Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-09
Nucl.Phys.B805:267-286,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 4 figures; v2 to appear in Nucl.Phys.B; v3 minor corrections, note added in section 3.3
Scientific paper
10.1016/j.nuclphysb.2008.07.022
We present explicit analytic results for the two-loop top/stop/gluino contributions to the cross section for the production of CP-even Higgs bosons via gluon fusion in the MSSM, under the approximation of neglecting the Higgs boson mass with respect to the masses of the particles circulating in the loops. The results are obtained employing the low-energy theorem for Higgs interactions adapted to the case of particle mixing. We discuss the validity of the approximation used by computing the first-order correction in an expansion in powers of the Higgs boson mass. We find that, for the lightest CP-even Higgs boson, the gluino contribution is very well approximated by the result obtained in the limit of vanishing Higgs mass. As a byproduct of our calculation, we provide results for the two-loop QCD contributions to the photonic Higgs decay.
Degrassi Giuseppe
Slavich Pietro
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