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COMETA workshop on EFT in HH and VBS

17–19 Mar 2025
Paris
Europe/Zurich timezone

Contribution List

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  1. 1. Workshop introduction
    17/03/2025, 14:00
  2. 2. VBS and HH theory review
    Alejo Nahuel Rossia (University of Padua and INFN Sezione di Padova)
    17/03/2025, 14:20
  3. 3. VBS experimental review
    Despoina Sampsonidou (University of Oregon (US)), Giacomo Boldrini (Centre National de la Recherche Scientifique (FR))
    17/03/2025, 14:50
  4. 4. HH experimental review
    Angela Taliercio (Northwestern University (US)), Laura Pereira Sanchez (SLAC National Accelerator Laboratory (US))
    17/03/2025, 15:20
  5. 5. Discussion
    17/03/2025, 16:30
  6. 18. A novel implementation of the Matrix Element Method at next-to-leading-order (NLO) for the measurement of the Higgs tri-linear coupling in di-Higgs production at the LHC (20+10)
    Matthias Jean Tartarin (Laboratoire des 2 Infinis - Toulouse, CNRS / Univ. Paul Sabatier (FR))
    17/03/2025, 17:00

    One of the LHC's priorities, following the discovery of the Higgs boson, is to observe the production of Higgs pairs and to measure the Higgs tri-linear coupling $\lambda_{3H}$.
    Due to the rarity of di-Higgs production, measuring $\lambda_{3H}$ has proven to be highly challenging. Exclusion limits have been observed using a variety of approaches, including cut-based methods and boosted...

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  7. 14. HEFT Multi-Higgs Production in VBF (20+10)
    Javier Martínez Martín (Universidad Complutense de Madrid & IPARCOS)
    17/03/2025, 17:30

    We have studied the production of 2, 3 and 4 Higgs bosons from the collision of Goldstone bosons using the equivalence theorem in HEFT. This work has been compared with results from both ATLAS and CMS. The measurements are being updated by the collaborations with the latest results.

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  8. 6. Review of VBS EFT MC modelling in ATLAS and CMS
    Costanza Carrivale (INFN - National Institute for Nuclear Physics), Costanza Carrivale (Universita e INFN, Perugia (IT)), Nicolas Morange (Université Paris-Saclay (FR))
    18/03/2025, 09:30
  9. 7. Review of HH EFT MC modelling in ATLAS and CMS
    Jona Motta (University of Zurich (CH)), Tom Ingebretsen Carlson (Stockholm University (SE))
    18/03/2025, 10:00
  10. 9. Pheno and theory overview : HH and VBS interplay, available tools
    Gudrun Heinrich (KIT)
    18/03/2025, 10:30
  11. 10. Discussion
    18/03/2025, 11:00
  12. 31. Group picture
    18/03/2025, 12:00
  13. 11. Publishing experimental results
    Adinda de Wit (LLR / CNRS (FR)), Ken Mimasu
    18/03/2025, 14:00
  14. 12. Discussion
    18/03/2025, 14:30
  15. 28. Electroweak WZ production measurement and an EFT interpretation with the ATLAS detector at 𝟏𝟑 𝑻𝒆𝑽 (20+10)
    Dr Eirini Kasimi (Aristotle University of Thessaloniki (GR))
    18/03/2025, 16:00

    Vector Boson Scattering in the WZ fully leptonic channel was studied in ATLAS with the full Run 2 data of 140 fb-1 and the results were published recently. The importance of the channel for the study of the Electroweak Symmetry Breaking and for indirect New Physics searches beyond the Standard Model will be presented. The results of the cross section measurements will be discussed and the...

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  16. 15. Double Higgs Production in Vector Boson Fusion at NLO QCD in HEFT
    Jens Braun (Karlsruhe Institute of Technology (KIT))
    18/03/2025, 16:30

    We present a calculation of the NLO QCD corrections to Higgs boson pair production in vector boson fusion, combined with the leading operators parametrising anomalous interactions in non-linear Effective Field Theory (HEFT). Based on our Monte Carlo implementation using GoSam+Whizard, we investigate the effects of anomalous Higgs couplings on various observables.

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  17. 29. Exploring multiple Higgs production at colliders with HEFT
    Daniel Domenech Moya (Universidad Autónoma de Madrid (ES)))
    18/03/2025, 17:00

    We have explored the effects of different HEFT coefficients to the multiple Higgs production via VBF at various colliders, studying their potential accessibility. We have also matched the bosonic HEFT to the 2HDM and the SMEFT in VBF processes.

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  18. 21. The Art of Counting: where to cut-off SMEFT and HEFT in Higgs Pair Production [REMOTE]
    Konstantin Schmid (University and INFN Padova)
    19/03/2025, 10:00
  19. 22. RGE effects in SMEFT predictions for HH production
    Stefano Di Noi (KIT (ITP))
    19/03/2025, 10:30
  20. 24. Probing Di-Higgs and Triple Higgs production in HEFT
    Anisha . (Karlsruhe Institute of Technology)
    19/03/2025, 11:00
  21. 26. VBS constraints on Higgs interactions in HEFT
    Domenec Espriu Climent (University of Barcelona (ES))
    19/03/2025, 11:30
  22. 23. HHH and HH production as probes of the Higgs self-couplings
    Panagiotis Stylianou
    19/03/2025, 14:30
  23. 25. SMEFT effects and CP violation in diboson production via gluon-fusion
    Marion Thomas
    19/03/2025, 15:00
  24. 27. Interplay between VBS and VBF-HH in constraining dimension-8 operators
    Paolo Torrielli (Universita e INFN Torino (IT))
    19/03/2025, 15:30
  25. 17. Double Higgs production via VBF NLO in SMEFT
    Michal Ryczkowski (Università di Padova and INFN, Sezione di Padova)
    19/03/2025, 16:00

    The process of double Higgs boson production via vector boson fusion (VBF), although strongly suppressed compared to the gluon fusion channel, remains an important area of study. Not only can it provide valuable insights into the EW sector and the mechanism of EWSB, but it is also highly sensitive to BSM physics. In this talk, we explore the impact of dimension-6 and dimension-8 SMEFT...

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  26. 20. First look at dim-8 EFT operators in VBF hh->HH
    Thiziri Amezza (Centre National de la Recherche Scientifique (FR))

    This study aims to probe the boosted Higgs boson pair production (HH) via Vector Boson Fusion process (VBF) which has unique sensitivity for the so far unmeasured quartic Higgs-gauge coupling (HHVV) at leading order. To explore this, we are investigating the dimension-8 Effective Field Theory (EFT) operators within the VBF HH framework, using the extended aqgc model. This model builds upon the...

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  27. 8. ML for reweighting
  28. 30. Sensitivity study of VBS process to dimention-8 EFT operators
    Sijing Zhang (L2IT/Université de Toulouse, CNRS/IN2P3 (FR))

    The new dimention-8 EFT model for the quartic couplings in HEFT has been enclosed recently. This model contains the 5 effective operators that appear at order p^4 (NLO in HEFT), which has been demonstrated to have contribution to the VBS processes. The first sensitivity study of this model for the VBS processes at ATLAS will be shown in this talk.

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  29. 16. The effect of single Higgs backgrounds and Higgs branching fractions in the SMEFT interpretation
    Dr Ligang Xia (Nanjing University (CN))

    Some SMEFT parameters contribute to both di-Higgs and single-Higgs productions. Taking the HH->bbyy channel (JHEP 01(2024) 066) as example, we present the results on the effects of single Higgs backgrounds and Higgs branching fractions and discuss about the evaluation of systematical uncertainties.

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  30. 19. VBS aQGC Reweighting study
    Olivier Salin (Université Paris-Saclay)

    This talk will present an investigation into generating EFT aQGC samples using the internal Madgraph LO matrix element reweighting method. The study focuses on the semi-leptonic VBS process applied to the new aQGC recommendation superset of the Eboli model. The aim is to assess the accuracy and reliability of the approach and, if possible, validate it as an alternative to the EFT decomposition...

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  31. 13. VBS measurement in semileptonic final states with ATLAS Run-2 data (20+10)
    Mathieu Markovitch (Université Paris-Saclay (FR))

    Vector boson scattering (VBS) processes probe the fundamental structure of electroweak (EW) interactions and provide a high sensitivity to new physics phenomena affecting gauge and Higgs couplings. The semileptonic final states, where one of the scattered electroweak boson decays hadronically into a quark/antiquark pair and the other boson decays leptonically into electrons, muons or...

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