Nucleon distribution amplitudes from lattice QCD.
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 MS[over ] 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.
Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany.
Meinulf
M
Göckeler
Roger
R
Horsley
Thomas
T
Kaltenbrunner
Yoshifumi
Y
Nakamura
Dirk
D
Pleiter
Paul E L
PE
Rakow
Andreas
A
Schäfer
Gerrit
G
Schierholz
Hinnerk
H
Stüben
Nikolaus
N
Warkentin
James M
JM
Zanotti