Quantum Corrections to the Electroweak Sphaleron Transition

We have performed a new exact evaluation of the fluctuation determinant $κ$ of the electroweak sphaleron with $Θ_W =0$. The results differ significantly from a previous calculation of this quantity by Carson et. al. . We find that $κ$ is of order 1 in units $(gv)^6$ while the previous results indicated a strong suppression of the sphaleron transition by this factor.

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