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The 22nd Workshop of the LHC Higgs Working Group

→ Europe/Zurich
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber

CERN

162
Show room on map
Eleni Vryonidou (University of Cyprus (CY)), Emanuele Di Marco (INFN, Roma 1 (IT)), Ennio Salvioni (University of Sussex (GB)), Fabrizio Arturo Caola (University of Oxford (GB)), Gaetano Barone (Brown University), Julie Malcles (IRFU-CEA, Université Paris-Saclay (FR)), Liza Brost (Brookhaven National Laboratory (US)), Nicolas Berger (Centre National de la Recherche Scientifique (FR)), Ramona Groeber (Università di Padova and INFN, Sezione di Padova)
Description

The aim of the LHC Higgs Working Group (LHCHWG) is to collect and produce theoretical predictions relevant for Higgs physics in the Standard Model and beyond. Summaries of these activities have been made available in four CERN Reports: "Inclusive Observables" (CERN-2011-002), "Differential Distributions" (CERN-2012-002),  "Higgs Properties" (CERN-2013-004) and "Deciphering the nature of the Higgs Sector" (CERN-2017-002).

A new report (LHC Higgs WG Report 5), focusing on physics goals and recommendations for LHC Run 4, is currently being prepared.

The meeting will be in-person at CERN, however a Zoom connection will be available for those who cannot travel to CERN.

Zoom connection details will only be visible to registered participants.

PHISHING ALERT!  PLEASE IGNORE ANY EMAILS ASKING FOR A DOCUSIGN AND CREDIT CARD DETAILS. This is a phishing attempt that has been reported to CERN.

 

A welcome drink, held jointly with the LHC EFT WG, will take place on the evening of Tuesday, December 2 at 18:00 in the Glassbox inside Restaurant 1.

The meeting will start with a joint LHC EFT / LHC Higgs session on Wednesday morning.

The workshop dinner will take place on Thursday evening, please see the dedicated page.

Please register if you plan to attend the workshop (either in-person or online).

Related events/meetings during the week:

LHCHWG2025.pdf
map_dinner_2025_full.png
LHC Higgs WG Steering Committee
Participants
337 View full list
  • Wednesday 3 December
  • Thursday 4 December
    • WG1 parallel session 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Alexander Karlberg (University of Oxford)
    • WG2 parallel session 40/S2-B01 - Salle Bohr

      40/S2-B01 - Salle Bohr

      CERN

      100
      Show room on map
      Convener: Lorenzo Rossini (University of Freiburg)
      • 22
        EFT Theory Uncertainties at the LHC (25'+5')
        Speaker: Francesco Montagno (IFAE Barcelona)
        EFT_Thoery_Uncertainties_at_the_LHC.pdf
      • 23
        Bridging theory and experiment in the search for CP violating Higgs interactions: Parametrizations and dictionary (25'+5')
        Speaker: Marta Fuentes Zamoro (UA Madrid)
        CPV_Higgs_dictionary_talk.pdf
      • 24
        Could electron-top interactions spoil the measurement of the Higgs trilinear? A quantitative estimate at future lepton colliders (25'+5')
        Speaker: Lucine Tabatt (Humboldt U. Berlin)
        Tabatt_eett_CERN-compressed.pdf
    • WG3 parallel session 40/R-D10

      40/R-D10

      CERN

      20
      Show room on map
      Convener: Rui Santos (ISEL and CFTC-UL)
      Recording_1st_parallel_WG3.mp4
      Recording_2nd_parallel_WG3.mp4
      • 25
        Using machine learning to predict large pseudoscalar H125 couplings to fermions (12'+3')

        Theories with multiple Higgs doublets allow Higgs couplings to significantly deviate from Standard Model values, enabling indirect probes of extra scalars. The observed couplings already place stringent limits on such theories. In this talk, I will review the situation in models with two Higgs doublets and then extend into three Higgs doublets. For more than two doublets, there are five possible types of models that avoid flavor changing neutral couplings at tree level by the addition of a symmetry. Using a machine learning optimization algorithm, we efficiently explore all five possible types of coupling choices and all five mass orderings of the neutral scalar bosons. We identify the model choices that allow a purely pseudoscalar coupling in light of all recent experimental limits, including direct searches for CP-violation, thus motivating increased effort into improving the experimental precision.

        Speaker: Rafael Boto (Instituto Superior Técnico)
        Boto_cpodd_wg3.pdf
      • 26
        A smoking gun signature of 3HDM (12'+3') [remote]

        We analyze new signals of a 3-Higgs Doublet Model (3HDM) at the Large Hadron Collider (LHC), where only one doublet acquires a Vacuum Expectation Value (VEV), preserving a Z2 parity. The other two doublets are inert and do not develop a VEV, leading to a dark scalar sector controlled by Z2, with the lightest CP-even dark scalar H1 being the DM candidate. This leads to the loop-induced decay of the next-to-lightest scalar, H2 → H1 ℓℓ (ℓ = e, µ), mediated by both dark CP-odd neutral and charged scalars. This is a smoking-gun signal of the 3HDM since it is not allowed in the 2-Higgs Doublet Model (2HDM) with one inert doublet and is expected to be important when H2 and H1 are close in mass. In practice, this signature can be observed in the cascade decay of the SM-like Higgs boson, h → H1H2 → H1H1ℓℓ into two DM particles and di-leptons or h → H2H2 → H1H1ℓℓℓℓ into two DM particles and four-leptons, where h is produced from gluon-gluon fusion (ggF). In order to test the feasibility of these channels at the LHC, we devise some benchmarks, compliant with collider, DM, and cosmological data, for which the interplay between these production and decay modes is discussed. In particular, we show that the resulting detector signatures, missing E_T + ℓℓ or missing E_T + ℓℓℓℓ, with the invariant mass of ℓℓ pairs much smaller than mZ, can potentially be extracted already from combining Run 2 and 3 data.

        Speaker: Atri Dey (DIAS)
        The 22nd Workshop of the LHC Higgs Working Group_Atri_Dey.pdf
      • 27
        LHC Signatures of a Vector-Like Top Partner and Charged Higgs Boson in the 2HDM-II (12'+3')

        I will present the collider phenomenology of a vector-like top partner (VLT) within the Type-II Two-Higgs-Doublet Model (2HDM-II) extended by a vector-like quark doublet. The study focuses on final states involving a charged Higgs boson. In this framework, the VLT predominantly decays through exotic channels, leading to signatures with high $b$-jet multiplicity and leptonic components. The analysis is based on Monte Carlo simulations of VLT pair production at the 14 TeV LHC, considering both fully hadronic and semi-leptonic final states. The discovery prospects are motivated by results showing that for $m_{H^\pm}=600$ GeV, a 5$\sigma$ sensitivity can be achieved for $m_T$ up to about 1.3 TeV at 300 fb⁻¹, extending to around 1.5 TeV at higher luminosities. The study further examines how the reach depends on the charged Higgs mass, luminosity, and systematic uncertainties.

        These results build upon our recent works: Phys. Rev. D 109 (2024) 055016, Phys. Rev. D 111 (2025) 095026, Eur. Phys. J. C 85 (2025) 2, and Eur. Phys. J. C 85 (2025) 500.

        Speaker: Mohammed Boukidi (IFJ PAN)
        LHCWG_Boukidi.pdf
      • 28
        Search for an invisible scalar in $t\bar{t}$ final states at the LHC (12'+3')

        We present a phenomenological study where an invisible scalar mediator is produced in association with a top-quark pair at the Large Hadron Collider (LHC). Using a $t\bar{t}$ experimental-like analysis, we search for light scalar particles that could be hidden in the $t\bar{t}$ final state. The signal process $pp \rightarrow t\bar{t}Y_0$ is generated within a simplified dark matter (DM) model implemented in MadGraph5_aMC@NLO, where the scalar mediator $Y_0$ couples to both Standard Model (SM) and DM particles. Scenarios with CP-even and CP-odd couplings of $Y_0$ to the top quarks are investigated for different mediator masses, ranging from very light scalars ($\sim 0$ GeV) up to values close to the Higgs boson mass (125 GeV). The analysis focuses on the dileptonic decay channel of the $t\bar{t}$ system, reconstructed through a kinematic fit without reconstructing the mediator. CP angular observables were used to probe the CP-nature of the mediator-top coupling, which allowed to set confidence level (CL) limits on the corresponding Yukawa couplings as a function of the mediator mass.

        Speaker: Rodrigo Capucha (Centro de Física Teórica e Computacional, FCUL)
        talkCern_RodrigoCapucha.pdf
      • 29
        Distinguishing $A\to HZ$ and $H\to AZ$ with top-quark spin correlations (12'+3')

        We propose angular observables sensitive to top-quark spin correlations to distinguish between the pseudoscalar $A\to HZ$ and the scalar $H\to AZ$ signals (where and denote CP-odd and CP-even Higgs bosons, respectively) in $Zt\bar t$ final states at the LHC. Current searches performed by ATLAS and CMS are insensitive to the CP nature of BSM scalar states in the case of identical production cross sections. In the context of the CP-conserving two-Higgs-doublet model, we demonstrate that, for a benchmark scenario with masses of 800 and 600 GeV, angular variables sensitive to top-quark spin correlations can differentiate between the two scenarios, even when the production rates are identical. These searches are of great interest in probing parameter space regions that predict a strong first-order electroweak phase transition.

        Based on: JHEP 06 (2025) 170 [arXiv:2502.03443], by F. Arco, T. Biekötter, P. Stylianou and G. Weiglein

        Speaker: Francisco Arco (DESY)
        Arco-LHCHWG.pdf
      • 30
        Charged Higgs Pairs at the LHC: A NLO Analysis (12'+3')

        Charged Higgs-pair production at hadron colliders provides an option to obtain information about the trilinear couplings involving charged Higgs states of BSM Higgs potentials. We analyze the corresponding production modes, Drell–Yan-like production, gluon fusion and vector-boson fusion at next-to-leading order with respect to the corresponding uncertainties originating from the scale dependence, the parton-density functions and strong coupling $\alpha_s$ at the LHC. We observe a significant reduction of the scale dependences after including the related radiative corrections. This analysis allows for a sophisticated interpretation of experimental measurements, once charged Higgs states will be observed.

        Speaker: Michael Spira (Paul Scherrer Institute)
        spira.pdf
    • WG4 parallel session 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Fabio Monti (CERN)
      Recording_2nd_parallel_WG4.mp4
      • 31
        The structure of quark mass corrections in the gg→HH amplitude at high-energy (15'+5')
        Speaker: Sebastian Eryk Jaskiewicz (University of Bern)
        LHCHWG4_jaskiewicz.pdf
      • 32
        New HH BSM benchmarks (15'+5')
        Speaker: Milada Margarete Mühlleitner (KIT)
        CERNBSMHHBenchmarks.pdf
      • 33
        ATLAS+CMS HHH recent results (15'+5')
        Speaker: Marko Stamenkovic (Brown University)
        20251204_HHH_ATLAS_CMS_LHCHIGGSWG.pdf
      • 34
        Direct probes of the quartic Higgs self-coupling (15'+5')
        Speaker: Gilberto Tetlalmatzi-Xolocotzi (Siegen University)
        CERN_Higgs_2025.pdf
    • 10:30
      Coffee break

      Coffee not provided, please use CERN cafeterias

    • WG1 parallel session 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Silvia Ferrario Ravasio (Università degli Studi di Torino)
      • 35
        Scattering amplitudes for 3-loop Higgs+Jet production (15'+3')

        arXiv:2504.06490

        Speaker: Xiang Chen (University of Zurich)
        LHCHiggsWG_Xiang_Chen.pdf
      • 36
        Interference effects in gluon-fusion Higgs boson production (15'+3') [remote]

        arXiv:2312.12384

        Speaker: Federica Devoto (SLAC)
        HiggsInterference_LHCHWG_2025.pdf
      • 37
        Higgs off-shell measurements at CMS using Run 2 data (15'+3')
        Speaker: Pedro Fernandez Manteca (CERN)
        251204_LHCHIGGSWG.pdf
      • 38
        Gluon fusion background for VBF (15'+3') [remote]
        Speaker: Christian Preuss (University of Goettingen)
        ctp-LHCHWG1-ggfbackground.pdf
      • 39
        Including QED effects in global PDF’s (15'+3') [remote]

        arXiv:2508.06603

        Speaker: Timothy J Hobbs (Argonne National Laboratory)
        HWG15_QED_Hobbs.pdf
    • WG2 parallel session 40/S2-B01 - Salle Bohr

      40/S2-B01 - Salle Bohr

      CERN

      100
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      Convener: Daniel Winterbottom (Imperial College)
      • 40
        VHbb CP analysis (19'+3') [remote]
        Speaker: Ricardo Barrué (Marietta Blau Institute for Particle Physics, Vienna)
        HWG_workshop_CPVWH_Ricardo_Barrué_v2.pdf
      • 41
        Search for anomalous HVV coupling in the gamma gamma final state (19'+3')
        Speaker: Federica De Riggi (Sapienza Università & INFN, Roma1)
        LHCHIGGSWG copia.pdf
      • 42
        Higgs-top coupling measurements from ATLAS and CMS (19'+3’) [remote]
        Speaker: Valentina 🐧 Vecchio (University of Manchester)
        LHCHiggsWG_VV25.pdf
      • 43
        Higgs to charm coupling (19'+3')
        Speaker: Ming-Yan Lee (Rheinisch Westfaelische Tech. Hoch.)
        LHCHWG_MingYanLee.pdf
    • WG3 parallel session 40/R-D10

      40/R-D10

      CERN

      20
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      Convener: Rui Santos (ISEL and CFTC-UL)
      Recording_1st_parallel_WG3.mp4
      Recording_2nd_parallel_WG3.mp4
      • 44
        LHC Constraints on Vector-like Quarks within the Two-Higgs-Doublet Model Framework (12'+3') [remote]

        We investigated the collider phenomenology of Vector-like Quarks (VLQs) - specifically the top ($T$) and bottom ($B$) quarks within the framework of the Two-Higgs-Doublet Model Type II (2HDM-II), considering both singlet and doublet representations. While current LHC searches constrain VLQs decaying exclusively into Standard Model (SM) final states, the presence of additional scalars in the 2HDM-II opens new exotic decay channels, such as $T \to H^+b$, $T \to Ht$, $T \to At$, $B \to Hb$, and $B \to Ab$, which can substantially modify the derived exclusion limits. Our findings show a significant weakening of the LHC mass bounds when decays into BSM Higgs bosons dominate: for the singlet $T$ quark (coupling $\propto \cot\beta$), the mass bound relaxes from $\approx 1.43 \text{ TeV}$ to $\approx 1.28 \text{ TeV}$, while for the $TB$ doublet, the limit dramatically drops from $\approx 1.54 \text{ TeV}$ to $\approx 0.99 \text{ TeV}$ (with $\mathcal{BR}(T \to H^+b) \sim 98\%$). Similarly, for the $B$ quark, the singlet case (2HDM-II+$B$) limit decreases to $\approx 1.3 \text{ TeV}$. The most pronounced weakening is observed for the $BY$ doublet, where the limit falls from $1.55 \text{ TeV}$ to $\approx 0.98 \text{ TeV}$ (due to high $\mathcal{BR}(B \to Hb)$ and $\mathcal{BR}(B \to Ab)$). These findings underline the crucial impact of exotic decay channels on experimental constraints for New Physics at the LHC.

        This work builds upon our recent results published in Eur.Phys.J.C 85 (2025) 11, 1275 and JHEP 03 (2025) 020.

        Speaker: Khawla Salime (Cadi Ayyad University, Marrakech)
        main.pdf
      • 45
        Strong First-Order Phase Transitions and Exotic Intermediate Phases in the CP-Conserving 2HDM (12'+3')

        Extended scalar sectors can significantly influence the cosmological evolution of the early universe. The additional scalar degrees of freedom allow for strong first-order phase transitions (SFOPT) into the electroweak-broken vacuum, which induce gravitational waves that, for sufficiently strong signals, might be detectable in the near future. Additionally, the universe might have undergone exotic intermediate phases such as charge-breaking or CP-violating phases via a multi-step phase transition.
        In this talk, the parameter space of the CP-conserving 2-Higgs-Doublet Model is investigated with the recent version 3 of the code BSMPT. Within this model, we study the viability of SFOPTs in light of the recent experimental data from Higgs measurements and exotic Higgs searches. We furthermore present selected benchmark points involving different phase histories such as single- and multi-step phase transitions possibly involving intermediate charge-breaking and CP-violating phases, and study their features such as the size of the trilinear Higgs couplings as well as the strength of their gravitational wave signals.

        Speaker: Christoph Borschensky (Karlsruhe Institute of Technology)
        LHC_Higgs_WG3_Borschensky_2025.pdf
      • 46
        Electroweak Baryogenesis with BARYONET: Theory and Applications (12'+3')

        I will present BARYONET, an open-source framework for computing the baryon asymmetry of the Universe within electroweak baryogenesis (EWBG). Starting from the semiclassical WKB approach, where spatially varying complex masses across expanding bubble walls generate CP-violating forces, we derive and solve the transport equations governing chemical potentials and velocity perturbations, leading to a quantitative prediction of the baryon asymmetry.
        The framework is validated against established formalisms and applied to benchmark scenarios, including singlet extensions, Two-Higgs-Doublet Models, and Higgs–$\phi^6$ setups. Alongside the implementation, we provide an updated and transparent treatment of key EWBG ingredients such as diffusion constants, interaction rates, and sphaleron processes. BARYONET thus offers an automated, reproducible pipeline connecting theoretical derivations with collider and gravitational-wave phenomenology. I will also present preliminary results on the interplay between collider constraints and the regions of parameter space that yield the observed baryon asymmetry in singlet(s) extensions of the Standard Model.

        Based on arxiv:2510.21915.

        Speaker: Giulio Barni (IFT Madrid)
        BARYONET_CERN_LHCHWG_2025_Giulio_Barni.pdf
      • 47
        V-associated production & vector boson fusion of Higgs bosons as an LHC signature of CP violation (12'+3')

        Many well-motivated extensions of the Standard Model predict new, entirely bosonic sources of CP violation (CPV). In these scenarios, the simultaneous observation of carefully selected bosonic processes emerges as a simple yet powerful method to unambiguously reveal the presence of CPV. The present study, which establishes a promising framework of CPV searches for the upcoming HL-LHC era, showcases this method by exploring the detectability of such generic CPV signatures within the economical Complex Two-Higgs Doublet Model (C2HDM). Specifically, we assess the observation prospects for viable combinations of gluon fusion, vector boson fusion and V-associated production processes which unequivocally signal the existence of CP-violating couplings within the bosonic spectrum of the model.

        Based on arXiv:2507.05942.

        Speaker: Alvaro Lozano Onrubia (IFT UAM-CSIC)
        Presentation_LHCHWG_Álvaro_Lozano_Onrubia.pdf
      • 48
        Probing Strong First-Order Electroweak Phase Transition scenarios in 2HDM with FCC-ee/CEPC (12'+3')

        We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their compatibility with projected precision electroweak and Higgs measurements, as well as searches for exotic Higgs bosons. We show that radiative corrections to $e^+e^-\to hZ$ production introduce deviations in the cross section that are resolvable with the anticipated sub-percent precision at lepton colliders even when experimental outcomes of the LHC and $Z$ pole measurements are in agreement with the SM. This underscores the opportunities of a precision lepton collider to explore BSM quantum corrections to the Higgs sector more broadly.

        Based on arXiv:2506.18555.

        Speaker: Anisha . (Karlsruhe Institute of Technology)
        Anisha_HWG.pdf
    • WG4 parallel session 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Fabio Monti (CERN)
      Recording_2nd_parallel_WG4.mp4
      • 49
        Public ggxy library (12'+3')

        ggxy is a C++ library which currently includes gg $\to$ HH up to NLO in QCD. It is able to produce differential distributions in about 30 minutes on a laptop, both for on-shell and MSbar top quark masses and including a 7-point scale variation. ggxy has been linked to Powheg and Herwig to enable the matching to parton showers. Runtime tests have shown that it is a faster a by a factor of 4-5 with respect to the previous implementations mainly due to the fast numerical evaluation of the one-loop 2 $\to$ 3 processes for the real corrections with Recola.

        Speaker: Kay Schonwald (U. of Zürich)
        HWG2025.pdf
      • 50
        Higgs-Pair Production via Gluon Fusion: Top-Yukawa- and light-quark-induced electroweak Corrections (12'+3')

        After the discovery of the Higgs boson in 2012, the measurements of the Higgs self coupling is still a challenge for current and future experiments in particle physics.
        Higgs-boson pair production via gluon fusion is a loop-induced process. In order to increase the accuracy of the theoretical predictions for this process, higher-order corrections are necessary to reduce theoretical uncertainties and to describe differential distributions reliably. The next-to-leading order (NLO) corrections involve the evaluation of two-loop Feynman diagrams. In particular, for electroweak (EW) corrections, many different mass scales appear in the calculation, such as the gauge boson, bottom, top quark, and Higgs boson masses. Further complications include numerical instabilities due to virtual thresholds which require careful treatment. In my talk, I will present results for the EW corrections induced by the top-Yukawa coupling with contributions from light-quark loops without using any reduction techniques to master integrals. The calculations are done by keeping the masses as fully symbolic parameters, allowing, in the future, for a study of parametric and mass scheme/scale uncertainties.

        Speaker: Sauro Carlotti (Karlsruher Institut für Technologie - ITP)
        Sauro_LHCHWG4_2025.pdf
      • 51
        Electroweak corrections to Higgs boson pair production: The light quark case (12'+3')

        We present a fully analytic computation of the two-loop electroweak corrections to double Higgs production in gluon fusion, mediated by light quarks. The calculation is performed using the method of differential equations, employing a large mass expansion to generate boundary functions. We implement the results in the POWHEG BOX framework for phenomenological studies. The corrections to the differential cross section are found to be sizable, reaching up to −15% near the production threshold. Additionally, we investigate the sensitivity of these corrections to variations in the triple Higgs self-coupling.

        Speaker: Philipp Rendler (Institute for Theoretical Physics, KIT)
        LHCHWG2025_Rendler.pdf
      • 52
        SMEFT and HEFT di-Higgs Event-Level Reweighting (12'+3')

        Di-Higgs (HH) production provides valuable information about loosely constrained quantities of the Higgs potential, such as the Higgs trilinear self-coupling. The measurement of these properties can confirm SM predictions or point to BSM physics, where non-resonant HH production is typically described by Effective Field Theories (EFTs).

        The event-level reweighting consists of parameterizing the HH cross section in terms of the EFT parameters appearing in the squared matrix element, and then performing a fit to obtain an analytical formula for the cross section. In this way, each point in parameter space can be described without the need for Monte Carlo event generation. This approach is particularly useful for probing such large parameter spaces.

        We discuss new formulas for both HEFT and SMEFT at 13 and 13.6 TeV, and the impact of higher dimensional formulas and its effects on the reweighting of NLO QCD gluon fusion samples.

        Speaker: Matheus Pereira Coelho (Center for Natural and Human Sciences, Federal University of ABC - UFABC)
        matheus_coelho_22LHCHWG_SMEFT_and_HEFT_di_Higgs_Event_Level_Reweighting.pdf
      • 53
        Higgs pair production via gluon fusion to higher orders in HEFT (12'+3')

        Higgs pair production offers the opportunity to probe correlations among the couplings of one or two Higgs bosons to fermions and gauge bosons. In this context, it serves as a powerful test of the underlying EFT framework. In this talk, we study Higgs pair production via gluon fusion within the Higgs Effective Field Theory (HEFT). We demonstrate that adopting a consistent power counting in combination with next-to-leading order (NLO) diagrams necessitates the inclusion of higher-dimensional operators beyond the leading ones. Finally, we analyze their phenomenological impact and provide a comparison to the Standard Model Effective Field Theory (SMEFT) at dimension six.

        Speaker: Konstantin Schmid (University and INFN Padova)
        Higgs_WG_Schmid.pdf
      • 54
        NMSSMScanner - Performing intelligent scans in the NMSSM parameter space (12'+3')

        In supersymmetric theories, the Higgs boson masses are calculated from the input parameters. Moreover, to be compatible with phenomenology, higher-order corrections have to be included in their derivation. Experimental analyses on the other hand resort to benchmarks with specific mass values. Given the large number of input parameters in the proposed supersymmetric extension, such as the NMSSM, the exploration of the parameter space, compatible with all existing constraints as well as with additional requests on the desired parameter sets, becomes difficult. We present the program package NMSSMScanner, based on the code NMSSMCALC, that applies machine learning techniques to efficiently consider all the relevant theoretical and experimental constraints. We provide sample benchmarks on the production of a pair of Higgs bosons, a SM-like plus a non-SM-like one, in various final states and with mass combinations that can be tested by the experimental groups.

        Speaker: Martin Gabelmann (U. Freiburg)
        NMSSMScanner_Martin_Gabelmann.pdf
    • 12:30
      Lunch break
    • Plenary (WG2) 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Jelena Jovicevic (Institute of Physics, University of Belgrade)
      • 55
        CP violation in the Higgs sector: Run 3 and beyond (19'+3')
        Speaker: Henning Bahl (ITP Heidelberg)
        2025_12_04_LHCHWG_general_meeting.pdf
      • 56
        Higgs decays in the SMEFT at NLO (19'+3')
        Speaker: Matthew Forslund (Princeton Center for Theoretical Science)
        MForslund_LHCHiggsWG.pdf
      • 57
        SMEFT, Anomalous Couplings and CPV from CMS and ATLAS (19'+3')
        Speaker: Daniel Winterbottom (Imperial College)
        LHCH_workshop_CPVEFT.pdf
      • 58
        Summary from the Higgs coupling measurements (Run 2 summary and available results from Run 3) from ATLAS and CMS (19'+3')
        Speaker: Serhat Ordek (Deutsches Elektronen-Synchrotron)
        HC_2and3_AandC.pdf
    • 15:30
      Coffee break 61/1-201 - Pas perdus

      61/1-201 - Pas perdus

      CERN
    • Plenary (WG4) 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Arantxa Ruiz Martinez (Univ. of Valencia and CSIC)
    • Workshop dinner Cave Valaisanne, Geneva

      Cave Valaisanne, Geneva

      Fondue (or dairy-free option) at Cave Valaisanne. Please register and pay (56 CHF) before 20th November if you plan to attend.

      map_dinner_2025_full.png
  • Friday 5 December
    • Plenary (WG1) 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Stephen Jones (IPPP Durham)
      Recording_WG1plenary_Friday.mp4
    • 10:30
      Coffee break 61/1-201 - Pas perdus

      61/1-201 - Pas perdus

      CERN
    • Cross-topic plenary 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Eleni Vryonidou (University of Cyprus)
      Recording_CrossTopicplenary.mp4
    • 12:45
      Lunch break
    • Lightning session for LHCHWG Report 5 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
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      Convener: Liza Brost (Brookhaven National Laboratory)
      Recording_LightningSession.mp4
      • 70
        [WG1] ttH NNLO+PS (7'+3')
        Speaker: Christian Biello (ETH Zurich)
        ttH-LHCHWG25.pdf
      • 71
        [WG1] Two-loop QCD corrections to ZH and off-shell Z boson pair production in gluon fusion (7'+3')

        https://arxiv.org/pdf/2509.07072

        Speaker: Dominik Grau (KIT)
        CERN_Grau_ZH_ZZ.pdf
      • 72
        [WG1] gg→ZH : updated predictions at NLO QCD including SMEFT contributions (7'+3')
        Speakers: Benjamin Campillo Aveleira (KIT), Gudrun Heinrich (KIT)
        ZH_Cern.pdf
      • 73
        [WG1] H+c/H+b associated production (7'+3')
        Speaker: Tiziano Bevilacqua (University of Zürich)
        LHCHWG_Tiziano_Bevilacqua_251205.pdf
      • 74
        [WG2] CPV benchmarks (7'+3')
        Speaker: Rui Santos (ISEL and CFTC-UL)
        WG3_Dec2025_CPviol.pdf
      • 75
        [WG3] Charged Higgs Pairs at the LHC: A NLO Analysis (7'+3')
        Speaker: Lisa Biermann (PSI)
        biermann_lhchwg25.pdf
      • 76
        [WG4] BSM benchmarks and interference effects (7'+3') [remote]
        Speaker: Kateryna Radchenko Serdula (DESY)
        LHCHWG22_Radchenko.pdf
      • 77
        [WG4] ggF HH QCD and EW higher-order corrections and theory uncertainties (7'+3')
        Speaker: Marco Bonetti (Eberhard Karls Universität Tübingen)
        BONETTI_20251205.pdf
    • 15:30
      Coffee break 61/1-201 - Pas perdus

      61/1-201 - Pas perdus

      CERN
    • Summary and closeout 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      162
      Show room on map
      Convener: Gaetano Barone (Brown University)
      Recording_ClosingSession.mp4
      • 78
        WG1 Higgs XS&BR: Outlook and Plans (10'+5') [remote]
        Speaker: Alessandro Calandri (Università & INFN, Firenze)
        Calandri_WG1summary_05122025.pdf
      • 79
        WG2 Higgs Properties: Outlook and Plans (10'+5')
        Speaker: Jelena Jovicevic (Institute of Physics, University of Belgrade)
        WG2outlook.pdf
      • 80
        WG3 BSM Higgs: Outlook and Plans (10'+5')
        Speaker: Rui Santos (ISEL and CFTC-UL)
        WG3_Dec2025_Sum_Santos.pdf
      • 81
        WG4 HH and multi-Higgs: Outlook and Plans (10'+5')
        Speaker: Arantxa Ruiz Martinez (Univ. of Valencia and CSIC)
        ARuiz_LHCHWG2025.pdf
      • 82
        Closing words from the Steering Committee (10'+5')
        Speaker: Gaetano Barone (Brown University)
        22nd Workshop Closing.pdf