Eur. Phys. J. C 25, 297-305 (2002)
Masses and couplings of the lightest Higgs bosons in ( M+1)SSMU. Ellwanger and C. Hugonie
Laboratoire de Physique Théorique (Unité mixte de Recherche (UMR 8627).) , Université de Paris XI, 91405 Orsay Cedex, France
(Received: 7 September 1999 / Published online: 12 July 2002 )
We study the upper limits on the mass of the lightest and second lightest CP even Higgs bosons in the ( M+1)SSM, the MSSM extended by a gauge singlet. The dominant two loop contributions to the effective potential are included, which reduce the Higgs masses by GeV. Since the coupling R of the lightest Higgs scalar to gauge bosons can be small, we study in detail the relations between the masses and couplings of both lightest scalars. We present upper bounds on the mass of a "strongly" coupled Higgs ( R > 1/2 ) as a function of lower experimental limits on the mass of a "weakly" coupled Higgs ( R < 1/2). With the help of these results, the whole parameter space of the model can be covered by Higgs boson searches.
© Società Italiana di Fisica, Springer-Verlag 2002