Off-shell Interpretations Task Force

If you would like to join, please let us know.

Task force e-group: lhc-higgs-offshell-interpretations
You may sign up here (search for "lhc-higgs-offshell-interpretations")
email address:

General information: intro_slides.pdf

Write-up: GitLab

Clarifications for general information:

  • Covid-19-related measures imply that the original deadline is not realistic. The new deadline for the complete first version of the documentation is the end of June 2021.
  • Our publication approach is in full agreement with LHCHXSWG policy. We plan to evolve from TWiki content to a write-up that can be classified depending on its quality as Internal Note (no submission to arXiv) or, with the appropriate additional steps (e.g. WG feedback and SC approval), as Public Note with arXiv submission.

General Meetings

9 November 2020 Indico link

Joint Meetings

23 September 2020 Indico link
8 July 2020 Indico link
16 April 2020 Indico link
10 March 2020 Indico link

Discussion Points

  • Which models/EFTs should be investigated with what priority? (subgroup 1)
    • Theory feedback on (EFT) models used in experimental analyses
    • Update Theory status in light of experimental progress (slightly outdated papers)
    • Adam, Alex, Andrei, Ashley, Christophe, Dermot, Eleni, Ennio, Jorge, Nicolas P., Nikolas K., Pascal, Rafael, Ulascan, Li Yuan (cc: WG2 conveners)
    • TWiki page: HiggsOffshellInterpretationsModels
    • Write-up: GitLab
    • e-group: lhc-higgs-offshell-interpretations-models
  • global EFT fits compatibility: tools to convert results and for validation
    • aim for compatibility and consistency early on; would be helpful to highlight issues with a concrete example
    • discuss in subgroup 1
  • Event generators/programs comparison, recommended prescriptions, are they available in the experimental tool chains? (subgroup 2)
  • Jet-binning and associated uncertainties (Theory, others)
  • Theory uncertainty treatment for non-interfering background channels (subgroup 3)
  • BSM higher order effects in EFT
    • studied for tree-level processes w/ MadGraph, loop-level: only gg → H on-shell (125 GeV); EFT K-factor similar to SM K-factor; going beyond is complicated
    • revisit later

Precision Discussion (separately):

  • Higher order QCD K factors for gg → VV (S, B, I)
  • Higher order QCD K factors for VBF/VH → VV (S, B, I)
  • Theory uncertainty treatment for non-interfering background channels
    (full NLO QCD+EW corrections to the non-interfering VV background: how to take into account/tools/uncertainty; methods to reduce uncertainty due to EW corrections)
    • correlation between uncertainty of different non-interfering backgrounds?; conservative uncertainty assumptions being used by experiments
    • MATRIX: arXiv:1912.00068
    • desirable: uncertainty prescription supported by theorists
  • Theory uncertainty treatment for interfering contributions/channels
  • Top quark mass effects on the signal and continuum
  • Jet-binning and associated uncertainties (Theory, others)
  • BSM higher order effects in EFT

Task Force Members


Lailin Xu (Brookhaven BNL)

ZZ: Rafael Coelho Lopes De Sa (UMass Amherst), Martina Javurkova (UMass Amherst), Jay Sandesara (UMass Amherst), Ashley Mcdougall (NIKHEF Amsterdam)

WW: Spyros Argyropoulos (U. Freiburg)


Ulascan Sarica (UC Santa Barbara)

ZZ → 2l2nu: Pascal Vanlaer (UL Bruxelles), Li Yuan (BUAA Beijing), Andrey Popov (UL Bruxelles), Sicheng Wang (UC Santa Barbara), Nicolas Postiau (UL Bruxelles), Mostafa Mahdavikhorrami (UL Bruxelles), Hanwen Wang (BUAA Beijing & UL Bruxelles) Jerry Ling (UC Santa Barbara, until August)

ZZ → 4l: Andrei Gritsan (JHU Baltimore), Savvas Kyriacou (JHU Baltimore)

WW: Xavier Janssen (U. Antwerp), Dermot Moran (CIEMAT Madrid)


Aleksandr Azatov (SISSA), Jorge de Blas Mateo (IPPP Durham), Adam Falkowski (LPT Orsay), Christophe Grojean (DESY & Humboldt U.), Nikolas Kauer (U. of London), Raoul Röntsch (CERN), Ennio Salvioni (CERN), Eleni Vryonidou (CERN)

Related Working Groups

Edit | Attach | Watch | Print version | History: r60 < r59 < r58 < r57 < r56 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r60 - 2021-03-05 - NikolasKauer
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    LHCPhysics All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback