Diquarks in the color--flavor locked phase of dense quark matter

Details Diquarks in the color--flavor locked phase of dense quark matter Diquarks in the color--flavor locked phase of dense quark matter

2006-11-30

arxiv.org/abs/hep-ph/0611385v2

Phys.Rev.D75:045005,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures; version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.75.045005

Diquark excitations of dense quark matter are considered in the framework of the Nambu -- Jona-Lasinio model with three types of massless quarks in the presense of a quark number chemical potential $\mu$. We investigate the effective action of meson- and diquark fields at sufficiently high values of $\mu$, where the color--flavor locked (CFL) phase is realized, and prove the existence of NG-bosons in the sector of pseudoscalar diquarks. In the sector of scalar diquarks an additional NG-boson is found, corresponding to the spontaneous breaking of the U(1)$_B$ baryon symmetry in the CFL phase. Finally, the existence of massive scalar and pseudoscalar diquark excitations is demonstrated.

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