The Higgs-boson lineshape☆
By Stefano Goria, G. Passarino, D. Rosco. 2011
136 citations recorded by the source corpus.
Abstract The heavy Higgs searches at LHC are carried out in g g → H → W W → l ν l ν , g g → H → Z Z → l l l l , l l ν ν , l l q q channels. 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 Monte Carlo 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 M H above 600 GeV . 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 the equivalence theorem for (off-shell) virtual vector-bosons. Analytic continuation in a theory with unstable particles is thoroughly discussed.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/5f2af5c51c9b9e74f5a92b311be06f881fd44061
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In Nuclear and High Energy Physics
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- Gudrun Heinrich
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