On the Thermal Gauge Boson Masses of the Electroweak Theory in the Broken Phase

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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13 pages, Revtex; few typos corrected. Final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.58.016001

Thermal effects in the broken phase of the electroweak theory are studied in the strongly interacting Higgs boson limit. In that limit and at tree level the bosonic sector of the theory is a gauged non-linear sigma model. The associated one-loop thermal effective action for soft fields is then computed by using the background field method together with the Stueckelberg formalism. This effective action describes thermal corrections to the masses of the gauge bosons W, Z and the photon. It is the proper generalization of the hard thermal effective action of a Yang-Mills theory when there is a Higgs mechanism for a heavy Higgs particle.

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