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Prompt signals and displaced vertices in sparticle searches for next-to-minimal gauge-mediated supersymmetric models

Published version
Peer-reviewed

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Authors

Allanach, BC 
Badziak, M 
Cottin, G 
Desai, N 
Hugonie, C 

Abstract

We study the LHC phenomenology of the next-to-minimal model of gauge-mediated supersymmetry breaking, both for Run I and Run II. The Higgs phenomenology of the model is consistent with observations: a 125 GeV standard model-like Higgs which mixes with singlet-like state of mass around 90 GeV that provides a 2σ excess at LEP II. The model possesses regions of parameter space where a longer-lived lightest neutralino decays in the detector into a gravitino and a b-jet pair or a tau pair resulting in potential displaced vertex signatures. We investigate current bounds on sparticle masses and the discovery potential of the model, both via conventional searches and via searches for displaced vertices. The searches based on promptly decaying sparticles currently give a lower limit on the gluino mass 1080 GeV and could be sensitive up to 1900 GeV with 100 fb−1, whereas the current displaced vertex searches cannot probe this model due to b-quarks in the final state. We show how the displaced vertex cuts might be relaxed in order to improve signal efficiency, while simultaneously applied prompt cuts reduce background, resulting in a much better sensitivity than either strategy alone and motivating a fully fledged experimental study.

Description

Keywords

hep-ph, hep-ph, hep-ex

Journal Title

The European Physical Journal C

Conference Name

Journal ISSN

1434-6044
1434-6052

Volume Title

76

Publisher

Springer
Sponsorship
Science and Technology Facilities Council (ST/L000385/1)
The authors acknowledge the support of France Grilles for providing cloud computing resources on the French National Grid Infrastructure. This work has been partially supported by STFC Grant ST/L000385/1, by the Office of High Energy Physics of the U.S. Department of Energy under Contract DE-AC02-05CH11231, by the National Science Foundation under Grant PHY-1316783, by the Foundation for Polish Science through its programme HOMING PLUS, by National Science Centre under research Grant DEC- 2014/15/B/ST2/02157, by the ILP LABEX under reference ANR-10- LABX-63, and by French state funds managed by the ANR within the Investissements d’Avenir programme under reference ANR-11- IDEX-0004-02. GC was funded by the postgraduate Conicyt-Chile Cambridge Scholarship 84130011. ND was partially supported by the Alexander von Humboldt Foundation. MB acknowledges support from the Polish Ministry of Science and Higher Education (Decision No. 1266/MOB/IV/2015/0). BCA, MB and GC would like to thank other members of the Cambridge SUSY Working group for discussions. RZ thanks B. Fuks, A. Mariotti, D. Redigolo and O. Slone for useful discussions. We thank the authors of Delphes3 for discussions about the program related to this work. ND and MB would like to thank the Cavendish Laboratory for hospitality offered while working on this project. MB and RZ thanks the Galileo Galilei Institute for Theoretical Physics and INFN for hospitality and partial support during the completion of this work.