Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/121004
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Type: Journal article
Title: Combined collider constraints on neutralinos and charginos
Author: Athron, P.
Balázs, C.
Buckley, A.
Cornell, J.
Danninger, M.
Farmer, B.
Fowlie, A.
Gonzalo, T.
Harz, J.
Jackson, P.
Kudzman-Blais, R.
Kvellestad, A.
Martinez, G.
Petridis, A.
Raklev, A.
Rogan, C.
Scott, P.
Sharma, A.
White, M.
Zhang, Y.
Citation: European Physical Journal C, 2019; 79(5):395-1-395-52
Publisher: Springer
Issue Date: 2019
ISSN: 1434-6044
1434-6052
Statement of
Responsibility: 
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 (http://creativecommons.org/licenses/by/4.0/), 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.
RMID: 0030132797
DOI: 10.1140/epjc/s10052-019-6837-x
Grant ID: http://purl.org/au-research/grants/arc/CE110001004
http://purl.org/au-research/grants/arc/DP180100031
http://purl.org/au-research/grants/arc/FT130100018
http://purl.org/au-research/grants/arc/FT140100244
http://purl.org/au-research/grants/arc/FT160100274
Appears in Collections:Physics publications

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