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LHC HXSWG for BSM Higgs (WG3)

LHCHXSWG3 is responsible to provide support and recommendations for BSM Higgs related issues.

Group organization

Group conveners:

Anna Goussiou (Seattle) (2018) David Sperka (Boston University) (2018) Zhen Liu (U of Maryland) (2019) Pietro Slavich (LPTHE) (2017)
The conveners can be globally reached at the address (only if you already subscribed to the WG3 mailing list or the general HXSWG mailing list, see here).

The WG has appointed contacts for several topics which are of interest to the group:

Extended Higgs Sector (neutral + charged Higgs bosons):

Task Involved persons Status Timescale
Check physics case for 3HDM, LRS, CPV, SM+Triplet models, in case provide cross sections and BRs   Planned  
Provide benchmark scenarios for searches for H5 states in GM for masses below 200GeV Heather Logan In progress Oct 24, 2018
Provide simulation tool for loop-induced H+->W+ gamma with fermiophobic H+ in GM Heather Logan Done (need to document) Mid 2018
Interface theory constraints for an additional singlet into ScannerS Rui Santos Done End 2017
Provide cross sections and BRs for 2HDM+singlet models (real & complex) Nikos Rompotis Ready (produce on request) End 2017
Prioritize channels according to importance for end of LHC run2/3 or HL-LHC Shufang Su In progress End 2018
Keep an eye on potentially missing signatures   In progress Continuous
Provide cross sections for charged Higgs pair production (Drell-Yan) Heather Logan Planned End 2018?
Inclusion of 2HDM electroweak baryogenesis information in electroweak phase transition properties by using the BSMPT code by Maggie. Nikos Rompotis Planned Oct 2018
Provide a model to interpret s-channel and charged Higgs pair production   In progress  
Provide theoretical predictions for interference effects for large width charged Higgs decays Rui Santos In progress End 2018

MSSM Higgs

Task Involved persons Status Timescale
Update SM parameters for MSSM calculations to be consistent with YR recommendations for SM calculations   Complete Sept 2018
Provide new MSSM benchmark scenarios   Complete Sept 2018
Provide updated ROOT files for end RunII analyses   In progress End 2018
Provide description and common tool for BSM Higgs pT calculation @ NLO+PS precision for gluon fusion   In progress (link) Sept/Oct 2018
Provide benchmark scenario for low tanb using EFT approach   Planned End 2018
Prioritize channels according to importance for end of LHC run2/3 or HL-LHC   Planned End 2018
Keep an eye on potentially missing signatures   In progress Continuous


Task Involved persons Status Timescale
Re-interpetation of public experimental results Theorists In progress Continuous
Identification of NMSSM specific signatures not searched for by ATLAS/CMS All In progress Milestone: Dec 2018 summary
Benchmark lines/plans/bands for ATLAS/CMS All In progress Milestone: Dec 2018 summary
LHCHXSWG internal note to document benchmarks All In progress to start if benchmarks are used

Exotic Higgs Decays

Task Involved persons Status Timescale
Provide a benchmark for interpretations of h->aa->4y/2g2y searches need volunteers Proposed  
Study feasibility for searches for Higgs decays involving one or more displaced vertices. All Planned June 2019
Add feasibility studies for Higgs rare decays beyond gamma+J/Psi, gamma+phi, gamma+Upsilon Experimentalists In progress within collaborations Full Run 2 papers
Add feasibility studies for h->2f+MET and develop benchmark scenarios predicting this type of signatures All In progress Spring 2019
Reinterpret prompt decays results for LLP signatures Experimentalists In progress within collaborations Full Run 2 papers
What is the best way to present Higgs searches with displaced vertices to allow a simple recast by theorists? Jessie Shelton, Zhen Liu, Cecile Caillol In progress End of 2019
Provide final recommendations for h->W/Z+meson: link Zhen Liu, Stefan Alte under review  
Providing the tool for the experimentalists to calculate Br(H->aa->xxyy) for different 2HDM+S scenarios (from arXiv:1802.02156 authors) Note: Instead of a tool, ready to use txt files provided for multiple tan(beta) values. Ljiljana Morvaj DONE End of summer 2018

Other groups

Other useful information for LHC HXSG task forces/sub-groups that are relevant to WG3 activities:

  • Branching ratio sub-group: twiki is here, contact them by clicking here
  • Di-Higgs sub-group: twiki is here, contact them by clicking here.

SVN repository and tools

There is an SVN repository in which various WG3 items are stored. For the time being the following folders are

  • 2HDM
  • MSSM for neutral and charged Higgs

If you need to put something on SVN or you have some question please contact the WG3 conveners.

The list of the notes (public, interim recommendations and internal) is here.


Indico page of the WG3

Mailing lists

How to subscribe to mailing lists

The mail address for the WG3 is All messages are archived here.

We highly recomment to also be subscribed to the general HXSWG mailing list:

The conveners can be reached at, but only if you already subscribed to either the WG3 mailing list or the generic lhc-higgs HXSWG mailing list.

WG3 related documentation

All the documents, public and internal can be found in the LHC HXSG Library.

  • arXiv:1607.05291: Intermediate mass region for charged Higgs production, Celine Degrande, Rikkert Frederix, Valentin Hirschi, Maria Ubiali, Marius Wiesemann, Marco Zaro.
  • LHCHXSWG-2015-002: public note on low tanbeta MSSM scenarios.
  • The 10th workshop of the LHC HXSG has a good overview of the topics studied in WG3 up to July 2015.
  • Low tanbeta scenarios note LHCHXSWG-INT-2015-004 , to become public soon.
  • Georgi-Machacek VBF H+ -> WZ Public LHC HXSG note LHCHXSWG-2015-001.
  • Heavy charged Higgs cross sections update: Martin Flechl, Richard Klees, Michael Kr\"amer, Michael Spira, Maria Ubiali, Improved cross-section predictions for heavy charged Higgs boson production at the LHC. arXiv:1409.5615, Phys.Rev. D91 (2015) 7, 075015.
  • Interim recommendations for the evaluation of Higgs production cross sections and branching ratios at the LHC in the Two-Higgs-Doublet Model, LHCHXSWG-2013-001.

General documentation

A great deal of information can be found in the three CERN Reports: Handbook of LHC Higgs Cross Sections:

  1. Inclusive Observables ( CERN-2011-002, arXiv:1101.0593).
  2. Differential Distributions ( CERN-2012-002, arXiv:1201.3084).
  3. Higgs Properties ( CERN-2013-004, arXiv:1307.1347).

-- MarioPelliccioni - 16 Jul 2014

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Topic revision: r110 - 2019-10-18 - JanaSchaarschmidt
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