We present results for the couplings of light vector mesons to vector and tensor currents and on the low moments of the light-cone distribution amplitudes of the pion and kaon. The calculations are performed on the RBC and UKQCD collaborations' ensembles generated with the Iwasaki gauge action and with 2+1 flavours of domain wall fermions. The (preliminary) results for the ratios of the couplings of the vector meson to the vector and tensor currents (f_V and f^T_V respectively) in the MSbar scheme at 2GeV are: f_\rho^T/f_\rho=0.681(20); f_{K^\ast}^T/f_{K^\ast}=0.712(11) and f_\phi^T/f_\phi=0.751(9). For the first moment of the kaon's distribution amplitude we find (in the same scheme and at the same scale) <xi>_K=0.029(2) and for the second moment <xi^2>_\pi=0.28(3) and <xi^2>_K=0.27(2).
@article{arxiv.0710.0869,
title = {Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes},
author = {D. Antonio and P. A. Boyle and M. A. Donnellan and J. Flynn and A. Juttner and C. Maynard and B. Pendleton and C. T. Sachrajda and R. Tweedie},
journal= {arXiv preprint arXiv:0710.0869},
year = {2009}
}
Comments
Talk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany, 7 pages