Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-11
Phys.Rev. D62 (2000) 114008
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 2 figures; explanations on the role of the Meissner effect added; 2 references added; accepted for publication in PR
Scientific paper
10.1103/PhysRevD.62.114008
Present computations of the gap of color superconductivity in weak coupling assume that the quarks which participate in the condensation process are infinitely long-lived. However, the quasiparticles in a plasma are characterized by having a finite lifetime. In this article we take into account this fact to evaluate its effect in the computation of the color gap. By first considering the Schwinger-Dyson equations in weak coupling, when one-loop self-energy corrections are included, a general gap equation is written in terms of the spectral densities of the quasiparticles. To evaluate lifetime effects, we then model the spectral density by a Lorentzian function. We argue that the decay of the quasiparticles limits their efficiency to condense. The value of the gap at the Fermi surface is then reduced. To leading order, these lifetime effects can be taken into account by replacing the coupling constant of the gap equation by a reduced effective one.
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