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The 21st Workshop of the LHC Higgs Working Group

4–6 Dec 2024
Europe/Zurich timezone

LHC Higgs WG Steering Committee

Contribution List

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44. Workshop opening
Julie Malcles (IRFU-CEA, Université Paris-Saclay)
04/12/2024, 09:00
71. LHCb meets the LHC Higgs WG (10'+5')
Davide Zuliani (University and INFN Padova)
04/12/2024, 09:15
64. EFT/Higgs Experimental Summary (20'+10')
Tae Hyoun Park (Max-Planck Institute for Physics)
04/12/2024, 09:30
65. EFT Meets Cosmology (20'+10')
Johan Löfgren (Uppsala)
04/12/2024, 10:00
66. STXS Predictions (12'+3')
Ken Mimasu (University of Southampton)
04/12/2024, 11:00
67. EFT Interpretation of CMS VH(bb) (15'+5')
Alessandro Calandri (ETH Zuerich)
04/12/2024, 11:15
68. Running Effects in Higgs SMEFT (15'+5')
Stefano Di Noi (KIT)
04/12/2024, 11:35
69. SMEFiT (15'+5')
Luca Mantani (IFIC Valencia)
04/12/2024, 11:55
70. SMEFT/Higgs Experimental Outlook (20'+10')
Giacomo Boldrini (LLR Palaisau - CNRS)
04/12/2024, 12:15
2. Introduction
Alessandro Calandri (ETH Zuerich), Alexander Karlberg (CERN), Bernhard Mistlberger (SLAC), Hannah Arnold (Stony Brook University)
04/12/2024, 14:00
3. ggF status report (17'+5')
Alessandra Cappati (Université Catholique de Louvain), Robin Hayes (Nikhef)
04/12/2024, 14:10
4. VBF status report (17+5') [remote]
Jiayi Chen (Simon Fraser University)
04/12/2024, 14:32
5. VH status report (17'+5')
Matthew Lim (University of Sussex)
04/12/2024, 14:54
20. MSSM working group summary (15'+3')
Emanuele Angelo Bagnaschi (INFN Frascati)
04/12/2024, 16:00
21. bbH: subgroup report and NNLO+PS generators in the massless and massive schemes (15'+3')
Christian Biello (Max-Planck Institute for Physics)
04/12/2024, 16:18

We provide an update on the status of Higgs production in association with a bottom-quark pair, highlighting recent developments by the bbH subgroup. We discuss the differences between the two flavour schemes and their state-of-the-art predictions, including cross-section interpolations for 13.6 TeV. Additionally, we report on novel event generators developed in the massless and massive scheme...
22. NMSSM subgroup report (15'+3')
Milada Margarete Muehlleitner (KIT)
04/12/2024, 16:36
23. Exotic decays subgroup: Axion-like particle connections to the Higgs and top (15'+3')
Anke Biekoetter (JGU Mainz)
04/12/2024, 16:54
24. Extended scalar sector subgroup report (15'+3')
Khawla Jaffel (University of Science and Technology of China)
04/12/2024, 17:12
54. Exotic decays of Higgs bosons to LLPs (ATLAS and CMS)
Dominique Trischuk (Brandeis University)
05/12/2024, 09:00
31. Higgs+charm ATLAS (10'+10')
Elliot Reynolds (University of Kansas)
05/12/2024, 09:00
52. Rare and Exotic Higgs decays in CMS (15'+3')
Lakshmi Pramod (DESY)
05/12/2024, 09:00
51. Rare and exotic Higgs decays in ATLAS (15'+3')
Diallo Boye (Brookhaven National Laboratory)
05/12/2024, 09:18
32. Higgs+charm CMS (10'+10')
Tiziano Bevilacqua (University of Zuerich)
05/12/2024, 09:20
55. A log story short: running contributions to radiative Higgs decays in SMEFT (20'+5')
Guilherme Guedes (DESY)
05/12/2024, 09:25
29. Introduction
Arantxa Ruiz Martinez (IFIC Valencia), Fabio Monti (CERN), Ludovic Michel Scyboz (Monash University), Milada Margarete Mühlleitner (KIT), Stefano Manzoni (CERN)
05/12/2024, 09:30
63. LLPs from Exotic Higgs decays using faraway sub-detectors (15'+3')
Nathan Grieser (University of Cincinnati)
05/12/2024, 09:36
38. Triple Higgs searches in ATLAS
William Balunas (University of Cambridge)
05/12/2024, 09:40
49. yt-induced Hbb as a background for HH searches (17'+5')
Marco Zaro (Università degli Studi and INFN Milano)
05/12/2024, 09:40
56. Interference effects in gg→H→Zγ beyond Leading Order (20'+5') [remote]
Federico Buccioni (Technical University of Munich)
05/12/2024, 09:50
45. Higgs Mass Predictions in the CP-Violating High-Scale NMSSM (15'+3')
Christoph Borschensky (KIT)
05/12/2024, 09:54

In a supersymmetric theory, large mass hierarchies can lead to large uncertainties in fixed-order calculations of the SM-like Higgs mass. A reliable prediction is then obtained by performing the calculation in an effective field theory (EFT) framework, involving the matching to the full supersymmetric theory at the high scale to include contributions from the heavy particles, and a subsequent...
39. Overview of triple Higgs theory
Tania Natalie Robens (Rudjer Boskovic Institute)
05/12/2024, 10:00
33. ttHbb highlights/summary of the WG1 - ttH/tH workshop (10'+10')
Matthias Schroeder (University of Hamburg)
05/12/2024, 10:02

WG1 ttH/tH workshop: https://indico.cern.ch/event/1440845/
46. Recent developments in NMSSMCALC (15'+3') [remote]
Martin Gabelmann (DESY)
05/12/2024, 10:12

Supersymmetry is among the most promising BSM frameworks solving many of the SM's theoretical and experimental shortcomings as well as providing a rich phenomenology across all sectors of the theory. The Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM) is a natural successor of minimal supersymmetry providing a richer phenomenology in many regards such as e.g. more sources of...
34. Updated ttHbb results ATLAS (10'+10')
Alexander Froch (Université de Genève)
05/12/2024, 10:22
41. Multi-Higgs Production and the Electroweak Phase Transition
Osama Karkout (Nikhef)
05/12/2024, 10:30

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...
57. CP-sensitive observables in STXS ttH cross sections (20'+5')
Alberto Carnelli (IRFU Saclay - CNRS)
05/12/2024, 10:35
35. VHcc ATLAS+CMS focusing on modelling uncertainties (20'+10')
Zhuoran Feng (Nikhef)
05/12/2024, 10:42
42. Effect of anomalous HHH and ZZHH couplings on the decay width of H→4l [remote]
Biswajit Das (The Institute of Mathematical Sciences, Chennai)
05/12/2024, 10:50

Despite the discovery of the Higgs boson, the Higgs sector of the standard model is still not fully established. In particular, the self-couplings of the Higgs boson and its couplings with gauge bosons are still to be fully determined. We consider electroweak corrections to the processes H --> ve ve~ vm vm~ and H --> e+ e- mu+ mu-. The corrections depend on the HHH coupling. We investigate...
48. MSSM Higgs boson production via gluon fusion (15'+3')
Michael Spira (Paul Scherrer Institute)
05/12/2024, 10:50
59. Probing CPV with DPhijj in H→WW (ATLAS) (20'+5') [remote]
Cameron Clarry (University of Toronto)
05/12/2024, 11:00
61. Updates on charged Higgs cross sections (15'+3')
Emanuele Angelo Bagnaschi (INFN Frascati)
05/12/2024, 11:08
43. Double Higgs production in vector boson fusion at NLO QCD with anomalous couplings
Jens Braun (KIT)
05/12/2024, 11:10

We present a calculation of the NLO QCD corrections to Higgs boson pair production in vector boson fusion, combined with the leading operators parametrising anomalous interactions in non-linear Effective Field Theory (HEFT). Based on our Monte Carlo implementation using GoSam+Whizard, we investigate the effects of anomalous Higgs couplings on various observables.
36. VHbb ATLAS+CMS focusing on modelling uncertainties (20'+10')
Christina Reissel (MIT)
05/12/2024, 11:12
60. Off-shell coupling measurements (CMS) (20'+5')
Andrei Gritsan (Johns Hopkins)
05/12/2024, 11:25
62. Extended scalars and dark matter (15'+3')
Rui Santos (ISEL and CFTC-UL)
05/12/2024, 11:26
83. Multi-Higgs production from VBS in HEFT (15'+5')
Javier Martínez Martín (Universidad Complutense de Madrid & IPARCOS)
05/12/2024, 11:30

We computed some results for vector boson scattering  in HEFT for the production of 2, 3 and 4 Higgs bosons. This results are updated after the latest results from both CMS and ATLAS for single and double Higgs production.
37. PDF uncertainties on predictions for Higgs production in gluon-gluon fusion (15'+5')
Maria Vittoria Garzelli (University of Hamburg)
05/12/2024, 11:42

Lightning talk
47. Higgs to dark showers (15'+3')
Emre Sitti (ETH Zuerich)
05/12/2024, 11:44
84. Recasting in resonant di-Higgs searches (15'+3')
Daniele Barducci (University and INFN Pisa)
05/12/2024, 12:02
9. ttH/tH status report (17'+5')
Judith Katzy (DESY)
05/12/2024, 14:00
10. Off-shell status report (17'+5')
Raoul Horst Roentsch (Università degli Studi and INFN Milano)
05/12/2024, 14:22
11. BR status report (10'+5')
Michael Spira (Paul Scherrer Institute)
05/12/2024, 14:44
17. Higgs physics at future colliders (20'+10')
Matthew Philip McCullough (CERN)
05/12/2024, 15:00
26. Measurements of Higgs couplings to fermions and interpretations of Higgs XS measurements at ATLAS and CMS (17'+5')
Jelena Jovicevic (Institute of Physics, University of Belgrade)
05/12/2024, 16:00
25. Measurements of Higgs couplings to bosons at ATLAS and CMS (17'+5') [remote]
Jeffrey Davis (Johns Hopkins)
05/12/2024, 16:22
27. BSM & SMEFT Interpretation of Higgs measurements at LHC and HL-LHC (17'+5')
Ken Mimasu (University of Southampton)
05/12/2024, 16:44
28. Non-linear CP violation (17'+5') [remote]
Akanksha Bhardwaj (Oklahoma State University)
05/12/2024, 17:06
18. Updates from PDF global fits (20'+10')
Joey Huston (Michigan State University)
06/12/2024, 09:00
30. STXS Overview (15'+5') [remote]
Matteo Bonanomi (University of Hamburg)
06/12/2024, 09:30
50. Finite Width and Interference (15'+5')
Georg Ralf Weiglein (DESY)
06/12/2024, 09:50
19. Accessing the Electroweak Phase Transition through Top Quark and Higgs Boson Production (15'+5')
Lisa Biermann (Paul Scherrer Institute)
06/12/2024, 11:15

If a first-order electroweak phase transition is realized by an extended scalar sector, this impacts observables at (future) colliders. In this talk I will discuss multiple SM extensions that allow for strong first-order electroweak phase transitions: Two-Higgs Doublet Model (2HDM), Next-to-Minimal Two-Higgs Doublet Model (N2HDM), and two dimension-six effective field theory extensions of the...
12. Overview of HH searches at ATLAS
Arantxa Ruiz Martinez (IFIC Valencia)
06/12/2024, 11:35
13. Overview of HH searches at CMS
Torben Lange (National Institute of Chemical Physics and Biophysics, Tallinn)
06/12/2024, 11:50
14. VBF HH with Powheg
Simon Reinhardt (University of Tuebingen)
06/12/2024, 12:05
15. NLO EW corrections on gg→HH cross section [remote]
Huai-Min Yu (Peking University)
06/12/2024, 12:25
16. Resonant HH production: interference effects and higher-order corrections
Kateryna Radchenko Serdula (DESY)
06/12/2024, 12:45
53. WG3: Rare and Exclusive Higgs boson decays (7'+3')
David d'Enterria (CERN), Van Dung Le (Ho Chi Minh City University)
06/12/2024, 14:00
58. WG3: Intelligent Scans in the NMSSM at Highest Precision (7'+3')
Felix Egle (KIT), Felix Egle (DESY)
06/12/2024, 14:10
77. WG1: Parton shower aspects of Vector Boson Fusion Higgs production (7'+3') [remote]
Jiayi Chen (Simon Fraser University)
06/12/2024, 14:20
78. WG1: Resummed predictions for VH (7'+3') [remote]
Kajal Samanta (IPPP Durham)
06/12/2024, 14:30
82. WG1: NLO ggZH differential prediction (7'+'3') [remote]
Marco Vitti (KIT)
06/12/2024, 14:40
79. WG2: Recommendation for ATLAS + CMS full-likelihood publications (7'+3') [remote]
Nicholas Wardle (Imperial College)
06/12/2024, 14:50
80. WG2: CPV STXS, CPV benchmark call in BSM models and dictionary note on different CPV parametrizations (7'+3') [remote]
Henning Bahl (Heidelberg University)
06/12/2024, 15:00
81. WG4: HH physics at 14 TeV (15'+5') [remote]
Javier Mazzitelli (Paul Scherrer Institute)
06/12/2024, 15:10
72. WG1 Higgs XS&BR: Outlook and Plans (10'+5') [remote]
Hannah Arnold (Stony Brook University)
06/12/2024, 16:00
73. WG2 Higgs Properties: Outlook and Plans (10'+5')
Pier Paolo Giardino (UAM and IFT Madrid)
06/12/2024, 16:15
74. WG3 BSM Higgs: Outlook and Plans (10'+5')
Tatjana Lenz (University of Bonn)
06/12/2024, 16:30
75. WG4 HH and multi-Higgs: Outlook and Plans (10'+5')
Fabio Monti (CERN)
06/12/2024, 16:45
76. Closing words from the Steering Committee (10'+5')
Ennio Salvioni (University of Sussex)
06/12/2024, 17:00
85. Anomalous couplings in Higgs+jet production at NLO QCD with full mt dependence (15'+5')
Gudrun Heinrich (KIT)

Lightning talk
8. BR status report
7. Off-shell status report
1. Thursday Plenary 1
40. Triple Higgs searches in CMS [tbc]
6. ttH/tH status report
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