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Higgs Hunting 2025

Europe/Paris
200/0-Auditorium - Auditorium P. Lehmann (IJCLab)

200/0-Auditorium - Auditorium P. Lehmann

IJCLab

IJCLab Orsay (Tuesday) & APC Paris (Wednesday & Thursday)
250
Montrer la salle sur la carte
Description

Conferecne poster HDThe origin of Electroweak symmetry breaking is one of the central topics of research in fundamental physics. The discovery of a Higgs boson at CERN on July 4th, 2012, following a hunt that spanned several decades and multiple colliders, changed the landscape of these investigations and provided key evidence for the Brout-Englert-Higgs mechanism of mass generation through the spontaneous breaking of Electroweak symmetry.

More than ten years later, the hunt goes on several fronts, in particular for:

  • New physics through precision studies of the properties of the Higgs boson : in particular its mass, spin and couplings to other Standard Model particles.
  • New production and decay modes, in particular in processes involving multiple Higgs bosons which provide key insight into the shape of the Higgs potential.
  • New Higgs-like states and signals for physics beyond the Standard Model.

The 15th workshop of the « Higgs Hunting » series organized on July 15-17 2025 will present an overview of these topics, focusing in particular on new developments in the LHC Run-2 analyses, detailed studies of Higgs boson properties and possible deviations from Standard Model predictions. Highlights will also include a first look at LHC Run-3 analyses, prospects from studies at future colliders, and recent theoretical developments.

The workshop will be held in person in Orsay, for the first day, and Paris, for the two following days, to continue the Higgs Hunting tradition of lively discussions during and after the sessions. Remote participation will also be made possible for those unable to attend in person. No registration fees are asked for remote participation.

HH2025 tutelles Labos

HTDS

 

Registration deadline: June 23, 2025

 

 

Valérie Brouillard et Emilie Bonnardel
Inscription
Registration
Participants
    • 09:00
      Registration (with coffee and croissants) 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

      IJCLab Orsay (Tuesday) & APC Paris (Wednesday & Thursday)
      250
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    • Plenary: Theory overview 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

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      • 1
        Theory overview
        Orateur: Thomas Gehrmann (Universität Zurich)
    • Plenary: Higgs boson properties and couplings 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

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      • 2
        Higgs boson property measurements (mass, width, CP) - CMS
        Orateur: Amrutha Krishna (Northeastern University)
      • 3
        Higgs boson property measurements (mass, width, CP) - ATLAS
        Orateur: Elise Le Boulicaut (Yale University)
      • 4
        Higgs boson coupling measurements - CMS
        Orateur: Walaa Elmetenawee (Universita e INFN, Bari)
      • 5
        Higgs boson coupling measurements - ATLAS
        Orateur: Fábio Lucio Alves (Nanjing University)
      • 6
        Higgs boson properties and couplings - 3-slide overview
      • 7
        Discussion of present status and prospects for coupling and property measurements
    • 12:30
      Lunch Bures cafeteria (Orsay)

      Bures cafeteria

      Orsay

    • Topical talks: Part 1 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

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      • 8
        Measurements of the Higgs boson mass and width in CMS
        Orateur: Neha Rawal (University of Florida)
        Abstract Ever since the discovery of the Higgs boson by the ATLAS and CMS Collaborations at LHC in 2012, precision measurements of its properties have been performed intensively. This is crucial for further understanding the Standard Model (SM) as well as to search for beyond the SM physics. This presentation focuses on precision measurements of the Higgs boson mass and total decay width performed using proton-proton collision data collected by the CMS detector during Run 2 of the LHC. It includes analysis strategies and techniques for precise and accurate measurement of the mass and discusses direct measurement of the width from the Higgs resonance peak. We also highlight studies on indirect width measurements which provide a better constraint on its value compared to direct measurements which are limited by the detector resolution.
      • 9
        Constraining the Higgs boson width from Higgs-top Yukawa coupling at the ATLAS experiment
        Orateur: Yangfan Zhang (University of Science and Technology of China)
      • 10
        First VBF H(cc) measurement at the ATLAS experiment
        Orateur: Greta Brianti (Università di Trento)
      • 11
        Search for H→cc at the CMS experiment
        Orateur: Angela Zaza (Univ. di Bari e Sez. dell'INFN)
        Abstract Probing the Higgs boson coupling to second generation quarks, still out of reach, is currently one of the most challenging goals of the CMS and ATLAS collaborations. The CMS collaboration carried out searches for the Higgs boson decay in a charm quark-antiquark pair with data collected during the Run-2 of the LHC (2016-2018), by exploring the Higgs boson associated production with a vector boson (VH) , the gluon fusion (ggF) and the associated production with a top quark-antiquark pair (ttH) production mechanisms. By combining the ttH and VH production mechanisms, CMS set the most stringent constraint to date on the Hcc Yukawa coupling modifier: |kc| < 3.5 (2.7). An overview on the searches for H→cc carried out by the CMS collaboration will be presented in this contribution.
    • Plenary: The Higgs boson self-coupling and the electroweak phase transition 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

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    • Plenary: Higgs boson self-coupling and Di-Higgs production 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

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      • 12
        Higgs boson self-coupling and Di-Higgs production - ATLAS
        Orateur: Lorenzo Santi (CERN)
      • 13
        Higgs boson self-coupling and Di-Higgs production - CMS
        Orateur: Leonidas Paizanos (University of Cyprus)
      • 14
        Higgs boson self-coupling and Di-Higgs production: 3-slide overview
      • 15
        Discussion of Higgs boson self-coupling and Di-Higgs production
    • 16:30
      Coffee break 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

      IJCLab Orsay (Tuesday) & APC Paris (Wednesday & Thursday)
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    • Plenary: Parton distribution functions Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      • 16
        PDFs for Higgs boson processes at the LHC
        Orateur: Juan Rojo (Vrije Universiteit Amsterdam)
    • Topical talks: Part 2 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

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      • 17
        Model-independent differential measurement in H→WW at the CMS experiment
        Orateur: Benedetta Camaiani (Univ. di Firenze e Sez. dell'INFN)
        Abstract We present the differential measurement of H+jets in the WW decay channel using full run 2 CMS data. The measurements presented probe the CP nature of the Higgs boson couplings. A novel approach was used, exploiting adversarial neural network, to minimize model dependency of the measurement and allow reinterpretability. Constraints on several Wilson coefficients are also derived.
      • 18
        Naturalness, near-criticality and future colliders
        Orateur: Victor Enguita-Vileta (IFT Madrid)
      • 19
        An Isotropic Prescription for Constructing the SMEFT in Normal Coordinates to Simplify Amplitude Computations
        Orateur: Mia West (University of Florida)

        Geometry provides us with a convenient interpretation of field-redefinition invariance for amplitudes and has many useful properties. For instance, it directs us towards Riemann Normal Coordinates (RNC) as an ideal choice of field-redefinition to compute amplitudes. It has been shown in the Higgs Effective Field Theory (EFT) assuming custodial symmetry & in the high-energy limit in RNC there are distinct kinematics for each Feynman graph. Redefining the Lagrangian in these coordinates appears to generate a reduced set of Feynman graphs which still sum to the correct amplitude. This property also holds in the Standard Model EFT (SMEFT) as a subset of HEFT. In this talk, we will demonstrate a prescription to construct the SMEFT in RNC around the symmetric point using isotropy, applicable to all orders in the SMEFT expansion. Then, breaking electroweak symmetry corresponds to traversing a geodesic to the vacuum and re-establishing RNC in terms of isotropic properties of the symmetric point. We argue that this prescription is simpler compared to the usual recursive method to construct RNC.

    • Historical talk 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

      IJCLab Orsay (Tuesday) & APC Paris (Wednesday & Thursday)
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      • 20
        Mysterious Neutrinos
        Orateur: Pierre Ramond (University of Florida)
    • 19:00
      Welcome cocktail 200/0-Auditorium - Auditorium P. Lehmann

      200/0-Auditorium - Auditorium P. Lehmann

      IJCLab

      IJCLab Orsay (Tuesday) & APC Paris (Wednesday & Thursday)
      250
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    • 09:25
      Coffee LPNHE Paris

      LPNHE Paris

    • Plenary: CMS Joker talk Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Sven Heinemeyer (IFT/IFCA (CSIC))
      • 21
        CMS Joker talk
    • Plenary: BSM H(125) aspects and searches for new scalar bosons Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Sven Heinemeyer (IFT/IFCA (CSIC))
      • 22
        BSM H(125) aspects and searches for new scalar bosons - CMS
        Orateur: Siddhesh Gopichand Sawant (Baylor University)
      • 23
        BSM H(125) aspects and searches for new scalar bosons - ATLAS
        Orateur: Eleni Skorda (University of Birmingham)
      • 24
        BSM H(125) aspects and searches for new scalar bosons: 3-slide overview
      • 25
        Discussion of BSM H(125) aspects and searches for new scalar bosons
    • 12:10
      Lunch buffet LPNHE Paris

      LPNHE Paris

    • Plenary: Analysis methods Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      • 26
        Analysis methods - CMS
        Orateur: Maria Mazza (Florida State University)
      • 27
        Analysis methods - ATLAS
        Orateur: Andrea Sciandra (Brookhaven National Laboratory)
      • 28
        Discussion of analysis methods
    • Topical talks: Part 3 Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      • 29
        TBA
        Orateur: Wanda Isnard (IP2I Lyon)
      • 30
        Search for Higgs boson decays into a pair of pseudoscalar particles in the yytautau final state using pp collisions at \sqrt{s} = 13 TeV with the ATLAS detector
        Orateur: Gadi Ninio (Tel Aviv University)
      • 31
        Search for CP violating effects in HWW vertex in WH production channel in 13 TeV pp collisions with the ATLAS detector
        Orateur: Ricardo Barrue (LIP Lisboa)
      • 32
        Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions with CMS at √s=13 and 13.6 TeV
        Orateur: Benjamin Massoteau (IPN, IN2P3-CNRS, UCB Lyon 1)
        Abstract The results of a search for a standard model-like Higgs boson decaying into two photons in the mass range between 70 and 110 GeV are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions from Run 2 at √s=13 TeV and part of the data set from Run 3, at √s=13.6 TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction for decays of an additional Higgs boson into two photons are presented.
    • Plenary: VBS Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      • 33
        Vector boson scattering and the Higgs boson
        Orateur: Mathieu Pellen (Universität Freiburg)
    • 15:30
      Coffee break LPNHE Paris

      LPNHE Paris

    • Plenary: Effective field theories Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Pamela Ferrari (Radboud University Nijmegen & Nikhef)
      • 34
        Effective field theories - theory overview
        Orateur: José Santiago (University of Granada)
      • 35
        Effective field theories - ATLAS
        Orateur: Elena Mazzeo (CERN)
      • 36
        Effective field theories - CMS
        Orateur: Suman Chatterjee (DESY)
      • 37
        Effective field theories: 3-slide overview
      • 38
        Discussion of EFT interpretations
    • Topical talks: Part 4 Amphithéâtre Charpak (APC Paris)

      Amphithéâtre Charpak

      APC Paris

      Président de session: Pamela Ferrari (Radboud University Nijmegen & Nikhef)
      • 39
        Bootstrapping the EFTs
        Orateur: Ziyu Dong (IFAE Barcelona)
      • 40
        Deconstructing the Composite Higgs
        Orateur: Marko Pesut (Universität Zürich)

        Abstract: In the first part of the talk, we will introduce the main model building ideas (flavour non-universality and Higgs compositeness) that are central to our model, as well as the theoretical and experimental motivations for exploring these BSM avenues. In the second part of the talk, we present a flavour non-universal extension of the Standard Model combined with the idea of Higgs compositeness. At the TeV scale, the electroweak gauge symmetry is assumed to act in a non-universal manner on light- and third-generation fermions, while the Higgs emerges as a pseudo Nambu-Goldstone boson of a spontaneously broken global symmetry. The flavour deconstruction implies that the couplings of the light families to the composite sector are suppressed by powers of a heavy mass scale, explaining the flavour puzzle. We present a detailed analysis of the radiatively generated Higgs potential, showing how this intrinsically-flavoured framework has the ingredients to justify the unavoidable tuning in the Higgs potential necessary to separate electroweak and composite scales. The model is compatible with current experimental bounds and predicts new states at the TeV scale, which are within the reach of near future experimental searches.
        Arxiv: 2407.10950

      • 41
        The Higgs meets the SMEFT at higher orders
        Orateur: Stefano Di Noi (Karlsruhe Institute of Technology)
    • Plenary: Vision talk Amphithéâtre Charpak (LPNHE PAaris)

      Amphithéâtre Charpak

      LPNHE PAaris

      Président de session: Pamela Ferrari (Radboud University Nijmegen & Nikhef)
      • 42
        Vision talk: Higgs physics and Early Universe cosmology
        Orateur: Alfredo Urbano (University of Rome La Sapienza)
    • 19:00
      Dinner "Capitaine Fracasse" river barge

      "Capitaine Fracasse" river barge

      Departure from "Ile aux cygnes" (RER station "Champ de Mars Tour Eiffel", métro station "Bir-Hakeim")
      Boarding at 20:15, departure at 20:45, return at 23:00

    • 09:30
      Coffee LPNHE Paris

      LPNHE Paris

    • Plenary: ATLAS Joker talk Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      • 43
        ATLAS Joker talk
    • Plenary: Higgs physics within the European strategy update Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Karl Jakobs (University of Freiburg)
      • 44
        Theory overview
      • 45
        Accelerators overview
        Orateur: Frank Zimmermann (CERN)
      • 46
        Overview of the ESPPU strategy for Higgs and Electroweak physics and introduction to the discussion
        Orateur: Gregorio BERNARDI (APC-Paris CNRS/IN2P3)
      • 47
        Discussion
    • 12:45
      Lunch buffet LPNHE Paris

      LPNHE Paris

    • Plenary: Toponium Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Florencia Canelli (Universität Zürich)
      • 48
        Toponium formation at the Large Hadron Collider
        Orateur: Benjamin Fuks (LPTHE Paris)
    • Topical talks: Part 5 Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Florencia Canelli (Universität Zürich)
    • Plenary: Concluding talks Amphithéâtre Charpak (LPNHE Paris)

      Amphithéâtre Charpak

      LPNHE Paris

      Président de session: Florencia Canelli (Universität Zürich)
      • 49
        Theory concluding talk
        Orateur: Gavin Salam (University of Oxford)
      • 50
        Experimental concluding talk
        Orateur: Maria Cepeda (CIEMAT)
    • 16:50
      Farewell coffee LPNHE Paris

      LPNHE Paris