CPconserving twoHiggsdoublet model: The approach to the decoupling limit
Abstract
A CPeven neutral Higgs boson with standardmodellike couplings may be the lightest scalar of a twoHiggsdoublet model. We study the decoupling limit of the most general CPconserving twoHiggsdoublet model, where the mass of the lightest Higgs scalar is significantly smaller than the masses of the other Higgs bosons of the model. In this case, the properties of the lightest Higgs boson are nearly indistinguishable from those of the standard model Higgs boson. The first nontrivial corrections to Higgs boson couplings in the approach to the decoupling limit are also evaluated. The importance of detecting such deviations in precision Higgs boson measurements at future colliders is emphasized. We also clarify the case in which a neutral Higgs boson can possess standardmodellike couplings in a regime where the decoupling limit does not apply. The twoHiggsdoublet sector of the minimal supersymmetric model illustrates many of the above features.
 Publication:

Physical Review D
 Pub Date:
 April 2003
 DOI:
 10.1103/PhysRevD.67.075019
 arXiv:
 arXiv:hepph/0207010
 Bibcode:
 2003PhRvD..67g5019G
 Keywords:

 14.80.Cp;
 12.60.Fr;
 12.60.Jv;
 14.80.Bn;
 Nonstandardmodel Higgs bosons;
 Extensions of electroweak Higgs sector;
 Supersymmetric models;
 Standardmodel Higgs bosons;
 High Energy Physics  Phenomenology
 EPrint:
 54 pages, 2 tables, revtex4 format, some new material added (including elegant forms for the threeHiggs and fourHiggs couplings) and typographical errors fixed