Nucleon distribution amplitudes from lattice QCD

Abstract

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

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