Eur. Phys. J. C (2019) 79: 67
https://doi.org/10.1140/epjc/s10052-019-6590-1

Regular Article - Theoretical Physics

Extended gauge mediation in the NMSSM with displaced LHC signals

¹ Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warsaw, Poland
² LUPM, UMR 5299, CNRS, Université de Montpellier, 34095, Montpellier, France
³ Theoretical Physics Department, CERN, 1 Esplanade des Particules, 1211, Geneva 23, Switzerland

^* e-mail: robert.ziegler@cern.ch

Received: 24 October 2018
Accepted: 10 January 2019
Published online: 28 January 2019

Abstract

We analyze models of extended gauge Mediation in the context of the NMSSM, concentrating on supersymmetric spectra with light gluinos, low fine-tuning and decays of the lightest neutralino leading to displaced vertices. While the minimal scenario has rather heavy gluinos as a result of restrictions from the Higgs sector, we propose two new models in which the gluino can be as light as allowed by direct searches at the LHC, with a mass of about and , respectively. Both models have a tuning of a few permille, and lead to an interesting phenomenology due to a light singlet sector. A singlet state at around 98 GeV can account for the LEP excess, while the singlino has a mass of the order of 100 GeV and decays to b-jets and the gravitino, with decay lengths of a few cm.