Heavy charged Higgs production

This page contains the code to generate events for charged Higgs production at the LHC.

Authors : Celine Degrande, Maria Ubiali, Marius Wiesemann, Marco Zaro

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Reference:

Heavy charged Higgs boson production at the LHC

3. Degrande, M. Ubiali, M. Wiesemann, M. Zaro. Jul 9, 2015. 32 pp.
   

e-Print: ​arXiv:1507.02549 [hep-ph]

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Instructions:

The process folders have to be placed directly inside the main folder (of the proper version) of MadGraph5_aMC@NLO (​​MG5_aMC homepage). Please extract the downloadable archive there or move the process folders there (do not copy the folder, since this may destroy the symbolic links).

Charged Higgs production in the intermediate mass range

This page contains instructions how to use the NLO predictions for charged Higgs production in the intermediate mass range and combine them with event generation at LO.

Authors : Celine Degrande, Rikkert Frederix, Valentin Hirschi, Maria Ubiali, Marius Wiesemann, Marco Zaro

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Reference:

Accurate predictions for charged Higgs production: closing the m_H^±∼mt window

3. Degrande, R. Frederix, V. Hirschi, M. Ubiali, M. Wiesemann, M. Zaro.
   

e-Print: ​arXiv:1607.05291 [hep-ph]

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Instructions:

The best we can do currently to model a charged Higgs signal in the intermediate mass range for this involved process (pp > b b H W) is to use the available NLO predictions for the total cross section and combine them with event generation at LO.

1) The state-of-the-art NLO predictions in the intermediate mass range, excluding contributions from scalar Higgses, can be downloaded for tan(beta) values of 0.1 to 60 for both type I and type II 2HDMs from the ​twiki page of the LHCHXSWG (charged Higgs subgroup)

2) Generate the process at LO without neutral Higgses to compute dσ_LO^no-neutral. Use the model file attached to this page (2HDMtypeIIymbMSbar.tar.gz DISCLAIMER: This model should be used only at LO, at NLO the MSbar scheme requires additional modifications of the code.) and extract it into the models folder.

details how to generate it with MG5_aMC:
MG5_aMC>import model 2HDMtypeIIymbMSbar
MG5_aMC>generate p p > h+ w- b b~ / h1 h2 h3
MG5_aMC>output HWbb_no-neutral
MG5_aMC>exit

The parameters in the cards should be chosen according to the LHC Higgs cross section working group recommendations.

3) Generate the process at LO including neutral Higgses to compute dσ_LO^with-neutral

details how to generate it with MG5_aMC:
MG5_aMC>import model 2HDMtypeIIymbMSbar
MG5_aMC>generate p p > h+ w- b b~
MG5_aMC>output HWbb_with-neutral
MG5_aMC>exit

The parameters in the cards should be chosen according to the LHC Higgs cross section working group recommendations.

4) Combine all contributions: reweight LO without neutral Higgses to NLO cross section and add neutral Higgs contribution at LO without reweighting:

dσ_final = dσ_LO^no-neutral*σ_NLO^no-neutral/σ_LO^no-neutral+(dσ_LO^with-neutral-dσ_LO^no-neutral)