Frequentist analysis of the parameter space of minimal supergravity

The European Physical Journal C

A. De Roeck¹  J. R. Ellis²  G. Weiglein³  H. Flächer⁴  R. Cavanaugh⁵  O. Buchmueller⁶  D. Colling⁶  S. Rogerson⁶  M. J. Dolan⁷  F. J. Ronga⁸  S. Heinemeyer⁹  K. A. Olive^1,10 

[1] Antwerp University, 2610, Wilrijk, Belgium;CERN, 1211, Genève 23, Switzerland;CERN, 1211, Genève 23, Switzerland;Theoretical Physics and Cosmology Group, Department of Physics, King’s College London, WC2R 2LS, London, UK;DESY, Notkestrasse 85, 22607, Hamburg, Germany;Department of Physics and Astronomy, University of Rochester, 14627, Rochester, NY, USA;Fermi National Accelerator Laboratory, P.O. Box 500, 60510, Batavia, IL, USA;Physics Department, University of Illinois at Chicago, 60607-7059, Chicago, IL, USA;High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, SW7 2AZ, London, UK;Institute for Particle Physics Phenomenology, University of Durham, South Road, DH1 3LE, Durham, UK;Institute for Particle Physics, ETH Zürich, 8093, Zürich, Switzerland;Instituto de Física de Cantabria (CSIC-UC), 39005, Santander, Spain;William I. Fine Theoretical Physics Institute, University of Minnesota, 55455, Minneapolis, MN, USA;

关键词: Dark Matter;    High Energy Phys;    Anomalous Magnetic Moment;    Light Neutralino;    Gravitino Mass;   

DOI  :  10.1140/epjc/s10052-011-1583-8

来源: Springer

【 摘 要 】

We make a frequentist analysis of the parameter space of minimal supergravity (mSUGRA), in which, as well as the gaugino and scalar soft supersymmetry-breaking parameters being universal, there is a specific relation between the trilinear, bilinear and scalar supersymmetry-breaking parameters, A0=B0+m0, and the gravitino mass is fixed by m3/2=m0. We also consider a more general model, in which the gravitino mass constraint is relaxed (the VCMSSM). We combine in the global likelihood function the experimental constraints from low-energy electroweak precision data, the anomalous magnetic moment of the muon, the lightest Higgs boson mass Mh, B physics and the astrophysical cold dark matter density, assuming that the lightest supersymmetric particle (LSP) is a neutralino. In the VCMSSM, we find a preference for values of m1/2 and m0 similar to those found previously in frequentist analyses of the constrained MSSM (CMSSM) and a model with common non-universal Higgs masses (NUHM1). On the other hand, in mSUGRA we find two preferred regions: one with larger values of both m1/2 and m0 than in the VCMSSM, and one with large m0 but small m1/2. We compare the probabilities of the frequentist fits in mSUGRA, the VCMSSM, the CMSSM and the NUHM1: the probability that mSUGRA is consistent with the present data is significantly less than in the other models. We also discuss the mSUGRA and VCMSSM predictions for sparticle masses and other observables, identifying potential signatures at the LHC and elsewhere.

【 授权许可】

Unknown