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

作者：Choi Ho Meoyng^*; Ji Chueng Ryong

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, 75(3): 034019.

DOI：10.1103/PhysRevD.75.034019

We present a calculation of the quark distribution amplitudes (DAs), the Gegenbauer moments, and decay constants for pi, rho, K, and K-* mesons using the light-front quark model. While the quark DA for pi is somewhat broader than the asymptotic one, that for rho 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 rho and K-* mesons (f(rho)(T) and f(K)(*T)) as well as the longitudinally polarized ones (f(rho) and f(K)(*)) are also obtained. Our averaged values for f(V)(T)/f(V), i.e. (f(rho)(T)/f(rho))(av)=0.78 and (f(K)(*T)/f(K)(*))(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, f(rho(K)(*))(T)=(f(pi(K))+f(rho(K)(*)))/2.

• 出版日期2007-2
• 单位南宁师范大学