Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-11-30
Phys.Rev. D63 (2001) 114026
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 1 Figure, RevTex. More discussion and references added
Scientific paper
10.1103/PhysRevD.63.114026
We construct the effective theories describing the electroweak interactions for the low energy excitations associated with the color superconductive phases of QCD at high matter density. The main result, for the 3 flavor case, is that the quasiparticle Goldstone boson $\pi^0$ decay into two physical massless photons is identical to the zero density case once we use the new Goldstone decay constant and the modified electric charge $\widetilde{e}=e \cos\theta$, with $\tan\theta =2e/\sqrt{3}g_s$ and $g_s$ the strong coupling constant. For 2 flavors we find that the coupling of the quarks to the neutral vector boson $Z^0$ is modified with respect to the zero density case. We finally point out possible applications of our result to the physics of compact objects.
Casalbuoni Roberto
Duan Zhisheng
Sannino Francesco
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