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Published February 1, 2015 | Published + Submitted
Journal Article Open

Singlet-catalyzed electroweak phase transitions and precision Higgs boson studies


We update the phenomenology of gauge-singlet extensions of the Standard Model scalar sector and their implications for the electroweak phase transition. Considering the introduction of one real scalar singlet to the scalar potential, we analyze present constraints on the potential parameters from Higgs coupling measurements at the Large Hadron Collider (LHC) and electroweak precision observables for the kinematic regime in which no new scalar decay modes arise. We then show how future precision measurements of Higgs boson signal strengths and the Higgs self-coupling could probe the scalar potential parameter space associated with a strong first-order electroweak phase transition. We illustrate using benchmark precision for several future collider options, including the high-luminosity LHC, the International Linear Collider, Triple-Large Electron-Positron collider, the China Electron-Positron Collider, and a 100 TeV proton-proton collider, such as the Very High Energy LHC or the Super Proton-Proton Collider. For the regions of parameter space leading to a strong first-order electroweak phase transition, we find that there exists considerable potential for observable deviations from purely Standard Model Higgs properties at these prospective future colliders.

Additional Information

© 2015 American Physical Society. Received 4 September 2014; published 17 February 2015. We thank H. Patel for collaboration during the early stages of this work and T. Liu, D. Stolarski, J. Shu for helpful discussions. S. P., M. J. R. M. and P.W. also thank the Kavli Institute for Theoretical Physics where a portion of this work was completed. This work was supported in part by U.S. Department of Energy Contracts No. DESC0011095 (M. J. R. M. and P.W.), DE-FG02-04ER41268 (S. P.), and by the National Science Foundation under Grant No. NSF PHY11-25915 (S. P., M. J. R.M., and P.W.).

Attached Files

Published - PhysRevD.91.035018.pdf

Submitted - 1407.5342v2.pdf


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