λ_i corrected. Discussion of the results extended. To be published in PRL