Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes

Abstract

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_ρ^T/f_ρ=0.681(20); f_{K^\ast}^T/f_{K^\ast}=0.712(11) and f_ϕ^T/f_ϕ=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>_π=0.28(3) and <xi^2>_K=0.27(2).

arXiv commentTalk presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany, 7 pages

References in corpus (7)

• Moments of pseudoscalar meson distribution amplitudes from the lattice
• Lattice Operators for Moments of the Structure Functions and their Transformation under the Hypercubic Group
• Coupling of the light vector meson to the vector and to the tensor current
• A lattice calculation of vector meson couplings to the vector and tensor currents using chirally improved fermions
• Model Independent Results for SU(3) Violation in Light-Cone Distribution Functions
• A Lattice Computation of the First Moment of the Kaon's Distribution Amplitude
• Meson decay constants from Nf=2 clover fermions

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• Effective-field theory analysis of the ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$ decays
• New vistas of the meson structure in QCD from low to high energies
• Kaon Electromagnetic Form Factor within the $k_T$ Factorization Formalism and It's Light-Cone Wave Function
• Chiral corrections to the f_V^T/f_V ratio for vector mesons
• Parton Distribution Amplitudes and Non-Perturbative Renormalisation
• 2+1 flavour Domain Wall Fermion simulations by the RBC and UKQCD collaborations
• Progress in hadron structure physics on the lattice
• Investigations of hadron structure on the lattice
• Light Meson Distribution Amplitudes
• Theory Summary of the Hadron Structure and QCD Workshop 2008