Combined collider constraints on neutralinos and charginos

被引：58

作者：

Athron, Peter ^{[1
,2
]}

Balazs, Csaba ^{[1
,2
]}

Buckley, Andy ^{[3
]}

Cornell, Jonathan M. ^{[4
]}

Danninger, Matthias ^{[5
]}

Farmer, Ben ^{[6
]}

Fowlie, Andrew ^{[1
,2
,7
,8
]}

Gonzalo, Tomas E. ^{[9
]}

Harz, Julia ^{[10
]}

Jackson, Paul ^{[2
,11
]}

Kudzman-Blais, Rose ^{[5
]}

Kvellestad, Anders ^{[6
,9
]}

Martinez, Gregory D. ^{[12
]}

Petridis, Andreas ^{[2
,11
]}

Raklev, Are ^{[9
]}

Rogan, Christopher ^{[13
]}

Scott, Pat ^{[6
]}

Sharma, Abhishek ^{[2
,11
]}

White, Martin ^{[2
,11
]}

Zhang, Yang ^{[1
,2
]}

机构：

[1] Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia

[2] Australian Res Council, Ctr Excellence Particle Phys Tera Scale, Melbourne, Vic, Australia

[3] Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[4] McGill Univ, Dept Phys, 3600 Rue Univ, Montreal, PQ H3A 2T8, Canada

[5] Univ British Columbia, Dept Phys, Vancouver, BC, Canada

[6] Imperial Coll London, Dept Phys, Blackett Lab, Prince Consort Rd, London SW7 2AZ, England

[7] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China

[8] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Jiangsu, Peoples R China

[9] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[10] LPTHE CNRS UPMC, Boite 126,T13-14 4e Etage,4 Pl Jussieu, F-75252 Paris 05, France

[11] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia

[12] Univ Calif Los Angeles, Phys & Astron Dept, Los Angeles, CA 90095 USA

[13] Univ Kansas, Dept Phys & Astron, Malott Hall, Lawrence, KS 66045 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 2019年 / 79卷 / 05期

基金：

加拿大自然科学与工程研究理事会; 澳大利亚研究理事会; 欧盟地平线“2020”;

关键词：

SUSY QCD CORRECTIONS; GRAND UNIFICATION; SYMMETRY-BREAKING; MASS; SUPERSYMMETRY; NATURALNESS; PROGRAM; SEARCH; DECAYS; NUMBER;

D O I：

10.1140/epjc/s10052-019-6837-x

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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 of 13TeV 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 3.3 sigma, subject to a number of cautions. If one includes LHC searches for charginos and neutralinos conducted with 8TeV 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.

引用

页数：52

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