Mesons and diquarks in neutral color superconducting quark matter with $β$-equilibrium
| dc.creator | Ebert, D. | |
| dc.creator | Klimenko, K. G. | |
| dc.creator | Yudichev, V. L. | |
| dc.date | 2006-08-29 | |
| dc.date | 2006-11-17 | |
| dc.date.accessioned | 2026-07-07T10:41:58Z | |
| dc.date.available | 2026-07-07T10:41:58Z | |
| dc.description | The spectrum of meson and diquark excitations in cold color-superconducting (2SC) quark matter is investigated under local color and electric neutrality constraints with $β$-equilibrium. A 2-flavored Nambu--Jona-Lasinio type model including a baryon $μ_B$, color $μ_8$, and electric $μ_Q$ chemical potentials is used. Two relations between coupling constants $H$ and $G$ in the diquark- and quark-antiquark channels, correspondingly, are treated, $H=3G/4$ and $H=G$. At $H=3G/4$ the gapless- and at $H=G$ the gapped neutral color superconductivity is realized. It is shown that color and electrical neutrality together with $β$-equilibrium lead to a strong mass splitting within the pion isotriplet in the 2SC phase (both gapped and gapless), in contrast with non--neutral matter. It is also shown that the properties of the physical $SU(2)_c$-singlet diquark excitation in the 2SC ground state varies for different parameterization schemes. Thus, for $H=3G/4$ one finds a heavy resonance with mass $\sim$ 1100 MeV in the non--neutral (gapped) case, whereas, if neutrality is imposed, a stable diquark with mass $\simμ_Q\sim$ 200 MeV appears in the gapless 2SC phase. For $H=G$, there is again a resonance (with the mass $\sim$ 300 MeV) in the neutral gapped 2SC phase. Hence, the existence of the stable massive SU(2)$_c$-singlet diquark excitation is a new peculiarity of the gapless 2SC. | |
| dc.description | 18 pages, 9 figures; version accepted for publication in PRD | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0608304 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0608304 | |
| dc.identifier | Phys.Rev.D75:025024,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.75.025024 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/181795 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Mesons and diquarks in neutral color superconducting quark matter with $β$-equilibrium | |
| dc.type | text |