Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-05-21
JHEP 0707:031,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures, RevTeX4 style. Version accepted for publication on JHEP. Some minor change in the text
Scientific paper
10.1088/1126-6708/2007/07/031
We offer a diagrammatic derivation of the effective masses of the axial flavor excitations in the electrical and color neutral CFL phase of QCD. In particular we concentrate on the excitations with the quantum numbers of the kaons: we show how their effective chemical potentials, responsible of their Bose-Einstein condensation and found previously on the basis of pure symmetry arguments, arise at the microscopic level by loop effects. We perform also the numerical evaluation of the relevant loops in the whole CFL regime $M_s^2/2\mu\Delta\leqslant 1$, showing the existence of the enhancement of the kaon condensation with respect to the lowest order result. Finally we discuss the role of electrical and color neutrality in the microscopic calculation.
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