Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-11
Nucl.Phys.B643:79-92,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 4 figures. Version to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(02)00748-4
We compute the O(ab*as) two-loop corrections to the neutral Higgs boson masses in the Minimal Supersymmetric Standard Model, using the effective potential approach. Such corrections can be important in the region of parameter space corresponding to tan(beta)>>1 and sizeable mu. In spite of the formal analogy with the O(at*as) corrections, there are important differences, since the dominant effects are controlled by the sbottom-Higgs scalar couplings. We propose a convenient renormalization scheme that avoids unphysically large threshold effects associated with the bottom mass, and absorbs the bulk of the O(ab*as + ab*at) corrections into the one-loop expression. We give general explicit formulae for the O(ab*as) corrections to the neutral Higgs boson mass matrix. We also discuss the importance of the O(ab^2) corrections and derive a formula for their contribution to mh in a simple limiting case.
Brignole Andrea
Degrassi Giuseppe
Slavich Pietro
Zwirner Fabio
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