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arXiv · 1112.5517

The Higgs Boson Lineshape

Stefano Goria·Giampiero Passarino·Dario Rosco
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Abstract

The current searches for a heavy Higgs boson assume on-shell (stable) Higgs-boson production. The Higgs-boson production cross section is then sampled with a Breit-Wigner distribution (with fixed-width or running-width) and implemented in MonteCarlo simulations. Therefore the question remains of what is the limitation of the narrow Higgs-width approximation. The main focus of this work is on the description of the Standard Model Higgs--boson-lineshape in the heavy Higgs region, typically $\MH$ above $600\UGeV$. The framework discussed in this paper is general enough and can be used for all processes and for all kinematical regions. Numerical results are shown for the gluon-fusion process. Issues of gauge invariance and residual theoretical uncertainties are also discussed. Limitations due to a breakdown of the perturbative expansion are comprehensively discussed, including a discussion of th equivalence theorem for (off-shell) virtual vector-bosons. Analytic continuation in a theory with unstable particles is thoroughly discussed.

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Stefano Goria, Giampiero Passarino, Dario Rosco. 2012-05-09. The Higgs Boson Lineshape. https://doi.org/10.1016/j.nuclphysb.2012.07.006

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