Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-24
Nucl.Phys. B550 (1999) 77-98
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, latex, eps-figures included
Scientific paper
10.1016/S0550-3213(99)00189-3
We show in this paper that the 1/N expansion is a reliable tool to calculate the properties of a heavy Higgs boson. The 1/N expansion sums up all orders in perturbation theory, and therefore avoids the renormalization scheme dependence of the conventional perturbative approach. It is explained how effects due to the Landau pole of the Higgs sector are isolated and subtracted, and how to perform actual calculations, by computing the Higgs line shape for the processes f\bar f\to H \to ZZ,f'\bar f' at next-to-leading order in the 1/N expansion. The results are compared to the perturbative results to show the agreement between the perturbative and the nonperturbative approach for Higgs masses up to 1 TeV. We conclude that the theoretical predictions for Higgs observables are well under control for the entire kinematical region of the LHC.
Binoth Thomas
Ghinculov Adrian
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