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We investigated numerically properties of Nambu monopoles in latticeElectroweak theory at realistic values of $\alpha$ and $\theta_W$. Our choiceof parameters of lattice Lagrangian corresponds to large values of the Higgsboson mass $M_H > 2 M_W$.  We find that the density of Nambu monopoles cannot be predicted by the choiceof the initial parameters of Electroweak theory and should be considered as thenew external parameter of the theory. We also investigate the differencebetween the versions of Electroweak theory with the gauge groups $SU(2)\otimesU(1)$ and $SU(2)\otimes U(1)/Z_2$. We do not detect any difference at $\alpha\sim {1/128}$. However, such a difference appears in the strong coupling regionand is related to the properties of monopoles constructed of the hyperchargefield.

Lattice study of monopoles in the Electroweak theory