ar X iv : 0 71 0 . 08 69 v 1 [ he p - la t ] 3 O ct 2 00 7 Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes UKQCD and RBC Collaborations

نویسنده

  • C. T. Sachrajda
چکیده

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 ( fV and f T V respectively) in the MS scheme at 2 GeV are: f T ρ / fρ = 0.681(20); f T K∗/ fK∗ = 0.712(11) and f T φ / fφ = 0.751(9). For the first moment of the kaon’s distribution amplitude we find (in the same scheme and at the same scale) 〈ξ 〉K = 0.029(2) and for the second moment 〈ξ 2 〉π = 0.28(3) and 〈ξ 2 〉K = 0.27(2) .

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تاریخ انتشار 2007