Singlet Higgs phenomenology and the electroweak phase transition

Creators: Profumo, Stefano; Ramsey-Musolf, Michael J.; Shaughnessy, Gabe

Abstract

We study the phenomenology of gauge singlet extensions of the Standard Model scalar sector and their implications for the electroweak phase transition. We determine the conditions on the scalar potential parameters that lead to a strong first order phase transition as needed to produce the observed baryon asymmetry of the universe. We analyze the constraints on the potential parameters derived from Higgs boson searches at LEP and electroweak precision observables. For models that satisfy these constraints and that produce a strong first order phase transition, we discuss the prospective signatures in future Higgs studies at the Large Hadron Collider and a Linear Collider. We argue that such studies will provide powerful probes of phase transition dynamics in models with an extended scalar sector.

Additional Information

© 2007 SISSA. Received 25 May 2007, accepted for publication 29 July 2007, Published 3 August 2007 We thank M. Wise, P. Langacker, D. Chung, V. Barger and A. Kusenko for several helpful discussions, and D. O'Connell for useful conversations and a critical reading of the manuscript. We thank J. Kile and J. Erler for assistance with the GAPP routine. This work was supported by the U.S. Department of Energy contracts DE-FG02-05ER41361 (M.R.M. and S.P), DE-FG03-92-ER40701 (S.P.) and DE-FG02-95ER40896 (G.S.); by the National Science Foundation grant PHY-0555674 (M.R.-M.) and by NASA grant number NNG05GF69G (S.P.). E-print number: 0705.2425

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