Abstract
We study the spectrum of scalar-isoscalar excitations in the color-flavor locked phase of dense quark matter. The sigma meson in this phase appears as a four-quark state (of diquark and antidiquark) with a well-defined mass and extremely small width, as a consequence of its small coupling to two pions. The quark particle/hole degrees of freedom also contribute significantly to the correlator just above the threshold where is the superconducting gap.
- Received 4 November 2002
DOI:https://doi.org/10.1103/PhysRevC.67.045202
©2003 American Physical Society