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Scalar contributions to the S, T, U parameters in a 3-3-1 model

A. Doff1,* and C. A. de S. Pires2,†

  • *Contact author: agomes@utfpr.edu.br
  • †Contact author: cpires@fisica.ufpb.br
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Phys. Rev. D 113, 115039 – Published 15 June, 2026

DOI: https://doi.org/10.1103/42jl-gpsq

Abstract

Electroweak precision tests, expressed through the oblique parameters S, T, and U, impose stringent constraints on physics beyond the Standard Model. Gauge extensions of the Standard Model based on the SU(3)L×U(1)N symmetry predict a rich scalar and gauge spectrum that contribute to these parameters. Previous studies have shown that 3-3-1 gauge bosons give negligible contributions to the oblique parameters, while the contributions of the scalar sector to these parameters have received comparatively little attention. In particular, for the version of the SU(3)L×U(1)N model with right-handed neutrinos, the impact of the scalar sector on S, T, and U has not yet been addressed. In this work, we fill this gap and address systematically the scalar contributions to the S, T, and U within this version. As main result, we show that the parameter T puts stringent constraints on the masses and energy scales associated to the spectrum of scalars of the model.

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Phys. Rev. D 113, 115039– Published 15 June, 2026
  • Received 22 March 2026
  • Accepted 13 April 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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