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

Manimala Chakraborti1,*, Dipankar Das2,†, Nivedita Ghosh3,‡, Samadrita Mukherjee4,§, and Ipsita Saha5,∥

  • 1School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
  • 2Department of Physics, Indian Institute of Technology (Indore), Khandwa Road, Simrol, 453 552 Indore, India
  • 3Centre for High Energy Physics, Indian Institute of Science, Bengaluru 560012, India
  • 4Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
  • 5Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

  • *mani.chakraborti@gmail.com
  • †d.das@iiti.ac.in
  • ‡niveditag@iisc.ac.in
  • §samadrita.mukherjee@tifr.res.in
  • ∥ipsita@iitm.ac.in
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Phys. Rev. D 109, 015016 – Published 16 January, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.015016

Abstract

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.

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Phys. Rev. D 109, 015016– Published 16 January, 2024
  • Received 16 August 2023
  • Accepted 15 December 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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