Generalized Mesons in Dense QCD

Details Generalized Mesons in Dense QCD Generalized Mesons in Dense QCD

2000-01-12

arxiv.org/abs/hep-ph/0001104v2

Nucl.Phys.A676:273-310,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

43 pages, 4 figures, further discussions and references added

Scientific paper

10.1016/S0375-9474(00)00190-1

QCD superconductors in the color-flavor-locked (CFL) phase support excitations (generalized mesons) that can be described as pairs of particles or holes (rather than particle-hole) around a gapped Fermi surface. In weak coupling and to leading logarithm accuracy the scalar and pseudoscalar excitations are massless and the vector and axial-vector excitations are massive and degenerate. The massless scalar excitations are combined with the longitudinal gluons leading to the Meissner effect in the CFL phase. The mass of the composite vector excitations is close to twice the gap in weak coupling, but goes asymptotically to zero with increasing coupling thereby realizing Georgi's vector limit in cold and dense matter. We discuss the possible mixing of the composite scalar and vector excitations with the gluons, their possible coupling to the modified photons and their decay into light pseudoscalars in the CFL phase. The issue of hidden gauge-symmetry in the QCD superconductor is critically examined. The physical implications of our results on soft dilepton and neutrino emission in cold and dense matter are briefly discussed.

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