Eur. Phys. J. C (2012) 72: 2243
https://doi.org/10.1140/epjc/s10052-012-2243-3

Regular Article - Theoretical Physics

The CMSSM and NUHM1 in light of 7 TeV LHC, B _s →μ ⁺ μ ⁻ and XENON100 data

¹ High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ, UK
² LHC Physics Center at Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, USA
³ Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, USA
⁴ Physics Department, University of Illinois at Chicago, Chicago, IL, 60607-7059, USA
⁵ Physics Department, CERN, 1211, Genève 23, Switzerland
⁶ Antwerp University, 2610, Wilrijk, Belgium
⁷ Institute for Particle Physics Phenomenology, University of Durham, South Road, Durham, DH1 3LE, UK
⁸ Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, WC2R 2LS, UK
⁹ H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
¹⁰ Instituto de Física de Cantabria (CSIC-UC), 39005, Santander, Spain
¹¹ INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044, Frascati, Italy
¹² William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA
¹³ Institute for Particle Physics, ETH Zürich, 8093, Zürich, Switzerland
¹⁴ DESY, Notkestrasse 85, 22607, Hamburg, Germany

^* e-mail: olive@physics.umn.edu

Received: 14 August 2012
Revised: 8 October 2012
Published online: 30 November 2012

Abstract

We make a frequentist analysis of the parameter space of the CMSSM and NUHM1, using a Markov Chain Monte Carlo (MCMC) with 95 (221) million points to sample the CMSSM (NUHM1) parameter spaces. Our analysis includes the ATLAS search for supersymmetric jets + /E_T signals using ∼5/fb of LHC data at 7 TeV, which we apply using PYTHIA and a Delphes implementation that we validate in the relevant parameter regions of the CMSSM and NUHM1. Our analysis also includes the constraint imposed by searches for BR(B _s →μ ⁺ μ ⁻) by LHCb, CMS, ATLAS and CDF, and the limit on spin-independent dark matter scattering from 225 live days of XENON100 data. We assume M _h ∼125 GeV, and use a full set of electroweak precision and other flavour-physics observables, as well as the cold dark matter density constraint. The ATLAS_5/fb constraint has relatively limited effects on the 68 and 95 % CL regions in the (m ₀,m _1/2) planes of the CMSSM and NUHM1. The new BR(B _s →μ ⁺ μ ⁻) constraint has greater impacts on these CL regions, and also impacts significantly the 68 and 95 % CL regions in the (M _A ,tanβ) planes of both models, reducing the best-fit values of tanβ. The recent XENON100 data eliminate the focus-point region in the CMSSM and affect the 68 and 95 % CL regions in the NUHM1. In combination, these new constraints reduce the best-fit values of m ₀,m _1/2 in the CMSSM, and increase the global χ ² from 31.0 to 32.8, reducing the p-value from 12 % to 8.5 %. In the case of the NUHM1, they have little effect on the best-fit values of m ₀,m _1/2, but increase the global χ ² from 28.9 to 31.3, thereby reducing the p-value from 15 % to 9.1 %.