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Fermionic Dispersion Relations in the Standard Model at Finite Temperature

C. Quimbay·S. Vargas-Castrillon
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Abstract

We compute the one-loop dispersion relations at finite temperature for quarks, charged leptons and neutrinos in the Minimal Standard Model. The dispersion relations are calculated in two different plasma situations: for a vacuum expectation value $\upsilon$ of the Higgs field $\upsilon \neq 0$ (broken electroweak symmetry) and for $\upsilon=0$ (unbroken electroweak symmetry). The flavour and chiral non-degeneracy of the quasi-particle spectrum is studied. Numerical results show that the thermal effective masses for fermions in the broken phase have a smaller value than those in the unbroken phase. The temperature dependence of the top quark and electron neutrino thermal effective masses is also presented. Gauge invariance of one-loop dispersion relations is studied.

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C. Quimbay, S. Vargas-Castrillon. 1995-04-27. Fermionic Dispersion Relations in the Standard Model at Finite Temperature. https://doi.org/10.1016/0550-3213(95)00298-7

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