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The \(b \to X_s \gamma\) rate and Higgs boson limits in the constrained minimal supersymmetric model

  • W. de Boer
  • M. Huber
  • A.V. Gladyshev
  • D.I. Kazakov
Technical physics

Abstract.

New NLO \(b \to X_s \gamma\) calculations have become available using resummed radiative corrections. Using these calculations we perform a global fit of the supergravity inspired constrained minimal supersymmetric model. We find that the resummed calculations show similar constraints as the LO calculations, namely that only with a relatively heavy supersymmetric mass spectrum of \(\mathcal{O}\)(1 TeV) the b\(\tau\) Yukawa unification and the \(b \to X_s \gamma\) rate can coexist in the large \(\tan\beta\) scenario. The resummed \(b \to X_s \gamma\) calculations are found to reduce the renormalization scale uncertainty considerably. The low \(\tan\beta\) scenario is excluded by the present Higgs limits from LEP II. The constraint from the Higgs limit in the \(m_0,m_{1/2}\) plane is severe, if the trilinear coupling \(A_0\) at the GUT scale is fixed to zero, but is considerably reduced for \(A_0\le -2m_0\). The relatively heavy SUSY spectrum required by \(b \to X_s \gamma\) corresponds to a Higgs mass of \(m_h=119\pm1 \mbox{(stop masses)} \pm2 ({\mathrm{theory}}) \pm3 \mbox{(top mass)}\) GeV in the CMSSM.

Keywords

Higgs Mass Renormalization Scale Scale Uncertainty Trilinear Coupling SUSY Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2001

Authors and Affiliations

  • W. de Boer
    • 1
  • M. Huber
    • 1
  • A.V. Gladyshev
    • 2
  • D.I. Kazakov
    • 2
  1. 1.Institut für Experimentelle Kernphysik, University of Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany DE
  2. 2.Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141 980 Dubna, Moscow Region, Russian Federation RU

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