The 19th Workshop of the LHC Higgs Working Group
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).
We plan to hold the meeting in-person at CERN, but a video connection will be available for those who cannot travel to CERN.
If you will request financial assistance, you must register before October 30th and request it in the registration form.
Zoom connection and Mattermost discussion details will be sent to registered participants ahead of the start of the workshop.
Related events/meetings during the week
- 5th General Meeting of the LHC EFT Working Group on Friday, December 2nd 9am - 6pm: https://indico.cern.ch/event/1201401/
- 152nd LHCC Meeting with Poster Session on Tuesday November 29 and Open Session on Wednesday November 30:
https://indico.cern.ch/event/1208526/
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Conveners: Nan Lu (University of Science and Technology of China (CN)), Stefano Manzoni (CERN)
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New constraints on extended Higgs sectors from the trilinear Higgs coupling (10'+8')
The trilinear Higgs coupling is a crucial tool to determine the structure of the Higgs potential and to probe possible effects of physics beyond the Standard Model (SM). Focusing on a Two-Higgs-Doublet Model as a concrete example, I will discuss the calculation of the dominant two-loop corrections to the trilinear Higgs coupling, and show that this coupling can be significantly enhanced with respect to its SM prediction, in certain regions of parameter space. Taking into account all relevant corrections up to the two-loop level, I will demonstrate that the current experimental bounds on the trilinear coupling already rule out significant parts of the parameter space that would otherwise be unconstrained. Finally, I will present a benchmark scenario illustrating the interpretation of the current results and future measurement prospects.
Based on Bahl, Braathen, Weiglein 2202.03453, accepted for publication in Phys. Rev. Lett.
Speaker: Johannes Braathen (DESY) -
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Two-loop Yukawa corrections to double Higgs production (10'+8')
Double Higgs production will be a key observable to probe the structure of the Higgs potential. In this talk I will present the first step in obtaining the electroweak corrections to double Higgs production by considering the leading Yukawa corrections to this process in the high energy limit. I will describe the methods we used and show that we obtain precise numerical results down to $p_T \approx 100 \,$GeV.
based on JHEP 08 (2022) 259 (arxiv:2207.02587)
Speaker: Kay Schönwald (University of Zuerich) -
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Triple Higgs production in the SM and in models with singlet NP scalars at proton-proton colliders (10'+8')
In this talk we will discuss the production of three Higgs bosons in the LHC and at a proton-proton collider running at a centre-of-mass energy of 100 TeV. We will argue that the seemingly challenging 6-botton jets final state is a very good candidate to investigate triple Higgs production within and beyond the SM in proton-proton colliders. In particular we will consider three different scenarios: one in which the triple and quartic Higgs boson self-couplings are not affected by new physics phenomena besides the Standard Model (SM) and in addition, we will explore two possible SM extensions by one and two new scalars. We will show that a 100 TeV machine can impose competitive constraints on the quartic coupling in the SM-like scenario. In the case of the scalar extensions of the SM, we will show that large significances can be obtained in the LHC and the 100 TeV collider while obeying current theoretical and experimental constraints including a first order electroweak phase transition.
Speaker: Gilberto Tetlalmatzi-Xolocotzi (Siegen University) -
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Invariant mass distribution of di-Higgs production at HL-LHC in the 2HDM (10'+8')
The dominant Higgs pair production process in the HL-LHC is gluon fusion, which we study in the framework of the Two Higgs Doublet Model. As a key observable we evaluate the invariant mass distribution of two Higgses at 125 GeV in the final state. We analyze in particular the contribution of the resonant diagram involving a heavy CP-even Higgs boson exchange. We analyze the potential sensitivity to the triple Higgs couplings involved. We show that for the benchmark points where the resonant production is dominant, the contribution of different parameters of the extra scalar can be traced. These parameters are its mass, total decay width and relative sign of BSM Higgs trilinear and top Yukawa couplings. Finally, we discuss the effects of experimental uncertainties by applying smearing and binning to the invariant mass.
Speaker: Kateryna Radchenko Serdula (DESY) -
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Search for the Higgs boson pair production in the bbμ+μ− final state at the LHC (10'+8')
The Higgs boson pair production via gluon-gluon fusion and vector boson fusion in the bbμ+μ− final state at the LHC is studied to probe the Higgs self-coupling κλ and the four-boson HHVV coupling κ2V for the first time. A cut-based analysis and a machine learning analysis using boosted decision trees are performed with categorizations and optimizations depending on the variations of these couplings. The expected sensitivities are extracted with different luminosities assumed up to the full HL-LHC runs. The expected upper limit at 95% confidence level on the HH production is calculated as 47 (28) times the Standard Model cross-section using the cut-based method (boosted decision trees) for the gluon-gluon fusion production, and 928 for the vector boson fusion production, assuming an integrated luminosity of 3000 fb−1. The expected constraints on the couplings at 95% confidence level are calculated to be −13.8 < κλ < 19.1 (−10.0 < κλ < 15.5) and −3.4 < κ2V < 5.5 using the cut-based method (boosted decision trees), respectively, assuming an integrated luminosity of 3000 fb−1.
https://arxiv.org/abs/2207.10912
Speaker: Botao Guo (Peking University (CN))
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WG1 Higgs XS&BR parallel: Morning 1 503/1-001 - Council ChamberConveners: Dr Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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Higgs-boson production in top-quark fragmentationSpeakers: Colomba Brancaccio (CERN), Colomba Brancaccio
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ttH production in NNLO QCDSpeakers: Chiara Savoini (University of Zurich), Chiara Savoini
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Top Mass Effects in the Higgs pT distributionSpeaker: Vittorio Del Duca (Universita e INFN Torino (IT))
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WG2 Higgs Properties Parallel: Morning 1 500/1-001 - Main AuditoriumConveners: Mauro Donega (ETH Zurich (CH)), Nicolas Berger (Centre National de la Recherche Scientifique (FR))
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Summary of recent Higgs results (20'+10')Speaker: Alessandro Calandri (Eidgenoessische Technische Hochschule Zuerich (CH))
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SMEFT parametrisations for STXS and common format proposal (40'+20')Speakers: Ana Rosario Cueto Gomez (CERN), Mr Matthew Knight (Imperial College London)
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WG3 BSM Higgs Parallel: Morning 1 40/S2-A01 - Salle AndersonConveners: Abdollah Mohammadi (University of Wisconsin Madison (US)), Jana Schaarschmidt (University of Washington (US))
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Searches for X -> hY in the bb gamma gamma state (14'+6')Speaker: Dr Lata Panwar (Laboratoire de physique nucléaire et des hautes énergies (LPNHE), Paris, France)
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Update on from the Forum on the Interpretation of the LHC Results for BSM studies for extended scalar sectors (14'+6')Speaker: Lukas Alexander Heinrich (Technische Universitat Munchen (DE))
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Semi-dark Higgs decays: sweeping the Higgs neutrino floor (14'+6')Speaker: Jose Manuel Cano (IFT UAM/CSIC)
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Searches for Higgs decays to photon + meson at ATLAS (14'+6')Speaker: Robert James Ward (University of Birmingham (GB))
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10:30
Morning coffee
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Conveners: Nan Lu (University of Science and Technology of China (CN)), Stefano Manzoni (CERN)
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Top Yukawa corrections (20'+10')Speaker: Michael Spira (Paul Scherrer Institute (CH))
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Higgs Pair Production in a Composite 2HDM. (15'+5')Speaker: Felix Egle (Institute for Theoretical Physics (ITP), Karlsruhe Institute of Technology (KIT))
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Linking Higgs pair production with an SFOEWPT in a 2HDM-EFT (15'+5')Speaker: Lisa Biermann (Karlsruhe Institute of Technology (KIT))
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NLO+PS study of bbH background to HH (15'+5')Speakers: Javier Mazzitelli (Universidad de Buenos Aires (AR)), Javier Mazzitelli (Paul Scherrer Institut (CH)), Javier Mazzitelli
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WG1 Higgs XS&BR parallel: Morning 2 503/1-001 - Council ChamberConveners: Dr Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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Exact top-quark mass dependence in hadronic Higgs productionSpeaker: Mr Marco Niggetiedt
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V+jets background modeling in CMSSpeaker: Aliya Nigamova (University of Hamburg (DE))
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V+jets background modeling in ATLASSpeaker: Maria Mironova (Lawrence Berkeley National Lab. (US))
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ggZH 0+1J studies in ATLASSpeaker: Philipp Windischhofer (University of Chicago (US))
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WG2 Higgs Properties Parallel: Morning 2 500/1-001 - Main AuditoriumConveners: Daniele Barducci (Sapienza Universita e INFN, Roma I (IT)), Mauro Donega (ETH Zurich (CH))
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STXS binnings for CP sensitivity (20'+10')
The current Simplified Template Cross-Section (STXS) categorization leaves STXS analyses insensitive to CP-odd contributions in Higgs boson production, which are predicted by several models beyond the Standard Model. This presentation proposes to categorize events with two jets additionally via the dPhijj observable to make future Run 2+3 analyses sensitive to CP violation. The feasibility of such a splitting based on our present sensitivity is also discussed
Speaker: Benedict Tobias Winter (Albert Ludwigs Universitaet Freiburg (DE)) -
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Towards STXS 1.3 (20'+10')Speaker: Matteo Bonanomi (Hamburg University)
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Summary of WG2 CPV activity (20'+10')Speaker: Ken Mimasu (King's College London)
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WG3 BSM Higgs Parallel: Morning 2 40/S2-A01 - Salle AndersonConveners: Abdollah Mohammadi (University of Wisconsin Madison (US)), Jana Schaarschmidt (University of Washington (US))
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Interference Effects in BSM Processes with a Generalized Narrow-Width Approximation (14'+6')Speaker: Georg Ralf Weiglein (Deutsches Elektronen-Synchrotron (DE))
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SUSY-QCD Corrections to A Production in the MSSM (14'+6')Speaker: Lukas Fritz (Paul Scherrer Institut)
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Results from h->aa->2mu2b final stateSpeaker: Elham Khazaie (Isfahan University of Technology (IR))
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Results from h->aa->4gamma analysesSpeaker: Badder Marzocchi (Northeastern University (US))
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Higgs Mass Calculation in FeynHiggs (14'+6')Speaker: Henning Bahl
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12:30
Lunch
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Workshop Introduction 503/1-001 - Council ChamberConveners: Fabrizio Caola (University of Oxford (GB)), Gudrun Heinrich (KIT), Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE)), Katharine Leney (Southern Methodist University (US)), Liantao Wang, Mauro Donega (ETH Zurich (CH)), Predrag Milenovic (University of Belgrade (RS)), Roberto Salerno (CNRS/IN2P3 - LLR, École polytechnique), stefania gori (UC Santa Cruz)
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WelcomeSpeaker: Predrag Milenovic (University of Belgrade (RS))
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WG3 BSM Higgs Plenary 503/1-001 - Council ChamberConveners: Abdollah Mohammadi (University of Wisconsin Madison (US)), Jana Schaarschmidt (University of Washington (US))
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MSSMSpeaker: Emanuele Angelo Bagnaschi (INFN Laboratori Nazionali di Frascati)
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NMSSMSpeaker: Nikolaos Rompotis (University of Liverpool (UK))
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Summary of exotic Higgs decay resultsSpeaker: Rafael Coelho Lopes de Sa
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bbHSpeaker: Chayanit Asawatangtrakuldee (Chulalongkorn University (TH))
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15:30
Afternoon coffee
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Conveners: Elizabeth Brost (Brookhaven National Laboratory (US)), Javier Mazzitelli
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Brief IntroductionSpeaker: Elizabeth Brost (Brookhaven National Laboratory (US))
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ATLAS - experimental summary (10'+5')Speaker: William Balunas (University of Cambridge (GB))
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CMS - experimental summary (10'+5')Speaker: Torben Lange (National Institute of Chemical Physics and Biophysics (EE))
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Benchmarking resonant di-Higgs production in extended scalar sectors (20'+10')Speaker: Duarte Azevedo (ITP/IAP - Karlsruher Institut für Technologie)
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HH at N3LO+N3LL(20'+10')Speakers: AJJATH A H, Ajjath ABDUL HAMEED (LPTHE, Paris)
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Effective Field Theories in Higgs boson pair production(20'+10')Speaker: Jannis Lang
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Cross Topic Plenary: Discussion: recognition of junior members of the LHCHWG 503/1-001 - Council ChamberConveners: Fabrizio Caola (University of Oxford (GB)), Gudrun Heinrich (KIT), Liantao Wang, stefania gori (UC Santa Cruz)
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Discussion
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WG1 Higgs XS&BR Plenary: Part A 500/1-001 - Main AuditoriumConveners: Dr Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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IntroductionSpeakers: Dr Alexander Karlberg (CERN), Bernhard Mistlberger, Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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VBF group reportSpeaker: Stephane Brunet Cooperstein (Univ. of California San Diego (US))
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Cross Topic Plenary: Part A 500/1-001 - Main AuditoriumConvener: Dr Alexander Karlberg (CERN)
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Issues in single and double Higgs production in BSM models (15'+8')Speaker: Michael Spira (Paul Scherrer Institute (CH))
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Double Higgs production in extended Higgs sectors (15'+8')Speaker: Milada Margarete Mühlleitner
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Top mass renormalization scheme uncertainties in Higgs cross sections (15'+8')Speakers: Javier Mazzitelli, Javier Mazzitelli (Paul Scherrer Institut (CH)), Javier Mazzitelli (Universidad de Buenos Aires (AR))
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11:00
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12:30
Lunch
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WG2 Higgs Properties Plenary 30/7-018 - Kjell Johnsen AuditoriumConveners: Daniele Barducci (Sapienza Universita e INFN, Roma I (IT)), Ken Mimasu (King's College London)
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CP properties and the connection to Baryogenesis (20'+10')Speaker: Elina Fuchs (CERN)
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Higgs properties: present and future (20'+10')Speaker: Christophe Grojean (DESY (Hamburg) and Humboldt University (Berlin))
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Prospects for CP measurements in ttH (20'+10')Speaker: Dorival Gonçalves (Oklahoma State University)
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WG1 Higgs XS&BR Plenary: Part B 30/7-018 - Kjell Johnsen AuditoriumConveners: Dr Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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ttH/tH updateSpeaker: Marco Zaro (Università degli Studi e INFN Milano (IT))
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16:00
Afternoon coffee
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WG1 Higgs XS&BR Plenary: Part C 30/7-018 - Kjell Johnsen AuditoriumConveners: Dr Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC National Accelerator Laboratory (US)), Julie Malcles (Université Paris-Saclay (FR)), Roberto Di Nardo (Università e INFN Roma Tre (IT))
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VH updateSpeaker: Hannah Arnold (Nikhef)
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Workshop Dinner at Luigia Academy in Meyrin Luigia Academy in Meyrin
Luigia Academy in Meyrin
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09:00
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12:30
Lunch
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Cross Topic Plenary: Part B 30/7-018 - Kjell Johnsen AuditoriumConvener: Ken Mimasu (King's College London)
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LHC EFT WG report (15'+8')Speaker: Andrew Gilbert (Northwestern University (US))
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Interpreting SMEFT results in extended scalar sectors (15'+8')Speaker: Samuel Homiller (Harvard University)
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SM and BSM Higgs - conclusions from the Snowmass process (15'+8')Speaker: Caterina Vernieri (SLAC National Accelerator Laboratory (US))
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ECFA Higgs/Top/Electroweak - an overview (10'+4')Speaker: Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE))
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15:30
Afternoon coffee
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Summary, Plans, Outlook, and Closeout Plenary 30/7-018 - Kjell Johnsen AuditoriumConveners: Gudrun Heinrich (KIT), Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE)), Katharine Leney (Southern Methodist University (US)), Liantao Wang, Mauro Donega (ETH Zurich (CH)), Predrag Milenovic (University of Belgrade (RS)), Roberto Salerno (CNRS/IN2P3 - LLR, École polytechnique), stefania gori (UC Santa Cruz)
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WG1 Higgs XS&BR: Outlook and PlansSpeaker: Bernhard Mistlberger (SLAC National Accelerator Laboratory (US))
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WG2 Higgs Properties: Outlook and PlansSpeaker: Daniele Barducci (Sapienza Universita e INFN, Roma I (IT))
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WG3 BSM Higgs: Outlook and PlansSpeaker: Abdollah Mohammadi (University of Wisconsin Madison (US))
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CloseoutSpeaker: Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE))
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09:00