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We study the first-order finite-temperature electroweak phase transition ofthe SU(2) gauge-Higgs model defined on a 4-dimensional isotropic lattice withtemporal extension N_t=2. Finite-size scaling study of Lee-Yang zeros yieldsthe value of the Higgs self coupling of the endpoint at lambda_c=0.00116(16).An independent analysis of Binder cumulant gives a consistent value for theendpoint. Combined with our zero-temperature measurement of Higgs and W bosonmasses, this leads to M_{H,c}=73.3 +- 6.4 GeV for the critical Higgs boson massbeyond which the electroweak transition turns into a crossover.Comment: 17 pages, 9 EPS figures, revtex and eps

The end point of the first-order phase transition of the SU(2) gauge-Higgs model on a 4-dimensional isotropic lattice