Regular Article - Theoretical Physics

Collider Interplay for Supersymmetry, Higgs and Dark Matter

¹ High Energy Physics Group, Blackett Lab., Imperial College, Prince Consort Road, London, SW7 2AZ, UK
² Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, WC2R 2LS, UK
³ Physics Department, CERN, 1211, Geneva 23, Switzerland
⁴ BITS Pilani, Goa Campus, Goa, India
⁵ William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, Univ. of Minnesota, Minneapolis, MN, 55455, USA

^* e-mail: oliver.buchmueller@cern.ch

Received: 1 July 2015
Accepted: 9 September 2015
Published online: 1 October 2015

Abstract

We discuss the potential impacts on the CMSSM of future LHC runs and possible and higher-energy proton–proton colliders, considering searches for supersymmetry via   events, precision electroweak physics, Higgs measurements and dark matter searches. We validate and present estimates of the physics reach for exclusion or discovery of supersymmetry via searches at the LHC, which should cover the low-mass regions of the CMSSM parameter space favoured in a recent global analysis. As we illustrate with a low-mass benchmark point, a discovery would make possible accurate LHC measurements of sparticle masses using the MT2 variable, which could be combined with cross-section and other measurements to constrain the gluino, squark and stop masses and hence the soft supersymmetry-breaking parameters and of the CMSSM. Slepton measurements at CLIC would enable and to be determined with high precision. If supersymmetry is indeed discovered in the low-mass region, precision electroweak and Higgs measurements with a future circular collider (FCC-ee, also known as TLEP) combined with LHC measurements would provide tests of the CMSSM at the loop level. If supersymmetry is not discovered at the LHC, it is likely to lie somewhere along a focus-point, stop-coannihilation strip or direct-channel A / H resonance funnel. We discuss the prospects for discovering supersymmetry along these strips at a future circular proton–proton collider such as FCC-hh. Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.