The strength of the electroweak phase transition at m(H)approximate to 80 GeV

In this letter we present the results of our numerical simulations for the finite temperature electroweak phase transition using the SU(2)-Higgs model on four-dimensional lattices at m(H) approximate to 80 GeV. The temporal e xtension L-t = 2 is used for asymmetric lattice spacings with an asymmetry parameter a(s)/a(t) approximate to 4. The measured thermodynamical quantiti es (interface tension, jump of the order parameter and latent heat) suggest that the phase transition is of Very weakly first order. (C) 1998 Elsevier Science B.V. All rights reserved.