Higgs scalars in the minimal nonminimal supersymmetric standard model
Abstract
We consider the simplest and most economic version among the proposed nonminimal supersymmetric models, in which the μ parameter is promoted to a singlet superfield, whose selfcouplings are all absent from the renormalizable superpotential. Such a particularly simple form of the renormalizable superpotential may be enforced by discrete R symmetries which are extended to the gravityinduced nonrenormalizable operators as well. We show explicitly that within the supergravitymediated supersymmetrybreaking scenario, the potentially dangerous divergent tadpoles associated with the presence of the gauge singlet first appear at loop levels higher than 5 and therefore do not destabilize the gauge hierarchy. The model provides a natural explanation for the origin of the μ term, without suffering from the visible axion or the cosmological domainwall problem. Focusing on the Higgs sector of this minimal nonminimal supersymmetric standard model, we calculate its effective Higgs potential by integrating out the dominant quantum effects due to top squarks. We then discuss the phenomenological implications of the Higgs scalars predicted by the theory for the present and future highenergy colliders. In particular, we find that our new minimal nonminimal supersymmetric model can naturally accommodate a relatively light charged Higgs boson, with a mass close to the present experimental lower bound.
 Publication:

Physical Review D
 Pub Date:
 March 2001
 DOI:
 10.1103/PhysRevD.63.055003
 arXiv:
 arXiv:hepph/0008268
 Bibcode:
 2001PhRvD..63e5003P
 Keywords:

 12.60.Jv;
 Supersymmetric models;
 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 63 pages (12 figures), extended version