Distribution amplitudes and decay constants for (π,K,ρ,K*) mesons in the light-front quark model

We present a calculation of the quark distribution amplitudes (DAs), the Gegenbauer moments, and decay constants for π, ρ, K, and K* mesons using the light-front quark model. While the quark DA for π is somewhat broader than the asymptotic one, that for ρ meson is very close to the asymptotic one. The quark DAs for K and K* show asymmetric form due to the flavor SU(3)-symmetry breaking effect. The decay constants for the transversely polarized ρ and K* mesons (fρT and fK*T) as well as the longitudinally polarized ones (fρ and fK*) are also obtained. Our averaged values for fVT/fV, i.e. (fρT/fρ)av=0.78 and (fK*T/fK*)av=0.84, are found to be consistent with other model predictions. Especially, our results for the decay constants are in good agreement with the SU(6) symmetry relation, fρ(K*)T=(fπ(K) +fρ(K*))/2.