Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-11-09
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 8 figures, Presented at the XXVIII International Symposium on Lattice Field Theory, Lattice 2010, June 14-19, 2010 Vi
Scientific paper
The baryon number is violated in the Standard Model by non-perturbative sphaleron transitions. At temperatures above the electroweak scale, the rate of the sphaleron transitions is unsuppressed and has been accurately measured using effective theories on the lattice. At temperatures substantially below the electroweak scale, the Higgs field expectation value is large and the sphaleron rate is strongly suppressed. Here analytical estimates are sufficient. The sphaleron rate, however, has not been calculated in the intermediate temperature range with physical Standard Model parameters. In this work we use an effective electroweak theory on the lattice with multicanonical and real-time simulation methods to calculate the sphaleron rate through the electroweak crossover at Higgs masses of 115 GeV and 160 GeV. The results are significant e.g. for Leptogenesis scenarios.
D'Onofrio Michela
Rummukainen Kari
Tranberg Anders
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