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New physics implications of vector boson fusion searches exemplified through the Georgi-Machacek model

Chakraborti, M and Das, D and Ghosh, N and Mukherjee, S and Saha, I (2024) New physics implications of vector boson fusion searches exemplified through the Georgi-Machacek model. In: Physical Review D, 109 (1).

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Official URL: https://doi.org/10.1103/PhysRevD.109.015016


LHC searches for nonstandard scalars in vector boson fusion (VBF) production processes can be particularly efficient in probing scalars belonging to triplet or higher multiplet representations of the Standard Model SU(2)L gauge group. They can be especially relevant for models where the additional scalars do not have any tree level couplings to the Standard Model fermions, rendering VBF as their primary production mode at the LHC. In this work we employ the latest LHC data from VBF resonance searches to constrain the properties of nonstandard scalars, taking the Georgi-Machacek model as a prototypical example. We take into account the theoretical constraints on the potential from unitarity and boundedness from below as well as indirect constraints coming from the signal strength measurements of the 125 GeV Higgs boson at the LHC. To facilitate the phenomenological analysis we advocate a convenient reparametrization of the trilinear couplings in the scalar potential. We derive simple correlations among the model parameters corresponding to the decoupling limit of the model. We explicitly demonstrate how a combination of theoretical and phenomenological constraints can push the Georgi-Machacek model towards the decoupling limit. Our analysis suggests that the VBF searches can provide key insights into the composition of the electroweak vacuum expectation value. © 2024 authors. Published by the American Physical Society.

Item Type: Journal Article
Publication: Physical Review D
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to Author.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 01 Mar 2024 09:03
Last Modified: 01 Mar 2024 09:03
URI: https://eprints.iisc.ac.in/id/eprint/83953

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