Extended Gauge Mediation in the NMSSM with Displaced LHC Signals

Marcin Badziak (1) , Nishita Desai (2) , Cyril Hugonie (2) , Robert Ziegler (3)

1 Institute of Theoretical Physics [Warsaw]
2 LUPM - Laboratoire Univers et Particules de Montpellier
3 CERN [Genève]

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 $1.7 \, \mathrm{TeV}$ and $2.0 \, \mathrm{TeV}$ , 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.

Mots clés: new physics; supersymmetry: symmetry breaking; mediation: gauge; minimal supersymmetric standard model; CERN LHC Coll; p p: scattering; sparticle: production; sparticle: signature; gluino: mass; gluino: heavy; jet: bottom; neutralino: mass; gravitino: mass; gravitino: decay; decay: length

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Marcin Badziak, Nishita Desai, Cyril Hugonie, Robert Ziegler. Extended Gauge Mediation in the NMSSM with Displaced LHC Signals. European Physical Journal C: Particles and Fields, 2019, 79 (1), pp.67. ⟨10.1140/epjc/s10052-019-6590-1⟩. ⟨hal-01909229⟩