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Sensitivity of Higgs factories to composite Higgs models via precision measurements

Kamal Maayergi and Devin G. E. Walker

Ora Cullen

Michael E. Peskin

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Phys. Rev. D 113, 095018 – Published 12 May, 2026

DOI: https://doi.org/10.1103/jgsv-fdyk

Abstract

We investigate the potential of precision Higgs factory measurements to discover signatures of a representative model of electroweak symmetry breaking in which the Higgs boson arises as a composite Nambu-Goldstone boson. In this model, as in other models of the “Little Higgs” or Natural Composite Higgs type, the primary perturbations of the Standard Model come from effects of vectorlike top quark partners. We carry out an explicit calculation of the Higgs potential in this model. Applying phenomenological constraints, we are left with a three-dimensional parameter space. We then present results from a complete scan of this parameter space. The region in which there are significant departures from the Standard Model predictions extends to models in which the lightest top quark partner has a mass above 3 TeV. Little Higgs models with such heavy top partners also predict significant deviations from the Standard Model in the top quark electroweak couplings, in particular, in the model studied here, in the tL coupling to the Z boson.

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Phys. Rev. D 113, 095018– Published 12 May, 2026
  • Received 20 January 2026
  • Accepted 23 March 2026
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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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