Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-10-02
Eur.Phys.J.C19:57-76,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
version submitted to EPJC; 34 pages and 6 figures. e-mail: renard@lpm.univ-montp2.fr
Scientific paper
10.1007/s100520100589
If the Standard Model (SM) Higgs particle is sufficiently heavy, then its contribution to gamma gamma to Z Z should be largely imaginary, interfering with the also predominantly imaginary SM "background" generated by the W-loop. For standard model Higgs masses in the region 200 \lsim m_H \lsim 500 GeV, this interference is found to be constructive and increasing the Higgs signal. In the minimal SUSY case an interference effect should also appear for the contribution of the heavier CP-even neutral Higgs boson H^0, provided it is sufficiently heavy. The effect is somewhat reduced though, by the smallness of the H^0 width and the gamma gamma and ZZ branching ratios. The interference is again found to be constructive for part of the parameter space corresponding to sfermion masses at the TeV scale and maximal stop mixing. For both the SM and SUSY cases, regions of the parameter space exist though, where the interference may be destructive. It is therefore essential to take these effects into account when searching for possible scalar Higgs-like candidates. To this aim, we present the complete analytic expressions for both resonance and background amplitudes.
Gounaris G. J.
Porfyriadis P. I.
Renard Fernand M.
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