The 20th Workshop of the LHC Higgs Working Group

13 Nov 2023, 09:00 → 15 Nov 2023, 22:30 Europe/Zurich

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).

Contribution requests should be addressed to the individual WG Conveners and the Steering Committee. 

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

If you will request financial assistance, you must register before October 1st and request it in the registration form. 

Zoom connection details will only be visible to registered participants.

Social events

• The workshop dinner will be held on Tuesday at 7pm, at Luigia Academy in Meyrin.  The set menu (3 courses) costs 60 CHF.  More details are here.
• There will be a joint drinks event with our LHC EFT colleagues on Wednesday at the end of the workshop (outside the Council Chamber).

Related events/meetings during the week

• 6th General Meeting of the LHC EFT Working Group November 16-17: https://indico.cern.ch/event/1296757/ 
• 113th Plenary ECFA Meeting November 16-17: https://indico.cern.ch/event/1220533/ 

Monday 13 November

09:00 → 10:30 Opening and Cross-Topic Plenary

09:00 Welcome (10')

Speaker: Katharine Leney (Southern Methodist University (US))

20th Workshop Introduction.pdf

09:10 CP violation in the Higgs couplings and beyond (20'+10')

Speaker: Henning Bahl

2023_11_13_LHCHWG_general_meeting_Bahl.pdf

09:40 LHC Higgs Working Group Plans (15'+5')

Speaker: Gudrun Heinrich (KIT)

LHC_HiggsWorkingGroup_Plans.pdf

10:00 Charting the Higgs self-coupling boundaries (20'+10')

Speaker: Gauthier Durieux (CP3 - UCLouvain)

durieux-lhchwg-2023-11-13.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 Cross-Topic Plenary

11:00 Triple Higgs production: A window on SM and BSM physics (20'+10') (remote)

Speakers: Benjamin Fuks, Tania Natalie Robens (Rudjer Boskovic Institute (HR))

HHH_fuks_merged.pdf

11:30 Monte Carlo harmonisation (20'+10') (remote)

Speaker: Xiaohu Sun (Peking University (CN))

HH-XiaohuSUN-2023-11-13-LHCHXSWG-HHMC.pdf

12:00 Updates from PDF global fits and aN3LO benchmarking (20'+10') (remote)

Speaker: Maria Ubiali

WG1PDF_ubiali.pdf

12:30 → 14:00 Lunch break and ATLAS visits

ATLAS visits

(sign up: https://docs.google.com/forms/d/e/1FAIpQLSdkggfv20kwPeYVHNd4JSWZnCfPPMmQ5qmOEBS0CgjJT_zdxw/viewform?usp=sf_link)

14:00 → 15:30 Plenary (WG2)

14:00 Recent couplings and cross-section measurements from ATLAS and CMS (15'+7', remote)

Speaker: Kunlin Ran (Deutsches Elektronen-Synchrotron (DE))

hCouplingXS20231113.pdf

14:22 Recent mass, width and CP results from ATLAS and CMS (15'+7', remote)

Speaker: Filippo Errico (Sapienza Universita e INFN, Roma I (IT))

FErrico_LHC_HWG.pdf

14:44 BSM interpretations of Higgs measurements (15'+7')

Speaker: Thomas Biekoetter

slides.pdf

15:06 Constraining ALPs with Higgs data via SMEFT (15'+7')

Speaker: Anke Biekoetter (JGU Mainz)

Higgs_WG_Biekoetter.pdf

15:30 → 16:00 Coffee break

16:00 → 17:30 Plenary (WG3)

16:00 Extended Higgs Sector Summary

Speaker: Tania Natalie Robens (Rudjer Boskovic Institute (HR))

wg3_upd.pdf

16:22 MSSM Working Group Summary

Speaker: Emanuele Angelo Bagnaschi (CERN/INFN Laboratori Nazionali di Frascati)

HXSWG-MSSM-2023-Bagnaschi_v5.pdf

16:44 Exotic Higgs Decays Summary

Speaker: Carlos Vazquez Sierra (Universidade de Santiago de Compostela (ES))

CVS_WG3_ExoticHiggsDecays.pdf

17:06 NMSSM Working Group Summary

Speaker: Daniel Winterbottom (Imperial College (GB))

NMSSM_plenary_2023_v2.pdf

Tuesday 14 November

09:00 → 10:30 Plenary (WG1)

09:00 ggF status report (20'+10')

Speaker: Stephen Philip Jones (University of Durham (GB))

table_comp.pdf

talkv2.pdf

09:30 VBF status report (20'+10')

Speaker: Mathieu Pellen (University of Freiburg)

VBF for general assembly.pdf

10:00 ggZH status and prospects (20'+10')

Speaker: Marco Vitti

HWG_Vitti.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 Plenary (WG4)

11:00 CMS HH experimental overview

Speaker: Bruno Alves (Centre National de la Recherche Scientifique (FR))

HHsearchesCMS_LHCWG4.pdf

11:15 ATLAS HH experimental overview

Speaker: Elisabeth Petit (CPPM, Aix-Marseille Université, CNRS/IN2P3 (FR))

ATLASresults_LHCHWG2023_141123.pdf

11:30 Higgs boson pair production at NLO in the POWHEG approach and the top quark mass uncertainties

Speaker: Emanuele Angelo Bagnaschi (CERN/INFN Laboratori Nazionali di Frascati)

HXSWG-HH-BAGNASCHI_v5.pdf

11:50 Higgs boson production in association with bottom quarks at NLO matched to parton showers

Speakers: Javier Mazzitelli, Javier Mazzitelli (Paul Scherrer Institut (CH))

bbH_background_mazzitelli.pdf

12:10 NLO EW corrections for di-Higgs production

Speaker: Kay Schönwald (University of Zuerich)

HWG_2023.pdf

12:30 → 14:00 Lunch break

14:00 → 15:30 Plenary (WG1 + Future Colliders)

14:00 ttH/tH status report (20'+10')

Speaker: Sergio Sanchez Cruz (Universitaet Zuerich (CH))

ttH_tH_LHC_Higgs_WG_SanchezCruz.pdf

14:30 Off-shell (20'+10')

Speaker: Rafael Coelho Lopes De Sa (University of Massachusetts (US))

RCLSA_HiggsWorkingGroup_2023_Offshell_final.pdf

15:00 ECFA Higgs/Top/Electroweak - overview, status and plans (20'+10')

Speaker: Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE))

2023-11-14 LHC Higgs WG - ECFA HiggsFactory WG 1 Higgs Top Electroweak.pdf

15:30 → 16:00 Coffee break

16:00 → 17:40 Anniversary Plenary

Conveners: Chiara Mariotti (INFN Torino (IT)), Giampiero Passarino (Torino University), Gian Piero Passarino (Universita e INFN Torino (IT)), Reisaburo TANAKA, Reisaburo Tanaka (LAL), Reisaburo Tanaka (IJCLab, Université Paris-Saclay (FR)), Stefan Dittmaier (Albert Ludwigs Universitaet Freiburg (DE)), Stefan Dittmaier (MPI fuer Physik)

16:00 Starting the LHC HXS WG - theory perspective

Speakers: Stefan Dittmaier (Albert Ludwigs Universitaet Freiburg (DE)), Stefan Dittmaier (MPI fuer Physik)

LHCHXSWG23.pdf

16:20 Starting the LHC HXS WG - experimental perspective

Speaker: Reisaburo Tanaka (IJCLab, Université Paris-Saclay (FR))

LHC_HiggsWG2023_ReiTanaka.pdf

16:40 The good and bad of the Yellow Reports

Speaker: Chiara Mariotti (INFN Torino (IT))

YellowReport-2023.pdf

YellowReport-2023.pptx

17:00 LHCHWG: the paradigm shift

Speakers: Giampiero Passarino (Torino University), Gian Piero Passarino (Universita e INFN Torino (IT))

HXS23.pdf

19:00 → 22:00 Workshop dinner

Wednesday 15 November

09:00 → 10:30 WG1 Higgs XS&BR parallel: Morning 1

09:00 Signal-Background interferfence effects in diphoton production beyond NLO QCD (17'+5')

Speaker: Federico Buccioni

buccioni_HWG23.pdf

09:22 Non-factorizable corrections to Higgs production in Vector Boson Fusion (15'+5')

Speaker: Dr Ming-Ming Long (KIT-TTP)

mmlong_LHCHWG2023.pdf

09:42 Improving NLO QCD event generators with high-energy EW corrections: ttH production (17'+5')

Speaker: Timea Vitos

CERN_Higgs_2023.pdf

10:04 Light quark Yukawa couplings from off-shell Higgs production (17'+5') [remote]

Speaker: Ramona Groeber (Università di Padova and INFN, Sezione di Padova)

offshell_ramona.pdf

09:00 → 10:30 WG2 Higgs Properties Parallel: Morning 1

09:00 Update on common format & toolchain for SMEFT parametrisations, STXS & beyond (15'+7')

Speaker: Eleonora Rossi (University of Oxford (GB))

example_1511.json

STXS param.pdf

09:22 STXS beyond 1.2 (CPV and other considerations), experimental view (15'+7')

Speaker: Benedict Tobias Winter (Albert Ludwigs Universitaet Freiburg (DE))

LHC-HiggsWG_2023.pdf

09:44 STXS in decays (15'+7')

Speaker: Michael Duehrssen-Debling (CERN)

note_STXS_Higgs_decay_definition.pdf

STXS in decays.pdf

10:06 STXS beyond 1.2, BSM view (15'+7', remote)

Speakers: Tilman Plehn, Tilman Plehn, Tilman Plehn (Heidelberg University)

cern_higgs_23.pdf

09:00 → 10:30 WG3 BSM Higgs Parallel: Morning 1

09:00 Charged Higgs Cross section Updates

Speaker: Emanuele Angelo Bagnaschi (CERN/INFN Laboratori Nazionali di Frascati)

HXSHWG-charged-2023-BAGNASCHI_v2.pdf

09:18 Recasts

Speaker: Dr Louie Dartmoor Corpe (Laboratoire de Physique de Clermont (LPC))

LCORPE_LHCHWG_Reinterpretations_15Nov2023.pdf

09:36 WG2+3 overview

Speaker: Tania Natalie Robens (Rudjer Boskovic Institute (HR))

wg2wg3.pdf

09:54 How to study n-Higgs doublet models

Speaker: Markos Maniatis (Departamento de Ciencias Basicas, UBB, Chillan, Chile)

maniatis.pdf

10:12 Search for X->Yh->VVtautau with the ATLAS detector [remote]

Speaker: Babar Ali (Czech Technical University in Prague (CZ))

bali_SHVVtautau_LHCHWG23.pdf

09:00 → 10:30 WG4 HH and multi-Higgs Parallel: Morning 1

09:00 Overview of triple Higgs physics at the LHC

Speaker: Marko Stamenkovic (Brown University (US))

20231115_HHH_LHC_WG.pdf

09:30 2HDM Triple Higgs couplings at NLO at the HL-LHC

Speaker: Kateryna Radchenko Serdula (DESY)

LHCWG_20th-Radchenko.pdf

09:50 NLO QCD corrections in the 2HDM

Speaker: Michael Spira (Paul Scherrer Institute (CH))

spira_hh.pdf

10:10 Vector-boson polarization in VBF di-Higgs production

Speaker: Anna Sophie Tegetmeier (Centre National de la Recherche Scientifique (FR))

VectorBosonPolarizationVBFdiHiggs.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 WG1 Higgs XS&BR parallel: Morning 2

11:00 CMS Hbb boosted produced via VBF or gluon-fusion (15') [remote]

Speaker: Jennet Elizabeth Dickinson (Fermi National Accelerator Lab. (US))

Dickinson_LHCHWG_CMSVBF_v1.pdf

11:15 ATLAS boosted Higgs results (15') [remote]

Speaker: Zhi Zheng (SLAC National Accelerator Laboratory (US))

Boosted_Higgs_1114.pdf

11:30 Discussion: CMS & ATLAS boosted Higgs results (15')

11:45 ATLAS off-shell results (15')

Speaker: Michiel Jan Veen (University of Massachusetts (US))

23_11_15_HWGWorkshop_offshell_mveen.pdf

12:00 CMS off-shell results (15') [remote]

Speaker: Savvas Kyriacou (Johns Hopkins University (US))

LHCWG_CMSOFF.pdf

12:15 Discussion: ATLAS & CMS offshell results

11:00 → 12:40 WG2 Higgs Properties Parallel: Morning 2

11:00 STXS - SM view and discussion intro

Speakers: Frank Tackmann (Deutsches Elektronen-Synchrotron (DE)), Frank Tackmann

2023-11-15_stxs_discussion.pdf

11:20 Discussion - The path to the next STXS binning

Speakers: Frank Tackmann (Deutsches Elektronen-Synchrotron (DE)), Frank Tackmann

2023-11-15_stxs_discussion_notes.txt

2023-11-15_stxs_discussion_summary.pdf

Beyond STXS 1.2 for boosted measurements.pdf

12:05 Constraints on EFT operators from Higgs property fits (20'+10', remote)

Speaker: Andrei Gritsan (Johns Hopkins University (US))

talk_LHCEFT_2023Nov15.pdf

11:00 → 12:30 WG3 BSM Higgs Parallel: Morning 2

11:00 Search for $h\rightarrow aa \rightarrow 2\mu 2b/2b2\tau$ with the CMS experiment

Speaker: Pallabi Das (Princeton University (US))

HiggsToAA_CMS_LHCHWG.pdf

11:15 Search for $h\rightarrow aa\rightarrow 4\gamma$ with the ATLAS experiment

Speaker: Peter Kramer (Johannes Gutenberg Universitaet Mainz (DE))

2023-11-15__LHC_Higgs_WG.pdf

11:30 Emerging jet probes of strongly interacting dark sectors

Speaker: Dr José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))

Zurita_EJ_recasting.pdf

11:45 SMEFT at NNLO+PS: $Vh$ production

Speaker: Luc Schnell (Max Planck Institute for Physics)

Vh Production.pdf

12:00 New Developments in MSSM Higgs Production and Decay

Speaker: Michael Spira (Paul Scherrer Institute (CH))

spira_mssm.pdf

12:15 2HDM scans

Speaker: Matteo Bonanomi (Hamburg University)

151123_2HDMComputations_MBonanom.pdf

11:00 → 12:30 WG4 HH and multi-Higgs Parallel: Morning 2

11:00 Resonant di-Higgs production in the RxSM: Pure resonant vs. full cross sections

Speaker: Alain Verduras

LHC_WG4_A.Verduras.pdf

11:20 New trigger strategies targeting HH events at the CMS experiment in Run 3

Speaker: Stephane Brunet Cooperstein (Univ. of California San Diego (US))

cooperstein_CMSHHtriggers_nov152023.pdf

12:30 → 14:00 Lunch break

14:00 → 15:30 Plenary joint with LHC EFT WG

14:00 SMEFT in the Higgs sector in CMS (15'+7')

Speaker: Alessandro Calandri (Eidgenoessische Technische Hochschule Zuerich (CH))

Calandri_HiggsEFT_15112023.pdf

14:22 SMEFT in ATLAS (15'+7')

Speaker: Eleonora Rossi (University of Oxford (GB))

ER_LHCWGmeeting_1511.pdf

14:44 Higgs-gluon coupling in SMEFT (and EFT H+HH plans) (15'+7')

Speaker: Stefano Di Noi (Università di Padova and INFN, Sezione di Padova)

HiggsEFT_DiNoi.pdf

15:06 Diboson production in the SMEFT from gluon fusion (15'+7')

Speaker: Marion Thomas (University of Manchester)

HWG_MarionThomas.pdf

15:30 → 16:00 Coffee break

16:00 → 17:30 Summary and Closeout Plenary

Conveners: Julie Malcles (IRFU-CEA, Université Paris-Saclay (FR)), Tim Cohen (CERN)

16:00 WG1 Higgs XS&BR: Outlook and Plans (10'+5')

Speaker: Dr Alexander Karlberg (CERN)

WG1 outlook.pdf

16:15 WG2 Higgs Properties: Outlook and Plans (10'+5')

Speaker: Sarah Heim (Deutsches Elektronen-Synchrotron (DE))

Higgs_WG2_summary.pdf

16:30 WG3 BSM Higgs: Outlook and Plans (10'+5')

Speaker: Alexis Kalogeropoulos (Kansas State University (US))

WG3summary_AK.pdf

16:45 WG4 HH and multi-Higgs: Outlook and Plans (10'+5')

Speaker: Javier Mazzitelli (Universidad de Buenos Aires (AR))

outlook_and_plans_WG4.pdf

17:00 Closeout (10')

LHC Higgs Working Group Closing.pdf

18:30 → 20:00 Joint drink with EFT friends