February 29, 14:15 in A315   

Michela D'Onofrio (Helsinki U.)


The sphaleron rate through the electroweak crossover

Abstract: The baryon number in the Standard Model is violated by non-perturbative sphaleron transitions. Using lattice simulations, we calculate the sphaleron rate in the Standard Model at experimentally allowed values for the Higgs mass. In particular, this quantity enters computations of Baryogenesis via Leptogenesis, which is mediated by equilibrium sphaleron transitions that convert non-zero lepton number into non-zero baryon number. Combining existing numerical methods applicable in the symmetric and broken electroweak phases, we find the temperature dependence of the sphaleron rate at very high temperatures, through the electroweak crossover transition, and deep into the broken phase.