Eur. Phys. J. C (2017) 77: 824
https://doi.org/10.1140/epjc/s10052-017-5167-0

Regular Article - Theoretical Physics

Global fits of GUT-scale SUSY models with GAMBIT

¹ School of Physics and Astronomy, Monash University, Melbourne, VIC, 3800, Australia
² Australian Research Council Centre of Excellence for Particle Physics at the Tera-scale, Australia, http://www.coepp.org.au/
³ Department of Physics, University of Oslo, 0316, Oslo, Norway
⁴ SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
⁵ Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
⁶ Polish Academy of Sciences, H. Niewodniczański Institute of Nuclear Physics, 31-342, Kraków, Poland
⁷ Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 10691, Stockholm, Sweden
⁸ Department of Physics, Stockholm University, 10691, Stockholm, Sweden
⁹ Department of Physics, McGill University, 3600 rue University, Montréal, QC, H3A 2T8, Canada
¹⁰ Department of Physics, University of Adelaide, Adelaide, SA, 5005, Australia
¹¹ NORDITA, Roslagstullsbacken 23, 10691, Stockholm, Sweden
¹² ENS de Lyon, Centre de Recherche Astrophysique de Lyon UMR5574, Univ Lyon, Univ Lyon 1, CNRS, 69230, Saint-Genis-Laval, France
¹³ Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
¹⁴ Physics and Astronomy Department, University of California, Los Angeles, CA, 90095, USA
¹⁵ LAPTh, Université de Savoie, CNRS, 9 chemin de Bellevue, B.P.110, 74941, Annecy-le-Vieux, France
¹⁶ Department of Physics, Harvard University, Cambridge, MA, 02138, USA
¹⁷ Instituto de Física Corpuscular, IFIC-UV/CSIC, Valencia, Spain
¹⁸ Faculty of Engineering and Information Technologies, Centre for Translational Data Science, School of Physics, The University of Sydney, Camperdown, NSW, 2006, Australia
¹⁹ Department of Physics, Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK
²⁰ GRAPPA, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands

^* e-mail: peter.athron@coepp.org.au

Received: 22 May 2017
Accepted: 24 August 2017
Published online: 4 December 2017

Abstract

We present the most comprehensive global fits to date of three supersymmetric models motivated by grand unification: the constrained minimal supersymmetric standard model (CMSSM), and its Non-Universal Higgs Mass generalisations NUHM1 and NUHM2. We include likelihoods from a number of direct and indirect dark matter searches, a large collection of electroweak precision and flavour observables, direct searches for supersymmetry at LEP and Runs I and II of the LHC, and constraints from Higgs observables. Our analysis improves on existing results not only in terms of the number of included observables, but also in the level of detail with which we treat them, our sampling techniques for scanning the parameter space, and our treatment of nuisance parameters. We show that stau co-annihilation is now ruled out in the CMSSM at more than 95% confidence. Stop co-annihilation turns out to be one of the most promising mechanisms for achieving an appropriate relic density of dark matter in all three models, whilst avoiding all other constraints. We find high-likelihood regions of parameter space featuring light stops and charginos, making them potentially detectable in the near future at the LHC. We also show that tonne-scale direct detection will play a largely complementary role, probing large parts of the remaining viable parameter space, including essentially all models with multi-TeV neutralinos.