Please use this identifier to cite or link to this item:
https://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.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 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. |
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 |
Published version: | http://dx.doi.org/10.1140/epjc/s10052-019-6837-x |
Appears in Collections: | Aurora harvest 8 Physics publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_121004.pdf | Published Version | 7.13 MB | Adobe PDF | View/Open |
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