Combined collider constraints on neutralinos and charginos

Autor: The GAMBIT Collaboration, Athron, Peter, Balázs, Csaba, Buckley, Andy, Cornell, Jonathan M., Danninger, Matthias, Farmer, Ben, Fowlie, Andrew, Gonzalo, Tomás E., Harz, Julia, Jackson, Paul, Kudzman-Blais, Rose, Kvellestad, Anders, Martinez, Gregory D., Petridis, Andreas, Raklev, Are, Rogan, Christopher, Scott, Pat, Sharma, Abhishek, White, Martin, Zhang, Yang
Přispěvatelé: Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), GAMBIT
Rok vydání: 2019
Předmět:
Particle physics
p p: scattering
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Physics and Astronomy (miscellaneous)
neutralino: mass
chargino: mass
FOS: Physical sciences
Higgs particle: invisible decay
lcsh:Astrophysics
01 natural sciences
High Energy Physics - Phenomenology (hep-ph)
Chargino
chargino: production
lcsh:QB460-466
0103 physical sciences
lcsh:Nuclear and particle physics. Atomic energy. Radioactivity
Higgsino
010306 general physics
Engineering (miscellaneous)
Boson
Physics
Large Hadron Collider
010308 nuclear & particles physics
dark matter: relic density
new physics: search for
High Energy Physics::Phenomenology
Superpartner
minimal supersymmetric standard model
neutralino: production
High Energy Physics - Phenomenology
Z0: invisible decay
CERN LHC Coll
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Neutralino
Higgs boson
lcsh:QC770-798
High Energy Physics::Experiment
supersymmetry
neutralino: dark matter
Minimal Supersymmetric Standard Model
Astrophysics - Cosmology and Nongalactic Astrophysics
Zdroj: Eur.Phys.J.C
Eur.Phys.J.C, 2019, 79 (5), pp.395. ⟨10.1140/epjc/s10052-019-6837-x⟩
European Physical Journal
The European Physical Journal C
European Physical Journal C: Particles and Fields
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2019, 79 (5), pp.395. ⟨10.1140/epjc/s10052-019-6837-x⟩
European Physical Journal C: Particles and Fields, Vol 79, Iss 5, Pp 1-52 (2019)
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-019-6837-x⟩
Popis: 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 36 fb$^{-1}$ 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 $(m_{\tilde{\chi}_1^0}, m_{\tilde{\chi}_2^0}, m_{\tilde{\chi}_3^0}, m_{\tilde{\chi}_4^0})$ = (8-155, 103-260, 130-473, 219-502) GeV and chargino masses of $(m_{\tilde{\chi}_1^{\pm}}, m_{\tilde{\chi}_2^{\pm}})$ = (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 $3.3\sigma$, 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 2.9$\sigma$. 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.
Comment: 38 pages, 16 figures, v3 is the version accepted by EPJC
Databáze: OpenAIRE
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