出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 2GeV are: f T
r = fr = 0:681(20); f T
K= fK = 0:712(11) and f T
f = ff = 0:751(9). For
the first moment of the kaon’s distribution amplitude we find (in the same scheme and at the same
scale) hx iK = 0:029(2) and for the second moment hx 2 ip = 0:28(3) and hx 2 iK = 0:27(2) .
