Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1996-05-13
Nucl.Phys. B482 (1996) 265-285
Physics
High Energy Physics
High Energy Physics - Lattice
23 pages, 8 Postscript figures, uses epsf.sty
Scientific paper
The rate of $B$-violation in the standard model at finite temperature is closely related to the diffusion rate $\Gamma$ of Chern-Simons number. We compute this rate for $m_H \approx m_W$ in the classical approximation in an effective SU(2)-Higgs model, using Krasnitz's algorithm. The parameters in the effective hamiltonian are determined by comparison with dimensional reduction. In the high temperature phase we find $\Gamma/V (\alpha_W T)^4 \approx 1$, neglecting a finite renormalization. In the low temperature phase near the transition we find the rate to be much larger than might be expected from previous analytic calculations based on the sphaleron.
Smit Jan
Tang Wai Hung
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