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Abstract
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, , may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the , the measured value of the Higgs mass favours a limited range of (and also for if ) but the scalar mass is poorly constrained. In the wino-LSP case, is constrained to about and to , whereas in the Higgsino-LSP case has just a lower limit () and is constrained to in the () scenario. In neither case can the anomalous magnetic moment of the muon, , be improved significantly relative to its Standard Model (SM) value, nor do flavour measurements constrain the model significantly, and there are poor prospects for discovering supersymmetric particles at the LHC, though there are some prospects for direct DM detection. On the other hand, if the contributes only a fraction of the cold DM density, future LHC -based searches for gluinos, squarks and heavier chargino and neutralino states as well as disappearing track searches in the wino-like LSP region will be relevant, and interference effects enable to agree with the data better than in the SM in the case of wino-like DM with .
Details
1 DESY, Hamburg, Germany
2 Universidade de Santiago de Compostela, Santiago de Compostela, Spain
3 Science Laboratories, Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, UK; Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, Warsaw, Poland
4 High Energy Physics Group, Blackett Laboratory, Imperial College, London, UK
5 Fermi National Accelerator Laboratory, Batavia, IL, USA; Physics Department, University of Illinois at Chicago, Chicago, IL, USA
6 Experimental Physics Department, CERN, Geneva 23, Switzerland; Antwerp University, Wilrijk, Belgium
7 ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Melbourne, Australia
8 Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, UK; Theoretical Physics Department, CERN, Geneva 23, Switzerland
9 H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
10 Campus of International Excellence UAM+CSIC, Madrid, Spain; Instituto de Física Teórica UAM-CSIC, Madrid, Spain; Instituto de Física de Cantabria (CSIC-UC), Cantabria, Spain
11 Physik-Institut, Universität Zürich, Zurich, Switzerland
12 Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba, Japan
13 William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA