Effective chiral restoration in the ρ′ meson in lattice QCD

In simulations with dynamical quarks it has been established that the ground state rho in the infrared is a strong mixture of the two chiral representations (0, 1) + (1, 0) and (1/2, 1/2)(b). Its angular momentum content is approximately the S-3(1) partial wave. Effective chiral restoration in an excited rho-meson would require that in the infrared this meson couples predominantly to one of the two representations. The variational method allows one to study the mixing of interpolators with different chiral transformation properties in the nonperturbatively determined excited state at different resolution scales. We present results for the first excited state of the rho-meson using simulations with n(f) = 2 dynamical quarks. We point out, that in the infrared a leading contribution to rho' = rho(1450) comes from (1/2, 1/2)(b), in contrast to the rho. The rho' wave function contains a significant contribution of the D-3(1) wave which is not consistent with the quark model prediction.