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The spectrum of meson and diquark excitations of dense quark matter isconsidered in the framework of the Nambu -- Jona-Lasinio model with three typesof massless quarks in the presense of a quark number chemical potential $\mu$.We investigate the effective action of meson- and diquark fields both atsufficiently large values of $\mu>\mu_c\approx 330$ MeV, where thecolor--flavor locked (CFL) phase is realized, and in the chirally broken phaseof quark matter ($\mu<\mu_c$). In the last case all nine pseudoscalar mesonsare Nambu -- Goldstone (NG) bosons, whereas the mass of the scalar meson nonetis twice the dynamical quark mass. In the chirally broken phase thepseudoscalar diquarks are not allowed to exist as stable particles, but thescalar diquarks might be stable only at a rather strong interaction in thediquark channel. In the case of the CFL phase, all NG bosons of the model arerealized as scalar and pseudoscalar diquarks. Moreover, it turns out thatmassive diquark excitations are unstable for this phase. In particular, for thescalar and pseudoscalar octets of diquark resonances a mass value around 230MeV was found numerically. In contrast, mesons are stable particles in the CFLphase. Their masses lie in the interval 400$\div$500 MeV for not too largevalues of $\mu>\mu_c$.

Mass spectrum of diquarks and mesons in the color--flavor locked phase of dense quark matter