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Advances in High Energy Physics
Volume 2013 (2013), Article ID 672972, 28 pages
Review Article

Two Higgs Doublets, a 4th Generation and a 125 GeV Higgs: A Review

1Physics Department, Technion-Institute of Technology, 32000 Haifa, Israel
2Theoretische Elementarteilchenphysik, Naturwissenschaftlich Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
3Indian Institute of Technology, North Guwahati, Guwahati 781039, Assam, India
4Theory Group, Brookhaven National Laboratory, Upton, NY 11973, USA

Received 24 June 2012; Accepted 20 November 2012

Academic Editor: George Wei-Shu Hou

Copyright © 2013 Shaouly Bar-Shalom et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We review the possible role that multi-Higgs models may play in our understanding of the dynamics of a heavy 4th sequential generation of fermions. We describe the underlying ingredients of such models, focusing on two Higgs doublets, and discuss how they may effectively accommodate the low-energy phenomenology of such new heavy fermionic degrees of freedom. We also discuss the constraints on these models from precision electroweak data as well as from flavor physics and the implications for collider searches of the Higgs particles and of the 4th generation fermions, bearing in mind the recent observation of a light Higgs with a mass of ~125 GeV.