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Extended Higgs Sector Subgroup of LHC HWG - WORK IN PROGRESS

The Extended Higgs Sector subgroup is responsible for providing support and recommendations for issues related to the (work in progress).


Group conveners:

Lidija Zivkovic (Belgrade) Mariarosaria d'Alfonso (MIT) Shufang Su (Arizona)
Nikolaos Rompotis (Liverpool) Jan Steggemann (EPFL) Rui Santos (Lisbon)
    Tania Robens (Zagreb)

The conveners can be reached at, but only if you already subscribed to the mailing list for the NMSSM subgroup, BSM Higgs (WG3) group, or the general HXSWG. Please see here for more details.


Indico page of the NMSSM subgroup

Mailing lists

How to subscribe to mailing lists

The mail address for the NMSSM Group is All messages are archived here.

We recommend to also subscribe to the BSM Higgs mailing list ( and the general HXSWG mailing list (

The conveners can be reached at, but only if you already subscribed to the mailing list for the NMSSM subgroup, BSM Higgs (WG3) group, or the general HXSWG mentioned above.

SVN repository

The SVN repository for the NMSSM group is at:

If you need to need read or write permissions, please contact the conveners.

Spectrum Calculators

The spectrum calculators under investigation are described at NMSSMSpectrumCalculators.

Benchmark discussions

Updated recommendations March 2020

The information listed here is still under review. Do not use it yet. The March 2020 benchmarks are shown in NMSSMBenchmarksMarch2020.

Post YR4 considerations

The discussion after the Yellow Report 4 has focused on two objectives:

  • Answer the following question: Is it possible to produce meaningful parameter space planes in a similar way as in the case of the very successful MSSM benchmarks?
  • Motivate signatures that are not searched for in the experiments by providing evidence through parameter space scans that there is phase space for which such signatures are accessible in terms of sensitivity.

There is on-going work regarding the search for MSSM-benchmark planes, however, it seems that such a task is very difficult to achieve and most probably a more meaningful/realistic target is the second objective.

With respect to the 2nd objective, there is past and ongoing work to produce evidence from parameter space scans about signatures that are covered and not covered by the experiments. For example, see this paper 1408.1120. New benchmark lines for various final states for H3->H2+H1 can be found in NMSSMBenchmarksPostYR4 and the attachments below.

YR4 points

In the context of Yellow Report 4 the group has studied individual points in the NMSSM parameter space. All the points are described in detail at NMSSMBenchmarkPoints.

  • Theory: [[mailto:][]], [[mailto:][]], [[mailto:][]].
  • Twiki containing BRs numbers for H+->cb in the 3HDM: Hplus3HDM.
  • Twiki containing cross section and BRs numbers for 2HDM: LHCHWG2HDM.
  • Twiki containing cross section and BRs numbers for flavorful 2HDM: LHCHWG3Flavorful2HDM.
  • Twiki for LFV Higgs decay in BGL.
  • Twiki for 2HDM benchmarks.
  • Twiki for the Georgi-Machacek model.
  • Twiki for benchmarks other than 2HDM
  • Twiki for the width and interference treatment recommended for a common treatment for ATLAS and CMS analyses.
  • Twiki for MSSM charged Higgs (heavy, light, intermediate masses).
  • Check physics case for 3HDM, LRS, CPV, SM+Triplet models, in case provide cross sections and BRs: Santos to write short summary of which code is good for which
  • Interface theory constraints for an additional singlet into ScannerS: done. Santos to add more info.
  • Cross sections and BRs for 2HDM+singlet models (real & complex): Nikos Rompotis.
  • Inclusion of 2HDM electroweak baryogenesis information in electroweak phase transition properties by using the BSMPT code by Maggie: Maggie, Nikos Rompotis.
  • Theoretical predictions for interference effects for large width charged Higgs decays: done. Santos to write a short description of regions of parameter space that have large interference effects.
  • Expand 2HDM/MSSM H+ cross sections from 2 two 3 TeV: contact.
  • Provide benchmark scenarios for searches for H5 states in GM for masses below 200GeV: Heather Logan
  • Provide simulation tool for loop-induced H+->W+ gamma with fermiophobic H+ in GM: Heather Logan
  • Email all the contacts here.
  • Dedicated Twiki page with detailed information.
  • Tasks discussed in the group and timelines:

Task Involved persons Status Timescale
Keep an eye on potentially missing signatures   In progress Continuous

Twiki revisions

-- LidijaZivkovic - 2021-03-10

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Topic revision: r1 - 2021-03-10 - LidijaZivkovic
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