Nucleon distribution amplitudes from lattice QCD
Meinulf G\"ockeler, Roger Horsley, Thomas Kaltenbrunner, Yoshifumi, Nakamura, Dirk Pleiter, Paul E. L. Rakow, Andreas Sch\"afer, Gerrit, Schierholz, Hinnerk St\"uben, Nikolaus Warkentin, James M. Zanotti
TL;DR
This paper computes low moments of nucleon distribution amplitudes using lattice QCD with two flavors of clover fermions, providing results in the MSbar scheme at 2 GeV for phenomenological applications.
Contribution
It presents the first lattice QCD calculation of low moments of nucleon distribution amplitudes with two flavors of clover fermions, clarifying their deviation from asymptotic forms.
Findings
Deviation from asymptotic form is less pronounced than previously claimed.
Results are provided in the MSbar scheme at 2 GeV.
Methodology enables direct application in phenomenology.
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.
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