Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-05-19
Phys.Lett.B435:88-100,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, LaTeX, 3 encapsulated figures included
Scientific paper
10.1016/S0370-2693(98)00771-0
In the minimal supersymmetric Standard Model, the heaviest CP-even Higgs boson H and the CP-odd 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 \tan\beta \ge 2. However, if large soft-CP-violating 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 CP-odd 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 A-boson mass at the tree level, can be substantially enhanced to the 25% level at the one-loop order. We also find that the loop-induced mixing between the lightest CP-even 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 Higgs-boson mass spectrum and for CP-violating observables at collider and lower energies.
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