Eur. Phys. J. C 20, 689-694 (2001)
DOI: 10.1007/s100520100695

The rate and Higgs boson limits in the constrained minimal supersymmetric model

W. de Boer¹, M. Huber¹, A.V. Gladyshev² and D.I. Kazakov<sup>2

1</sup>  Institut für Experimentelle Kernphysik, University of Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany
²  Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141 980 Dubna, Moscow Region, Russian Federation

(Received: 14 February 2001 / Revised version: 22 March 2001 / Published online: 29 June 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

Abstract
New NLO 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 (1 TeV) the b- Yukawa unification and the rate can coexist in the large scenario. The resummed calculations are found to reduce the renormalization scale uncertainty considerably. The low scenario is excluded by the present Higgs limits from LEP II. The constraint from the Higgs limit in the m₀,m_1/2 plane is severe, if the tri li near coupling A₀ at the GUT scale is fixed to zero, but is considerably reduced for . The relatively heavy SUSY spectrum required by corresponds to a Higgs mass of GeV in the CMSSM.

© Società Italiana di Fisica, Springer-Verlag 2001