Searching for gluino LSP at the LHC

Paulina Knees; Essodjolo Kpatcha; Iñaki Lara; Daniel E. López-Fogliani; Carlos Muñoz; Natsumi Nagata; Hidetoshi Otono

doi:10.1140/epjc/s10052-025-14199-6

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2025) 85: 548
https://doi.org/10.1140/epjc/s10052-025-14199-6

Regular Article - Theoretical Physics

Searching for gluino LSP at the LHC

Paulina Knees¹, Essodjolo Kpatcha²^,3, Iñaki Lara⁴, Daniel E. López-Fogliani¹^,5^a, Carlos Muñoz²^,3, Natsumi Nagata⁶ and Hidetoshi Otono⁷

¹ Instituto de Física de Buenos Aires UBA & CONICET, Departamento de Física, Facultad de Ciencia Exactas y Naturales, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina
² Departamento de Física Teórica, Universidad Autónoma de Madrid (UAM), 28049, Madrid, Spain
³ Instituto de Física Teórica (IFT) UAM-CSIC, 28049, Madrid, Spain
⁴ Faculty of Physics, University of Warsaw, Pasteura 5, 02-093, Warsaw, Poland
⁵ Pontificia Universidad Católica Argentina, Av. Alicia Moreau de Justo 1500, 1107, Buenos Aires, Argentina
⁶ Department of Physics, University of Tokyo, 113-0033, Tokyo, Japan
⁷ Department of Physics, Kyushu University, 819-0395, Fukuoka, Japan

^a daniel.lopez@df.uba.ar

Received: 19 October 2024
Accepted: 21 April 2025
Published online: 17 May 2025

Abstract

We analyse relevant signals expected at the LHC, assuming that the gluino is the lightest supersymmetric particle (LSP) in the framework of the $μ ν$ $\mu \nu$ SSM. In this R-parity violating model, the presence of couplings involving right-handed neutrinos solves simultaneously the $μ$ $\mu$ problem and the accommodations of neutrino masses and mixing angles. We study gluino pair production in quark-antiquark and gluon-gluon collisions. The main decay channels for the gluino LSP are the three-body decays to two quarks and a lepton or a neutrino. In both cases, the leading channels occur for the third family of quarks. We compare the predictions of this scenario with LHC searches for prompt and long-lived particles. To analyse the parameter space we sample the $μ ν$ $\mu \nu$ SSM for a gluino LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Our results imply a lower limit on the mass of the gluino LSP of about 2600 GeV, and an upper limit for the decay length of about 6 cm.

© The Author(s) 2025

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