HHH workshop

Contribution List

28. Welcome talk + logistics

Vuko Brigljevic (Rudjer Boskovic Institute (HR))

29/09/2025, 09:00

Opening session: experiment and theory overview

25. Theory overview

Tania Robens (Rudjer Boskovic Institute (HR))

29/09/2025, 09:15

Opening session: experiment and theory overview

Opening session: experiment and theory overview

30'+15'

10. Experimental overview: HHH and HH results since the 2023 HHH workshop

Tristan Arnoldus Du Pree (Nikhef National institute for subatomic physics (NL))

29/09/2025, 10:00

Opening session: experiment and theory overview

Opening session: experiment and theory overview

30' + 15'

27. CMS road to HH

Jacobo Konigsberg (University of Florida (US))

29/09/2025, 11:15

Experimental session

Experiment session

7. Recent ATLAS HH results

Brian Moser (University of Freiburg (DE))

29/09/2025, 11:45

Experimental session

Experiment session

15. CMS: small and large-radius jets tagging in searches for rare processes

Loukas Gouskos (Brown University (US))

29/09/2025, 12:15

Experimental session

Experiment session

20'+10'

18. ATLAS HHH6b

Osama Karkout (Nikhef National institute for subatomic physics (NL))

29/09/2025, 14:00

Experimental session

Experiment session

20'+10'

8. Recent CMS HHH results

Marko Stamenkovic (Brown University (US)), Xinyue Geng (Peking University (CN))

29/09/2025, 14:30

Experimental session

Experiment session

20'+10'

12. Ideas for HHH4b2tau

Gabriel Oliveira Correa (The Barcelona Institute of Science and Technology (BIST) (ES))

29/09/2025, 15:00

Experimental session

Experiment session

13. CMS tau-identification in the context of HHH4b2tau

Dennis Roy (Kansas State University (US))

29/09/2025, 15:30

Experimental session

Experiment session

19. An analytic result for the 0 → g g H H H 0→ggHHH amplitude

Giuseppe De Laurentis (University of Edinburgh)

29/09/2025, 16:30

Theory session

Theory session

We present a fully analytic calculation of the leading-order one-loop amplitude for triple Higgs production via gluon fusion, gg to HHH, retaining full dependence on the mass of the heavy quark circulating in the loop. This amplitude provides a direct probe of the triple and quartic Higgs self-couplings, the measurement of which is a central goal of current and future colliders. The amplitude...

5. Reinterpreting the ATLAS HHH search in CheckMATE and Rivet

Krzysztof Rolbiecki (Warsaw University)

29/09/2025, 17:00

Experimental session

Theory session

We present early results from the reinterpretation of the ATLAS HHH search in CheckMATE and Rivet, including extensive validation material, and demonstrate how this can be used to place limits on a wider range of models than those studied by ATLAS.

4. Multi-Higgs production as probes of HEFT interactions

Anisha . (Karlsruhe Institute of Technology)

29/09/2025, 17:30

Theory session

Theory session

Using the framework of the Higgs Effective Field Theory (HEFT), I will discuss multi-Higgs production via gluon-gluon fusion (ggF) and weak boson fusion (WBF). For ggF-induced multi-Higgs production, I will highlight the impact of one-loop HEFT modifications on the Higgs self-couplings and study their effects on the production rates. By including these one-loop radiative corrections and going...

22. Electroweak Symmetry Restoration at High Energies

Tao Han

29/09/2025, 18:00

Theory session

Theory session

With the milestone discovery of the Higgs boson at the LHC, detailed study of its properties becomes a high priority for collider physics. After a brief overview of the properties of the longitudinal gauge bosons and the Higgs boson, we revisit the Goldstone boson equivalence theorem and define the “electroweak symmetry restoration” (EWSR) quantitatively. We present some examples to examine...

9. ATLAS Xbb tagging

Jurjan Bootsma (Nikhef National institute for subatomic physics (NL))

30/09/2025, 09:00

Experimental session

Experiment session

14. ATLAS b-jet trigger

Roshan Joshi (Ohio State University (US))

30/09/2025, 09:30

Experimental session

Experiment session

17. CMS: recent developments in heavy flavor tagging

Clara Ramon Alvarez (University of Virginia (US))

30/09/2025, 10:00

Experimental session

Experiment session

26. Open discussion for HHH YR5 contributions

Benjamin Fuks, Greg Landsberg (Brown University (US)), William Balunas (University of Cambridge (GB))

30/09/2025, 10:30

Experiment session

30. A new probe of the quartic Higgs self-coupling

Giulia Zanderighi (Max Planck Society (DE))

30/09/2025, 11:30

Theory session

21. Connecting Multi-Higgs production and the Electroweak Phase Transition

Osama Karkout (Nikhef National institute for subatomic physics (NL))

01/10/2025, 09:00

Theory session

Theory session

Exploring the Higgs sector via multi-Higgs production searches is a main goal for run-3 and high-lumi LHC. Can these searches inform us about the electroweak phase transition and matter-antimatter asymmetry? We address this question in the context of the TRSM (Two-Real-Singlet Model), which has known benchmark points enhancing multi-Higgs production. We update the triple-Higgs production...

23. Triple Higgs production in a 100 TeV collider

Gilberto Tetlalmatzi-Xolocotzi (Siegen University)

01/10/2025, 09:30

Theory session

Theory session

In this talk we will discuss the feasibility of detecting triple Higgs production at a 100 TeV proton-proton collider. The final state considered will be that where each Higgs decays into a bottom-anti bottom pair. The study will be done within the SM as well as considering anomalous couplings which can be induced by New Physical effects.

29. TRSM Light Scalars in the Spotlight of the LHC

Mohamed Ouchemhou

01/10/2025, 10:00

Theory session

20. Deciphering the CP nature of the 95 GeV Higgs boson

Prasenjit Sanyal (Asia Pacific Center for Theoretical Physics), Prasenjit Sanyal (Asia Pacific Center for Theoretical Physics)

01/10/2025, 10:30

Theory session

Theory session

The excesses observed by CMS in the ττ and γγ channels around 95 GeV, together with the bbbar excess reported by the LEP collaboration in the same mass region, have sparked significant interest in the possibility of new physics beyond the Standard Model (BSM). Several BSM frameworks featuring a non-standard Higgs-like state lighter than 125 GeV have been proposed to explain the anomalies...

24. Detecting P-even CP violation at future colliders in the production of multiple Higgs bosons of extended Higgs sectors

Howard Haber (University of California,Santa Cruz (US))

01/10/2025, 11:30

Theory session

Theory session

New sources of neutral scalar-mediated CP violation that arise in extended Higgs sectors can originate in the Yukawa sector or in the structure of the scalar potential. Most treatments in the literature focus on CP-violating Yukawa interactions of neutral scalars, which is an example of P-odd CP violation since it derives from the mixing of two C-even operators of opposite sign P. In contrast,...

11. HHH 2025 workshop: closing session and vision for the future

Prof. Todd Brian Huffman (University of Oxford (GB))

01/10/2025, 12:00

Closing session: overview and vision for the future

Closing session: overview and vision for the future

30'+15'

3. Monte Carlo Simulation for the LHC Experiments at CERN: A Comprehensive Overview

Marija Rapseviciute (Vilnius University (LT))

Theory session

Experiment session

This overview of the Monte Carlo (MC) simulation process at the four main experiments - ATLAS, CMS, ALICE, and LHCb - at the Large Hadron Collider (LHC) is provided in this talk. Given the complexity and noise of proton-proton collisions, simulated samples are essential for understanding and interpreting the experimental results, enabling precise measurements and searches for new physics. The...