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Triplet Higgs boson collider phenomenology after the LHC

Englert, Christoph; Re, Emanuele; Spannowsky, Michael

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Christoph Englert

Emanuele Re


ATLAS and CMS have discovered a standard model (SM) Higgs-like particle. One of the main discovery channels is the Higgs decay to two photons, which, at the moment, seems to be considerably enhanced over the standard model expectation. Models with additional charged matter coupling to the Higgs sector can enhance or decrease the h→γγ branching ratio. We take this as motivation to confront the so-called Georgi-Machacek model of Higgs triplets with the results of recent searches for a SM Higgs boson performed at the LHC. We also investigate the model in regions of the allowed parameter space relevant for a SM-like phenomenology. The Georgi-Machacek model avoids tree-level issues of the T parameter, while offering a vastly modified Higgs phenomenology compared to the standard model. This comes at the price of introducing another fine-tuning problem related to electroweak precision measurements. We investigate the collider phenomenology of the Georgi-Machacek model in the light of existing collider constraints beyond any effective field theory approximation and contextualize our findings with electroweak precision constraints.


Englert, C., Re, E., & Spannowsky, M. (2013). Triplet Higgs boson collider phenomenology after the LHC. Physical Review D, 87(9), Article 095014.

Journal Article Type Article
Publication Date May 23, 2013
Deposit Date Dec 12, 2014
Publicly Available Date May 21, 2015
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 87
Issue 9
Article Number 095014


Published Journal Article (3.3 Mb)

Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review D 87, 095014 © 2013 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.

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