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Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes

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Original languageEnglish
Article number369
JournalProceedings of Science
Issue numberLATTICE 200
Publication statusPublished - 3 Oct 2007


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) _K=0.029(2) and for the second moment _\pi=0.28(3) and _K=0.27(2).

    Research areas

  • hep-lat

ID: 11137788