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We derive and analyze the Bethe-Salpeter equations for spin zero diquarks inthe color superconducting phase of cold dense QCD with two massless flavors.The spectrum of diquarks contains an infinite number of massive excitations andfive (nearly) massless pseudoscalars. The former are singlets while the latterinclude a doublet, an antidoublet and a singlet with respect to the unbroken$SU(2)_{c}$. Because of an approximate parity doubling at large chemicalpotential, all massive states come in pairs. The decay constants, as well asthe velocities of the (nearly) massless pseudoscalars are derived. Thedifferent role of the Meissner effect for tightly bound states andquasiclassical bound states is revealed.Comment: 31 pages, 4 figures, REVTeX. To appear in Phys. Rev.

Diquarks in cold dense QCD with two flavors