Ann E. Nelson et al JHEP08(2002)039 doi:10.1088/1126-6708/2002/08/039
Ann E. Nelson1, Nuria Rius2, Veronica Sanz2 and Mithat Unsal1
Show affiliationsWe propose a supersymmetric extension of the standard model which is a realistic alternative to the MSSM, and which has several advantages. No ``μ'' supersymmetric Higgs/Higgsino mass parameter is needed for sufficiently heavy charginos. An approximate U(1)R symmetry naturally guarantees that tan β is large, explaining the top/bottom quark mass hierarchy. This symmetry also suppresses supersymmetric contributions to anomalous magnetic moments, b→sγ, and proton decay, and these processes place no lower bounds on superpartner masses, even at large tan β. The soft supersymmetry breaking mass parameters can easily be obtained from either gauge or Planck scale mediation, without the usual μ problem. Unlike in the MSSM, there are significant upper bounds on the masses of superpartners, including an upper bound of 114 GeV on the mass of the lightest chargino. However the MSSM bound on the lightest Higgs mass does not apply.
E-print Number: hep-ph/0206102
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12.60.Jv Supersymmetric models
Issue 08 (August 2002)
Received 27 June 2002, accepted for publication 26 August 2002
Published 10 September 2002
Ann E. Nelson et al JHEP08(2002)039
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