Diquarks in cold dense QCD with two flavors

Abstract

We derive and analyze the Bethe-Salpeter equations for spin zero diquarks in the color superconducting phase of cold dense QCD with two massless flavors. The spectrum of diquarks contains an infinite number of massive excitations and five (nearly) massless pseudoscalars. The former are singlets while the latter include a doublet, an antidoublet and a singlet with respect to the unbroken $SU(2{)}_c$. Because of an approximate parity doubling at large chemical potential, all massive states come in pairs. The decay constants, as well as the velocities of the (nearly) massless pseudoscalars are derived. The different role of the Meissner effect for tightly bound states and quasiclassical bound states is revealed.

31 pages, 4 figures, REVTeX. To appear in Phys. Rev. D

References in corpus (13)

• QCD-like Theories at Finite Baryon Density
• Inverse meson mass ordering in color-flavor-locking phase of high density QCD: erratum
• Meson Masses in High Density QCD
• Debye screening and Meissner effect in a two-flavor color superconductor
• The Transition Temperature to the Superconducting Phase of QCD at High Baryon Density
• Masses of the Goldstone modes in the CFL phase of QCD at finite density
• Debye screening and Meissner effect in a three-flavor color superconductor
• Non-Fermi Liquid Behaviour, the BRST Identity in the Dense Quark-Gluon Plasma and Color Superconductivity
• Dispersion Laws for Goldstone Bosons in a Color Superconductor
• Meson Mass at Large Baryon Chemical Potential in Dense QCD
• Generalized Mesons in Dense QCD
• A Note on Anomaly Matching for Finite Density QCD
• The Nonperturbative Color Meissner Effect in a Two-Flavor Color Superconductor

Cited by in corpus (15)

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• Two lectures on color superconductivity
• Domain walls of high-density QCD
• Abnormal number of Nambu-Goldstone bosons in the color-asymmetric 2SC phase of an NJL-type model
• Spin Polarization and Color Superconductivity in Quark Matter
• Pion, sigma-meson and diquarks in the 2SC phase of dense cold quark matter
• Mesons and diquarks in the color neutral 2SC phase of dense cold quark matter
• Bethe-Salpeter equation for diquarks in color-flavor locked phase of cold dense QCD
• Collective modes of color-flavor locked phase of dense QCD at finite temperature
• Color superconductivity and nondecoupling phenomena in 2+1 dimensional QCD
• Masses of the pseudo-Nambu-Goldstone bosons in two flavor color superconducting phase
• Generalized Ward identity and gauge invariance of the color-superconducting gap
• BCS vs Overhauser pairing in dense (2+1)d QCD
• Carlson-Goldman modes in the color superconducting phase of dense QCD
• The Spectrum of Diquark Composites in Cold Dense QCD