Mesons and diquarks in the CFL phase of dense quark matter

TL;DR

This paper investigates the spectrum of mesons and diquarks in the CFL phase of dense quark matter using the NJL model, revealing stable mesons and diquark resonances with specific mass ranges.

Contribution

It provides a detailed analysis of meson and diquark excitations in the CFL phase, identifying Goldstone bosons as diquarks and characterizing their masses and stability.

Findings

All Nambu-Goldstone bosons are scalar and pseudoscalar diquarks.

Diquark resonances have masses around 230 MeV.

Mesons are stable with masses between 300 and 500 MeV.

Abstract

The spectrum of meson and diquark excitations of the color--flavor locked (CFL) phase of dense quark matter is considered in the framework of the Nambu -- Jona-Lasinio model. We have found that in this phase all Nambu--Goldstone bosons are realized as scalar and pseudoscalar diquarks. Other diquark excitations are resonances with mass value around 230 MeV. Mesons are stable particles in the CFL phase. Their masses vs chemical potential lie in the interval 300$\div$500 MeV.