Friday, November 16, 2012

1211.3449 (Hooman Davoudiasl et al.)

Electroweak Phase Transition, Higgs Diphoton Rate, and New Heavy
Fermions
   [PDF]

Hooman Davoudiasl, Ian Lewis, Eduardo Ponton
We show that weak scale vector-like fermions with order one couplings to the Higgs can lead to a novel mechanism for a strongly first-order electroweak phase transition (EWPhT). These same fermions could also enhance the loop-induced branching fraction of the Higgs into two photons, as suggested by the recent discovery of a ~ 125 GeV Higgs-like state at the CERN Large Hadron Collider (LHC). Our results suggest that a precise measurement of the Higgs diphoton decay rate, at the LHC or perhaps at a future lepton collider, could provide a probe of the EWPhT in the early Universe, with significant implications for the viability of electroweak baryogenesis scenarios.
View original: http://arxiv.org/abs/1211.3449

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