Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-25
Phys.Rev. D72 (2005) 056007
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 4 figures; version accepted for the publication in PRD
Scientific paper
10.1103/PhysRevD.72.056007
The spectrum of meson and diquark excitations of dense color neutral cold quark matter is investigated in the framework of a 2-flavored Nambu--Jona-Lasinio type model, including a quark $\mu$- and color $\mu_8$ chemical potential. It was found out that in the color superconducting (2SC) phase, i.e. at $\mu>\mu_c=342$ MeV, $\mu_8$ aquires rather small values $\sim$ 10 MeV in order to ensure the color neutrality. In this phase the $\pi$- and $\sigma$ meson masses are evaluated around $\sim$ 330 MeV. The spectrum of scalar diquarks in the color neutral 2SC phase consists of a heavy ($\rm SU_c(2)$-singlet) resonance with mass $\sim$ 1100 MeV, four light diquarks with mass $3|\mu_8|$, and one Nambu --Goldstone boson which is in accordance with the Goldstone theorem. Moreover, in the 2SC phase there are five light stable particles as well as a heavy resonance in the spectrum of pseudo-scalar diquarks. In the color symmetric phase, i.e. for $\mu <\mu_c$, a mass splitting of scalar diquarks and antidiquarks is shown to arise if $\mu\ne 0$, contrary to the case of $\mu = 0$, where the masses of scalar antidiquarks and diquarks are degenerate at the value $\sim$~700 MeV. If the coupling strength in the pseudo-scalar diquark channel is the same as in the scalar diquark one (as for QCD-inspired NJL models), then in the color symmetric phase pseudo-scalar diquarks are not allowed to exist as stable particles.
Ebert Dietmar
Klimenko K. G.
Yudichev V. L.
No associations
LandOfFree
Mesons and diquarks in the color neutral 2SC phase of dense cold quark matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mesons and diquarks in the color neutral 2SC phase of dense cold quark matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mesons and diquarks in the color neutral 2SC phase of dense cold quark matter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-468361