Inverse meson mass ordering in the color-flavor-locking phase of high-density QCD - art. no. 074012

We derive the effective Lagrangian for the low-energy massive meson excitat ions of the color-flavor-locking (CFL) phase of QCD with three flavors of l ight quarks. We compute the decay constants, the maximum velocities, and th e masses of the mesons at large baryon chemical potential mu. The decay con stants are linear in mu. The meson maximum velocities are close to that of sound. The meson masses in the CFL phase are significantly smaller than in the normal QCD vacuum and depend only on bare quark masses. The order of th e meson masses is, to some extent, reversed compared to that in the QCD vac uum. In particular, the lightest particle is eta.