A nonperturbative analysis of the finite T phase transition in SU (2) × U (1) electroweak theory
Abstract
The continuum 3D SU(2) × U(1)+Higgs theory is an effective theory for a large class of 4D hightemperature gauge theories, including the minimal standard model and some of its supersymmetric extensions. We study the effects of the U(1) subgroup using lattice Monte Carlo techniques. When g' ^{2}/ g^{2} is increased from the zero corresponding to pure SU(2)+Higgs theory, the phase transition gets stronger. However, the increase in the strength is close to what is expected perturbatively, and the qualitative features of the phase diagram remain the same as for g' ^{2} = 0. In particular, the firstorder transition still disappears for m_{H} > m_{H, c}. We measure the photon mass and mixing angle, and find that the mass vanishes in both phases within the statistical errors.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1997
 DOI:
 10.1016/S05503213(97)001648
 arXiv:
 arXiv:heplat/9612006
 Bibcode:
 1997NuPhB.493..413K
 Keywords:

 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 Latex, 30 pages, 15 eps figures