HHH workshop

Contribution List

32. Welcome talk + logistics

Vuko Brigljevic (Rudjer Boskovic Institute (HR))

14/07/2023, 10:15

15. Introduction to HHH: SM and BSM phenomenology

Benjamin Fuks

14/07/2023, 10:30

Morning session

34. QCD overview

Giulia Zanderighi (Max Planck Society (DE))

14/07/2023, 11:00

Morning session

16. Overview of HH experimental results from CMS

Marko Stamenkovic (Brown University (US))

14/07/2023, 11:30

Morning session

Lessons learned from HH: from analyses strategy to background modelling

35. Experimental perspectives on HHH production

William Balunas (University of Cambridge (GB))

14/07/2023, 12:00

Morning session

There has recently been increased theoretical interest in tri-Higgs production, but no experimental search or measurement has yet been performed. Several significant challenges would be faced, including signal identification and discrimination against background, modelling of complex background processes, and interpretation of the data. This talk will present an experimentalist's view of...

12. Reconstruction of boosted and resolved multi-Higgs-boson final states with symmetry-preserving attention

Haoyang Li (Univ. of California San Diego (US)), Marko Stamenkovic (Brown University (US))

14/07/2023, 14:00

Afternoon session

The production of multiple Higgs bosons at the CERN LHC provides a direct way to measure the trilinear and quartic Higgs self-interaction strengths as well as potential access to beyond the standard model effects that can enhance production at large transverse momentum 𝑝T. The largest event fraction arises from the fully hadronic final state in which every Higgs boson decays to a bottom...

17. Complementing constraints of the Higgs potential shape with triple-Higgs searches at the LHC

Brian Moser (CERN), Hannah Arnold (Nikhef), Marko Stamenkovic (Brown University (US))

14/07/2023, 14:30

Afternoon session

The discovery of the Higgs boson in 2012 was a triumph for the Standard Model (SM) of particle physics and the mechanism of electroweak symmetry breaking. An essential ingredient to this mechanism is the Higgs field potential, which is introduced ad-hoc and assumed to be Mexican-hat shaped in the SM, but cannot be derived from first principles. It is therefore important to probe this shape...

13. Improving Multi-Higgs sensitivity in the hadronic final state using machine learning

Daniel Diaz (Univ. of California San Diego (US)), Javier Mauricio Duarte (Univ. of California San Diego (US)), Sanmay Ganguly (University of Tokyo (JP))

14/07/2023, 15:00

Afternoon session

One of the central goals of the physics program at the future colliders is to elucidate the origin of electroweak symmetry breaking, including precision measurements of the Higgs sector. This includes a detailed study of Higgs boson pair production, which can reveal the Higgs self-interaction strength through the gluon fusion mode as well as the coupling between Higgs and vector bosons through...

14. HHH, the Higgs potential and electroweak baryogenesis

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

14/07/2023, 15:30

Afternoon session

The search for the HHH process at the LHC targets both the quartic and trilinear Higgs self-couplings, and thereby provides important information about the shape of the Higgs potential. Indirectly, it could also give insight in the matter-antimatter asymmetry observed in the universe. This presentation discusses the relation of the HHH process with the mechanism of electroweak symmetry...

18. Open discussion - experimentalists and theorists requests exchange

14/07/2023, 16:30

Townhall discussion based on feedback received by participants - organised through slides

What are experimentalists requests to theorists?

What are theorists requests to experimentalists?

19. General ATLAS flavour tagging

Bingxuan Liu (Simon Fraser University (CA))

15/07/2023, 09:30

Morning session

An introduction to the ATLAS Flavour Tagging, which covers the new Run 3 tagger development. In addition to the tagger itself, we will also cover the calibration programs and other statistical treatments.

20. ATLAS b-jet trigger

Maggie Chen (University of Oxford (GB))

15/07/2023, 10:00

Morning session

Several new b-jet triggering strategies have been deployed for ATLAS Run 3. We will show the preliminary performance plots and discuss its impact on the Run 3 HHH program. In particular, we will initialize a discussion on what new triggers should be implemented for the rest of Run 3 and HL-LHC, in order to probe the full phase space.

21. Boosted flavour tagging algorithms in ATLAS

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

15/07/2023, 10:30

Morning session

There has been quite some advancements in the area of boosted flavour tagging in ATLAS. We will discuss the baseline tagger performance and in particular a dedicated low mass a->bb tagger.

22. CMS heavy flavour tagging: novel HH and HHH trigger strategy for Run 3

Marina Kolosova (University of Florida (US))

15/07/2023, 11:30

Morning session

Recent progress in heavy flavour tagging as well as boosted flavour tagging has enabled the CMS experiment to probe rare Higgs processes with more sensitivity than ever. In this talk, we will discuss the novel HH and HHH trigger strategy deployed for Run 3.

23. Dissecting multi-Higgs production in new physics models

Dr Andreas Papaefstathiou (Kennesaw State University, GA, USA)

15/07/2023, 12:00

Morning session

In this talk I will explore the behaviour of multi-Higgs boson production, with a focus on triple Higgs boson production, in the context of various new physics models. I will discuss theories that incorporate higher-dimensional operators, and models with one or two additional singlet scalar fields.

24. Phenomenology of flavoured 3HDMs

Roman Pasechnik (Lund university)

15/07/2023, 14:00

Afternoon session

I will overview our recent advances in studies of various phenomenological implications of multi-Higgs extensions of the Standard Model constrained by additional symmetries. A particular focus would be
on 3HDMs, with some of their basic implications on Higgs and flavour physics.

26. Investigating the trilinear Higgs coupling through triple Higgs production

Panagiotis Stylianou

15/07/2023, 14:30

Afternoon session

Triple Higgs production is of interest because it involves the quartic Higgs coupling 𝜅4, which however will be very difficult to constrain experimentally during the next decades, but also because of its significant dependence on the trilinear Higgs coupling 𝜅3. The latter dependence could be used to improve the experimental sensitivity on 𝜅3 in combination with the experimental information...

36. HHH - (a few) experimental thoughts

Greg Landsberg (Brown University (US))

15/07/2023, 15:00

Afternoon session

28. Open discussion - experimentalists and theorists requests exchange [part 2] or break-out rooms discussions

15/07/2023, 16:00

Open session to continue the discussion between experimentalists and theorists

Additional possibility for break-out rooms in smaller group if needed

33. Overview on BSM scenarios with enhancements in HH and HHH

Tania Natalie Robens (Rudjer Boskovic Institute (HR))

16/07/2023, 10:30

Closing session

I will give a short overview on models with extended scalar sectors that allow for triple scalar final states, including most recent theoretical and experimental constraints.

29. Scrutinising the Higgs quartic coupling at a future 100 TeV proton-proton collider

Benjamin Fuks

16/07/2023, 11:00

Closing session

The Higgs potential consists of an unexplored territory in which the electroweak symmetry breaking is triggered, and it is moreover directly related to the nature of the electroweak phase transition. Measuring the Higgs boson cubic and quartic couplings, or getting equivalently information on the exact shape of the Higgs potential, is therefore an essential task. We discuss options for related...

30. Triple Higgs boson production at a 100 TeV proton-proton collider

Kazuki Sakurai (University of Warsaw)

16/07/2023, 11:30

Closing session

We consider triple Higgs boson production at a future 100 TeV proton-proton collider.
We perform a survey of viable final states and compare and contrast triple production to Higgs boson pair production.
Focussing on the hhh -> (bb)(bb)(gamma,gamma) final state we construct a baseline analysis for the Standard Model scenario and simple deformations demonstrating that the process merits...

31. Highlights of HHH workshop

Jacobo Konigsberg (University of Florida (US))

16/07/2023, 12:00

Closing session

27. Coffee break

11. HHH prospects

Pim Bijl (Nikhef and UvA), Tristan Arnoldus Du Pree (Nikhef National institute for subatomic physics (NL))

In this talk I will explore the behaviour of multi-Higgs boson production, with a focus on triple Higgs boson production, in the context of various new physics models. I will discuss theories that incorporate higher-dimensional operators, and models with one or two additional singlet scalar fields.

25. Triple-Higgs production at LHC and future hadron colliders

Zhijie Zhao

Afternoon session

After the discovery of Higgs boson, Standard Model (SM) has been test successfully. However, experimental data suggests that new physics (NP) beyond SM should exist. Measurements of Higgs properties and couplings are essential to search for NP. Multi-Higgs production processes at colliders are important to reconstruct the Higgs potential and to study the mechanism of electroweak symmetry...