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Type: Journal article
Title: Combined collider constraints on neutralinos and charginos
Author: Athron, P.
Balázs, C.
Buckley, A.
Cornell, J.M.
Danninger, M.
Farmer, B.
Fowlie, A.
Gonzalo, T.E.
Harz, J.
Jackson, P.
Kudzman-Blais, R.
Kvellestad, A.
Martinez, G.D.
Petridis, A.
Raklev, A.
Rogan, C.
Scott, P.
Sharma, A.
White, M.
Zhang, Y.
Citation: European Physical Journal C: Particles and Fields, 2019; 79(5):395-1-395-52
Publisher: Springer
Issue Date: 2019
ISSN: 1434-6044
Statement of
Peter Athron, Csaba Balázs, Andy Buckley, Jonathan M. Cornell, Matthias Danninger ... Abhishek Sharma ... et al. (GAMBIT Collaboration)
Abstract: Searches for supersymmetric electroweakinos have entered a crucial phase, as the integrated luminosity of the Large Hadron Collider is now high enough to compensate for their weak production cross-sections. Working in a framework where the neutralinos and charginos are the only light sparticles in the Minimal Supersymmetric Standard Model, we use GAMBIT to perform a detailed likelihood analysis of the electroweakino sector. We focus on the impacts of recent ATLAS and CMS searches with Open image in new window of 13 TeV proton-proton collision data. We also include constraints from LEP and invisible decays of the Z and Higgs bosons. Under the background-only hypothesis, we show that current LHC searches do not robustly exclude any range of neutralino or chargino masses. However, a pattern of excesses in several LHC analyses points towards a possible signal, with neutralino masses of Open image in new window = (8–155, 103–260, 130–473, 219–502) GeV and chargino masses of Open image in new window = (104–259, 224–507) GeV at the 95% confidence level. The lightest neutralino is mostly bino, with a possible modest Higgsino or wino component. We find that this excess has a combined local significance of 3.3σ, subject to a number of cautions. If one includes LHC searches for charginos and neutralinos conducted with 8 TeV proton-proton collision data, the local significance is lowered to 2.9σ. We briefly consider the implications for dark matter, finding that the correct relic density can be obtained through the Higgs-funnel and Z-funnel mechanisms, even assuming that all other sparticles are decoupled. All samples, GAMBIT input files and best-fit models from this study are available on Zenodo.
Rights: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
DOI: 10.1140/epjc/s10052-019-6837-x
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