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• W2000499475 abstract "The spectrum of meson and diquark excitations of dense cold quark matter is investigated within the framework of a Nambu--Jona-Lasinio-type model for light quarks of two flavors. It was found that a first-order phase transition occurs when the chemical potential ensuremath{mu} exceeds the critical value ${ensuremath{mu}}_{c}=350phantom{rule{0.3em}{0ex}}text{MeV}$. Above ${ensuremath{mu}}_{c}$, the diquark condensate $ensuremath{langle}mathit{qq}ensuremath{rangle}$ forms, breaking the color symmetry of strong interaction. The masses of ensuremath{pi} and ensuremath{sigma} mesons are shown to grow with the chemical potential ensuremath{mu} in the color-superconducting phase, but the mesons themselves become almost stable particles. Moreover, we have found in this phase an abnormal number of three, instead of five, Nambu-Goldstone bosons, together with a color doublet of light stable diquark modes and a color-singlet heavy diquark resonance with mass $~$1100 MeV. In the color-symmetric phase, i.e., for $ensuremath{mu}<{ensuremath{mu}}_{c}$, a mass splitting of diquarks and antidiquarks is shown to arise if $ensuremath{mu}ensuremath{ne}0$, contrary to the case of a vanishing chemical potential, in which the masses of antidiquarks and diquarks are degenerate at the value $~$700 MeV." @default.
• W2000499475 created "2016-06-24" @default.
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• W2000499475 date "2005-07-07" @default.
• W2000499475 modified "2023-09-25" @default.
• W2000499475 title "Pion, σ meson, and diquarks in the two-flavor color-superconducting phase of dense cold quark matter" @default.
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• W2000499475 doi "https://doi.org/10.1103/physrevc.72.015201" @default.
• W2000499475 hasPublicationYear "2005" @default.
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