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dc.contributor.authorAthron, Peter
dc.contributor.authorBalázs, Csaba
dc.contributor.authorBuckley, Andy
dc.contributor.authorCornell, Jonathan M.
dc.contributor.authorDanninger, Matthias
dc.contributor.authorFarmer, Ben
dc.contributor.authorFowlie, Andrew
dc.contributor.authorGonzalo, Tomás E.
dc.contributor.authorHarz, Julia
dc.contributor.authorJackson, Paul
dc.contributor.authorKudzman-Blais, Rose
dc.contributor.authorKvellestad, Anders
dc.contributor.authorMartinez, Gregory D.
dc.contributor.authorPetridis, Andreas
dc.contributor.authorRaklev, Are
dc.contributor.authorRogan, Christopher
dc.contributor.authorScott, Pat
dc.contributor.authorSharma, Abhishek
dc.contributor.authorWhite, Martin
dc.contributor.authorZhang, Yang
dc.identifier.citationGAMBIT Collaboration:., Athron, P., Balázs, C. et al. Combined collider constraints on neutralinos and charginos. Eur. Phys. J. C 79, 395 (2019).
dc.descriptionThis work is licensed under a Creative Commons Attribution 4.0 International License.en_US
dc.description.abstractSearches 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 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 = (8–155, 103–260, 130–473, 219–502) GeV and chargino masses of = (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.en_US
dc.rights© The Author(s) 2019.en_US
dc.titleCombined collider constraints on neutralinos and charginosen_US
kusw.kuauthorRogan, Christopher
kusw.kudepartmentPhysics and Astronomyen_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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Except where otherwise noted, this item's license is described as: © The Author(s) 2019.