Eur. Phys. J. C (2017) 77: 104
https://doi.org/10.1140/epjc/s10052-017-4639-6

Regular Article - Theoretical Physics

Likelihood analysis of supersymmetric SU(5) GUTs

¹ DESY, Notkestraße 85, 22607, Hamburg, Germany
² High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ, UK
³ Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK
⁴ Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warsaw, Poland
⁵ Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain
⁶ Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, USA
⁷ Physics Department, University of Illinois at Chicago, Chicago, IL, 60607-7059, USA
⁸ Experimental Physics Department, CERN, 1211, Geneva 23, Switzerland
⁹ Antwerp University, 2610, Wilrijk, Belgium
¹⁰ ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Parkville, 3010, Australia
¹¹ Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, WC2R 2LS, UK
¹² Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland
¹³ H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
¹⁴ Campus of International Excellence UAM+CSIC, Cantoblanco, 28049, Madrid, Spain
¹⁵ Instituto de Física Teórica UAM-CSIC, C/Nicolas Cabrera 13-15, 28049, Madrid, Spain
¹⁶ Instituto de Física de Cantabria (CSIC-UC), Avda. de Los Castros s/n, 39005, Santander, Spain
¹⁷ Physik-Institut, Universität Zürich, 8057, Zurich, Switzerland
¹⁸ William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA

^* e-mail: emanuele.bagnaschi@desy.de

Received: 16 November 2016
Accepted: 19 January 2017
Published online: 16 February 2017

Abstract

We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass , distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), and , and for the and Higgs representations and , a universal trilinear soft SUSY-breaking parameter , and the ratio of Higgs vevs . In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + [see pdf] events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.