Eur. Phys. J. C (2012) 72: 1878
https://doi.org/10.1140/epjc/s10052-012-1878-4

Regular Article - Theoretical Physics

Supersymmetry in light of 1/fb of LHC data

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

^* e-mail: Sven.Heinemeyer@cern.ch

Received: 24 October 2011
Revised: 6 January 2012
Published online: 7 February 2012

Abstract

We update previous frequentist analyses of the CMSSM and NUHM1 parameter spaces to include the public results of searches for supersymmetric signals using ∼1/fb of LHC data recorded by ATLAS and CMS and ∼0.3/fb of data recorded by LHCb in addition to electroweak precision and B-physics observables. We also include the constraints imposed by the cosmological dark matter density and the XENON100 search for spin-independent dark matter scattering. The LHC data set includes ATLAS and CMS searches for jets + [InlineEquation not available: see fulltext.] events and for the heavier MSSM Higgs bosons, and the upper limits on BR(B _s →μ ⁺ μ ⁻) from LHCb and CMS. The absences of jets + [InlineEquation not available: see fulltext.] signals in the LHC data favour heavier mass spectra than in our previous analyses of the CMSSM and NUHM1, which may be reconciled with (g−2) _μ if tanβ∼40, a possibility that is, however, under pressure from heavy Higgs searches and the upper limits on BR(B _s →μ ⁺ μ ⁻). As a result, the p-value for the CMSSM fit is reduced to ∼15(38)%, and that for the NUHM1 to ∼16(38)%, to be compared with ∼9(49)% for the Standard Model limit of the CMSSM for the same set of observables (dropping (g−2) _μ ), ignoring the dark matter relic density. We discuss the sensitivities of the fits to the (g−2) _μ and BR(b→sγ) constraints, contrasting fits with and without the (g−2) _μ constraint, and combining the theoretical and experimental errors for BR(b→sγ) linearly or in quadrature. We present predictions for , BR(B _s →μ ⁺ μ ⁻), M _h and M _A , and update predictions for spin-independent dark matter scattering, incorporating the uncertainty in the π-nucleon σ term Σ _πN . Finally, we present predictions based on our fits for the likely thresholds for sparticle pair production in e ⁺ e ⁻ collisions in the CMSSM and NUHM1.