Updated bounds on the minimal left-right symmetric model from LHC dilepton resonance searches

Gabriela Lichtenstein; M. J. Neves; Farinaldo Queiroz; Ricardo C. Silva

doi:10.1140/epjc/s10052-026-15383-y

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2026) 86: 168
https://doi.org/10.1140/epjc/s10052-026-15383-y

Regular Article - Theoretical Physics

Updated bounds on the minimal left-right symmetric model from LHC dilepton resonance searches

Gabriela Lichtenstein¹^a, M. J. Neves², Farinaldo Queiroz¹^,3^,4^,5 and Ricardo C. Silva¹^,3^,6

¹ International Institute of Physics, Universidade Federal do Rio Grande do Norte, 59078-970, Natal, RN, Brazil
² Departamento de Física, Universidade Federal Rural do Rio de Janeiro, BR 465-07, 23890-971, Seropédica, RJ, Brazil
³ Departamento de Física, Universidade Federal do Rio Grande do Norte, 59078-970, Natal, RN, Brasil
⁴ Departamento de Física, Facultad de Ciencias, Universidad de La Serena, Avenida Cisternas 1200, La Serena, Chile
⁵ Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
⁶ Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Sorbonne Université, Paris, France

^a This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 30 September 2025
Accepted: 30 January 2026
Published online: 22 February 2026

Abstract

The Left-Right model is a popular extension of the Standard Model that features the new gauge bosons, $W_{R}^{\pm}$ $Mathematical equation: $$W^{\pm }_R$$$ and $Z_{R}$ Mathematical equation: $$Z_R$$ . Collider searches for a Left-Right symmetry are often concentrated on the charged right-handed current. However, in this work, we take advantage of the dilepton data at the LHC with center-of-mass energy of 13 TeV and 139 ${fb}^{- 1}$ $Mathematical equation: $$\hbox {fb}^{-1}$$$ of integrated luminosity to place lower mass bounds in the $Z_{R}$ Mathematical equation: $$Z_R$$ mass based on the $p p \to Z_{R} \to ℓ^{+} ℓ^{-} + X$ $Mathematical equation: $$p\,p \rightarrow Z_{R} \rightarrow \ell ^{+} \, \ell ^{-}+X$$$ process. We vary the $S U {(2)}_{R}$ Mathematical equation: $$SU(2)_R$$ gauge coupling from $g_{R} = 0.4$ $Mathematical equation: $$g_{R}=0.4$$$ to $g_{R} = 1.0$ $Mathematical equation: $$g_{R}=1.0$$$ , and find that the LHC data impose $M_{Z_{R}} > 5.4$ $Mathematical equation: $$M_{Z_R}>5.4$$$ TeV and $M_{Z_{R}} > 6.1$ $Mathematical equation: $$M_{Z_{R}}>6.1$$$ TeV, respectively. Lastly, we put our findings into perspective with $W_{R}$ Mathematical equation: $$W_R$$ searches at the LHC and show that our limits cover an unexplored region of parameter space, where the right-handed neutrino is heavier than the $W_{R}$ boson.

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Funded by SCOAP³.

Conference announcements

Heavy Quarks in the Quark-Gluon Plasma
18-20 May 2026
Bielefeld, Germany

International School of Cosmic Ray Astrophysics
24th Course: “Particles and the Cosmos”
29 July – 6 August 2026
Erice, Italy

EPJ

Updated bounds on the minimal left-right symmetric model from LHC dilepton resonance searches

Conference announcements