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This article is cited in 15 scientific papers (total in 15 papers)
Mesons and diquarks in a dense quark medium with color superconductivity
K. G. Klimenkoa, D. Ebertb a Institute for High Energy Physics
b Humboldt University
Abstract:
In the framework of the Nambu–Jona-Lasinio model with two quark flavors, we
investigate the spectrum of meson and diquark excitations of dense quark
matter in the phase with color superconductivity. The color $SU_{\mathrm{c}}(3)$
symmetry is spontaneously broken to $SU_{\mathrm{c}}(2)$ in this phase. But instead
of the expected five Goldstone bosons in the mass spectrum, we observe only
three, among which two bosons obey the quadratic dispersion law. We find
the doublet of light diquark states with the mass $\sim15$ MeV and also
the heavy diquark resonance $(SU_{\mathrm{c}}(2)$ singlet$)$ with the mass
$\sim1100$ MeV. The $\pi$- and $\sigma$-mesons have the mass $\sim330$ Mev
in the phase with color superconductivity. The $\pi$-mesons are then stable
particles, while the $\sigma$-meson is stable only in the chiral limit in
which the current quark mass $m_0$ becomes zero. If $m_0\ne0$, then
the $\sigma$-meson mixes with diquarks in the phase with color superconductivity
and becomes a resonance with the width $\sim30$ MeV.
Keywords:
Nambu–Jona-Lasinio model, color superconductivity, mesons, diquarks, Goldstone bosons.
Received: 11.05.2006
Citation:
K. G. Klimenko, D. Ebert, “Mesons and diquarks in a dense quark medium with color superconductivity”, TMF, 150:1 (2007), 95–111; Theoret. and Math. Phys., 150:1 (2007), 82–96
Linking options:
https://www.mathnet.ru/eng/tmf5967https://doi.org/10.4213/tmf5967 https://www.mathnet.ru/eng/tmf/v150/i1/p95
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Abstract page: | 558 | Full-text PDF : | 253 | References: | 77 | First page: | 4 |
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