Higgs scalarpseudoscalar mixing in the minimal supersymmetric Standard Model
Abstract
In the minimal supersymmetric Standard Model, the heaviest CPeven Higgs boson H and the CPodd Higgs scalar A are predicted to be almost degenerate in mass at the tree level, for the wide kinematic range M_{A}>2M_{Z} and tanβ>=2. However, if large softCPviolating Yukawa interactions involving scalar quarks of the third generation are present in the theory, then the CP invariance of the Higgs potential can be maximally broken beyond the Born approximation, and the high degree of mass degeneracy between H and A may be lifted through a sizeable HA mixing. After taking the CPodd tadpole renormalization of the A boson into account, we find that the small mass difference M_{H}M_{A}, which is about 1% of the Aboson mass at the tree level, can be substantially enhanced to the 25% level at the oneloop order. We also find that the loopinduced mixing between the lightest CPeven Higgs boson h and the A boson may be of comparable size to M_{h}. We briefly discuss the main phenomenological implications of the predicted hA and HA mixings for the general Higgsboson mass spectrum and for CPviolating observables at collider and lower energies.
 Publication:

Physics Letters B
 Pub Date:
 September 1998
 DOI:
 10.1016/S03702693(98)007710
 arXiv:
 arXiv:hepph/9805373
 Bibcode:
 1998PhLB..435...88P
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 17 pages, LaTeX, 3 encapsulated figures included