Double Higgs Production at Colliders Workshop

4 Sept 2018, 08:00 → 9 Sept 2018, 09:00 America/Chicago

One West (WH1W) (Fermilab)

Biagio Di Micco (Universita' degli Studi di Roma Tre e Istituto Nazionale di Fisica Nucleare (INFN)), Christoph Peter Englert (University of Glasgow (GB)), Giacomo Ortona (Centre National de la Recherche Scientifique (FR)), John Alison (University of Chicago (US)), Maxime Gouzevitch (Centre National de la Recherche Scientifique (FR)), Olivier Bondu (Universite Catholique de Louvain (UCL) (BE)), Sara Lynn Dawson (Brookhaven National Laboratory (US))

This workshop aims at gathering together both theorists and ATLAS/CMS experimentalists to discuss recent results, analysis techniques and theoretical calculations of HH production.

•  Recent results from LHC 
•  Advances in theoretical calculations 
•  Analysis techniques
•  BSM phenomenology
•  EFT interpretations

Organizing committee:
John Alison (Carnegie Mellon University)
Olivier Bondu (FNRS/CP3-U C Louvain) 
Sally Dawson (Brookhaven National Laboratory)
Biagio Di Micco (U/INFN Roma Tre)
Christoph Englert (U Glasgow)
Maxime Gouzevitch (CNRS/UCB Lyon 1-IPNLyon)
Giacomo Ortona (CNRS/LLR)

Local organization committee:
Luca Cadamuro (Florida U)
Marcela Carena (U Chicago/Fermilab)
Jacobo Konigsberg (Florida U)
Zhen Liu (Fermilab/U Maryland-chair)
Caterina Vernieri (Fermilab-chair)

LPC events committee:
Gabriele Benelli (Brown U)
Ben Kreis (Fermilab)
Nicola De Filippis (Politecnico & INFN Bari)

Diversity and inclusion at Fermilab
http://diversity.fnal.gov/policies/

 

ConferencePicture.jpg

HH_map.pdf

Poster

RestaurantsnearFermilab.pdf

Tuesday 4 September

08:00 → 09:00 Registration

09:00 → 09:40 Welcome and introduction

09:00 Welcome to FNAL and LPC

Speakers: Caterina Vernieri (Fermi National Accelerator Lab. (US)), Marcela Carena (Fermilab), Sergo Jindariani (Fermi National Accelerator Lab. (US))

FNAL-HH-welcome.pdf

LPC_in_pictures.pdf

Welcome-HH-2018.pdf

09:20 Introduction

Speaker: Biagio Di Micco (Universita' degli Studi di Roma Tre e Istituto Nazionale di Fisica Nucleare (INFN))

diHiggs_Fermilab_04_09_2018.pdf

09:40 → 10:30 Summary: LHC status

Conveners: Caterina Vernieri (Fermi National Accelerator Lab. (US)), John Alison (University of Chicago (US))

09:40 CMS experimental status on hh production search (20+5)

Speaker: Abdollah Mohammadi (Kansas State University (US))

HH_Abdollah.pdf

10:05 ATLAS experimental status on hh production search (20+5)

Speaker: Marc Escalier (LAL-Orsay (FR))

escalier_HH_workshop_Fermilab.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 Theory overview

Convener: Zhen Liu (Fermilab)

11:00 Latest SM predictions (25+5)

Speaker: Javier Mazzitelli (University of Zurich)

mazzitelli_hh.pdf

11:30 Trilinear Higgs self-coupling extraction from single Higgs measurements (25+5)

Speaker: Stefano Di Vita (Università degli Studi e INFN Milano (IT))

divita-trilinear_from_single_h-fermilab_hh_workshop.pdf

12:00 Trilinear Higgs self-coupling determination from single-Higgs differential measurements (25+5)

Speaker: Ambresh Shivaji (UC Louvain)

Trilinear_Shivaji.pdf

12:30 → 13:00 Summary: Future colliders

Convener: Nicola De Filippis (Politecnico e INFN Bari (IT))

12:30 HL-LHC projections and YR status (20+5)

Speaker: Stefania Gori (University of Cincinnati (US))

TalkFermilab.pdf

13:00 → 14:00 Lunch break

14:00 → 15:00 Summary: Future Colliders

Convener: Nicola De Filippis (Politecnico e INFN Bari (IT))

14:00 Higgs physics at Future Circular colliders (ee/hh) (25+5)

Speaker: Anadi Canepa (Fermi National Accelerator Lab. (US))

AnadiCanepa_FCC.pdf

14:30 Higgs physics at ILC/CLIC (25+5)

Speaker: Philipp Roloff (CERN)

double_higgs_colliders_roloff.pdf

15:00 → 16:00 Summary: Combination of single and double Higgs measurements

Conveners: Biagio Di Micco (Universita' degli Studi di Roma Tre e Istituto Nazionale di Fisica Nucleare (INFN)), Maxime Gouzevitch (Centre National de la Recherche Scientifique (FR))

15:00 ATLAS HH combination results (20+5)

Speaker: Petar Bokan (Uppsala University (SE), Georg-August-Universitaet Goettingen (DE))

HHcombinationATLAS_PetarBokan_180904.pdf

15:25 CMS HH combination results (20+5)

Speaker: Luca Cadamuro (University of Florida (US))

HH_CMS_Combination.pdf

16:00 → 16:30 Coffee break

16:30 → 17:45 Discussion

Conveners: Biagio Di Micco (Universita' degli Studi di Roma Tre e Istituto Nazionale di Fisica Nucleare (INFN)), Javier Mazzitelli (Universidad de Buenos Aires (AR)), John Alison (Carnegie-Mellon University (US)), Dr Ramona Groeber (IPPP Durham)

1. ATLAS+CMS combination (Luca C., David W., Javier M.,  B. Di Micco) - Wednesday  Room Ramsey 

• based on 2015+2016 in preparation of the Run-2 legacy

• MC settings (NLO vs LO )

• Single H+HH combination

• Total cross section vs k_lambda + uncertainties

 

   2) How to make results public  (J. Allison, Max S., K. Leney) -  Friday 1W (17:30 - 18:30)

 

• Tools to provide unfolded UL

  • How to handle bbb correlations?

• Resonant: Gamma vs Mx plot?

  • How to reweight different widths?

• cut based results

• differential results in m_HH (truth vs. reco)

• Special care for BDT-based results

 

  3) EFT (S. Di Vita, M. Gouzevitch, J. Robinson) [17:30 - 18:30] 11th  floor ROC

• Which framework? More operators beyond O6

• How to make EFT useful for model testing?

• Which inputs from H and HH?

• Which topology? ggF/VBF single H background?

• Usage of shape benchmarks

 

4) BSM  (M. Carena, K. Tschann-Grimm, Ian Lewis, Lian-Tao Wang, X. Carvalho) Wednesday 11th floor ROC - Room One West

• Benchmark models : which one ?

  • Resonant: Is graviton still a good benchmark?

  • Interplay with VV

• Motivations for H1->H2 h

• Interference with SM HH (EWK-S, 2HDM) benchmark

 

5)  ATLAS/CMS objects/analysis strategies (M.Kagan, F. Micheli, C.Vernieri) [Thursday 1W (5:00-5:45)]

• Trigger strategies

• B-tagging and b-jets (regression)

• MET

 

6) How to improve WWbb (W off-shell) [S. Shrestha, N. De Filippis - Thursday 11 ROC ]

18:00 → 20:00 FERMILAB visit: Welcome Reception

list.pdf

MapsDZero.pdf

NuCamp.png

Wednesday 5 September

08:30 → 09:40 Theory

Convener: Javier Mazzitelli

08:30 Monte Carlo modelling of HH

Speaker: Eleni Vryonidou (CERN)

hhFermilab.pdf

09:00 Full NLO QCD corrections to ggF HH production

Speaker: Dr Julien Baglio (University of Tübingen)

baglio_hh_fermilab_2018.pdf

09:20 Reinterpretation of non-resonant HH searches

Speaker: Anamika Aggarwal (Nikhef National institute for subatomic physics (NL))

HH_FNAL-050918.pdf

09:40 → 10:45 Objects and tools: b-jets

Convener: Michael Aaron Kagan (SLAC National Accelerator Laboratory (US))

09:40 b-jet energy regression

Speaker: Alexander Melzer (University of Bonn (DE))

HHWS_bJetRegression.pdf

10:10 b-tagging : current and future performance

Speaker: Dr Luca Mastrolorenzo (Rheinisch Westfaelische Tech. Hoch. (DE))

Chicago_6_09_18_v2.pdf

10:45 → 11:00 Group picture

11:00 → 11:30 Coffee break

11:30 → 13:00 Experimental Signatures: H(bb)H(gammagamma)

Conveners: Francesco Micheli (Eidgenoessische Tech. Hochschule Zuerich (ETH)), James Robinson (Deutsches Elektronen-Synchrotron (DE))

11:30 ATLAS experimental summary

Speaker: Elizabeth Brost (Northern Illinois University (US))

HH_workshop_ATLAS_yybb.pdf

12:00 CMS experimental summary

Speaker: Maxime Gouzevitch (Centre National de la Recherche Scientifique (FR))

Fermilab_Gouzevitch_HHbbgg.pdf

12:30 Plans and perspectives for Run II and beyond

Speaker: David Delgove (Centre National de la Recherche Scientifique (FR))

HHWorkshop_DDelgove.pdf

13:00 → 14:00 Lunch break

14:00 → 16:00 Experimental Signatures: H(bb)H(bb)

Conveners: Caterina Vernieri (Fermi National Accelerator Lab. (US)), David Wardrope (University College London (UK))

14:00 b-tagging online, b-jet triggers and future plans

Speaker: John Alison (University of Chicago (US))

BJetTriggerStatusPlans.pdf

14:30 Identifying boosted H->bb

Speaker: Michael Aaron Kagan (SLAC National Accelerator Laboratory (US))

Kagan_BoostedH_2018.pdf

15:00 CMS Analysis Strategy, with focus on non-resonant

Speaker: Andres Tiko (Universita e INFN, Padova (IT))

slides_HH4b_Fermilab_tiko.pdf

15:30 ATLAS Analysis Strategy, with focus on non-resonant

Speaker: Jana Schaarschmidt (University of Washington (US))

ATLAS_4b_strategy.pdf

16:00 → 16:30 Coffee break

16:30 → 17:30 Discussion

1. ATLAS+CMS combination (Luca C., David W., Javier M.,  B. Di Micco) - Wednesday  Room Ramsey 

• based on 2015+2016 in preparation of the Run-2 legacy

• MC settings (NLO vs LO )

• Single H+HH combination

• Total cross section vs k_lambda + uncertainties

 

   2) How to make results public  (J. Allison, Max S., K. Leney) -  Friday 1W (17:30 - 18:30)

 

• Tools to provide unfolded UL

  • How to handle bbb correlations?

• Resonant: Gamma vs Mx plot?

  • How to reweight different widths?

• cut based results

• differential results in m_HH (truth vs. reco)

• Special care for BDT-based results

 

  3) EFT (S. Di Vita, M. Gouzevitch, J. Robinson) [17:30 - 18:30] 11th  floor ROC

• Which framework? More operators beyond O6

• How to make EFT useful for model testing?

• Which inputs from H and HH?

• Which topology? ggF/VBF single H background?

• Usage of shape benchmarks

 

4) BSM  (M. Carena, K. Tschann-Grimm, Ian Lewis, Lian-Tao Wang, X. Carvalho) Wednesday 11th floor ROC - Room One West

• Benchmark models : which one ?

  • Resonant: Is graviton still a good benchmark?

  • Interplay with VV

• Motivations for H1->H2 h

• Interference with SM HH (EWK-S, 2HDM) benchmark

 

5)  ATLAS/CMS objects/analysis strategies (M.Kagan, F. Micheli, C.Vernieri) [Thursday 1W (5:00-5:45)]

• Trigger strategies

• B-tagging and b-jets (regression)

• MET

 

6) How to improve WWbb (W off-shell) [S. Shrestha, N. De Filippis - Thursday 11 ROC ]

Thursday 6 September

09:00 → 10:30 Experimental Signatures: H(bb)H(tautau)

Conveners: Katharine Leney (University College London (UK)), Luca Cadamuro (University of Florida (US))

09:00 ATLAS analysis overview

Speaker: Alessandra Betti (University of Bonn (DE))

HHWorkshop_ATLASbbtautau_v3.pdf

09:30 CMS analysis overview

Speaker: Luca Cadamuro (University of Florida (US))

HH_CMS_bbtt_overview.pdf

10:00 Trigger strategies for bbtautau

Speaker: Agni Bethani (University of Manchester (GB))

HHatColliders_Agni_bbtautautriggers.pdf

10:30 → 11:00 Coffee break

11:00 → 12:20 Experimental Signatures: H(bb)H(tautau)

Conveners: Katharine Leney (University College London (UK)), Luca Cadamuro (University of Florida (US))

11:00 ATLAS and CMS overview + comparison of selections and fitted variables

Speaker: Arnaud Ferrari (Uppsala University (SE))

HH-Fermilab-AF.pdf

11:30 ATLAS and CMS overview + comparison of reconstruction and bkg estimation methods **remote**

Speaker: Francesco Brivio (Universita & INFN, Milano-Bicocca (IT))

FBrivio_bbtt_HH2018.pdf

12:00 Trigger strategies for VBF HHbbtt **remote**

Speaker: Chiara Amendola (LLR - Ecole Polytechnique (FR))

Amendola_DoubleHiggsLHC.pdf

12:20 → 13:00 Theory

Convener: Eleni Vryonidou (CERN)

12:20 Beyond the Standard Model HH production

Speaker: Ian Lewis (The University of Kansas)

IL_HH_FNAL.pdf

13:00 → 14:00 Lunch break

14:00 → 14:10 Fermilab director's welcome message

14:10 → 14:40 Theory

Convener: Eleni Vryonidou (CERN)

14:10 The least studied coupling in (double) Higgs physics

Speaker: Ian Low (Northwestern University)

HH_by_Low.pdf

14:40 → 16:00 Experimental Signatures: H(bb)H(VV)

Conveners: Dr Kuver Sinha (University of Oklahoma), Rami Kamalieddin (University of Nebraska Lincoln (US)), Suyog Shrestha (Ohio State University (US))

14:40 Theory talk specific to bbVV

Speakers: Dr Jeong Han Kim (University of Kansas), Dr Tathagata Ghosh (University of Hawaii)

Ghosh_bbWW_HH_Fermilab_2018.pdf

hh_Fermilab_bbWW_theory_Jeong_Han_Kim.pdf

15:10 ATLAS analysis overview: bbWW and bbZZ

Speaker: Gabriel Palacino (Indiana University (US))

hhWWVV_ATLAS_diHiggsWorkshop_20180906.pdf

15:40 Dedicated object reconstruction techniques for bbVV

Speaker: Jason Robert Veatch (Georg August Universitaet Goettingen (DE))

jveatch_hh_bbVV.pdf

16:00 → 16:30 Coffee break

16:30 → 17:00 Experimental Signatures: H(bb)H(VV)

Conveners: Dr Kuver Sinha (University of Oklahoma), Rami Kamalieddin (University of Nebraska Lincoln (US)), Suyog Shrestha (Ohio State University (US))

16:30 CMS analysis overview : bbZZ

Speaker: Apichart Hortiangtham (Northeastern University (US))

hh_LHC_workshop_2018_09_06_v5.pdf

16:45 CMS analysis overview : bbWW

Speaker: Tao Huang (Texas A & M University (US))

TaoHHbbWW_HHWorkshop_201809_v2.pdf

17:00 → 18:30 Discussion

1. ATLAS+CMS combination (Luca C., David W., Javier M.,  B. Di Micco) - Wednesday  Room Ramsey 

• based on 2015+2016 in preparation of the Run-2 legacy

• MC settings (NLO vs LO )

• Single H+HH combination

• Total cross section vs k_lambda + uncertainties

 

   2) How to make results public  (J. Allison, Max S., K. Leney) -  Friday 1W (17:30 - 18:30)

 

• Tools to provide unfolded UL

  • How to handle bbb correlations?

• Resonant: Gamma vs Mx plot?

  • How to reweight different widths?

• cut based results

• differential results in m_HH (truth vs. reco)

• Special care for BDT-based results

 

  3) EFT (S. Di Vita, M. Gouzevitch, J. Robinson) [17:30 - 18:30] 11th  floor ROC

• Which framework? More operators beyond O6

• How to make EFT useful for model testing?

• Which inputs from H and HH?

• Which topology? ggF/VBF single H background?

• Usage of shape benchmarks

 

4) BSM  (M. Carena, K. Tschann-Grimm, Ian Lewis, Lian-Tao Wang, X. Carvalho) Wednesday 11th floor ROC - Room One West

• Benchmark models : which one ?

  • Resonant: Is graviton still a good benchmark?

  • Interplay with VV

• Motivations for H1->H2 h

• Interference with SM HH (EWK-S, 2HDM) benchmark

 

5)  ATLAS/CMS objects/analysis strategies (M.Kagan, F. Micheli, C.Vernieri) [Thursday 1W (5:00-5:45)]

• Trigger strategies

• B-tagging and b-jets (regression)

• MET

 

6) How to improve WWbb (W off-shell) [S. Shrestha, N. De Filippis - Thursday 11 ROC ]

19:00 → 22:00 FERMILAB visit: Two Brothers Roundhousehttp://twobrothersbrewing.com/restaurants/roundhouse/

list.pdf

MapsDZero.pdf

NuCamp.png

Friday 7 September

09:00 → 10:00 Objects and tools: jets and boosted techniques

09:00 Substructure for HH signatures

Speaker: Marc Antoine Osherson (Rutgers, State Univ. of New Jersey (US))

HHsubstrc_Sep2018.pdf

09:30 Jet and MET performance

Speaker: Maximilian J Swiatlowski (University of Chicago (US))

jetmet.pdf

10:00 → 10:30 Theory

Convener: Ian Lewis (The University of Kansas)

10:00 Exotic decays in HH production

Speaker: Brian Thomas Batell (University of Pittsburgh)

Batell-FNAL-hh.pdf

10:30 → 11:00 Coffee break

11:00 → 11:30 Theory

Convener: Ian Lewis (The University of Kansas)

11:00 BSM multi Higgs

Speaker: Dr Nausheen Shah (Wayne State University)

THE Higgs and more Higgs: Making Sense out of Chaos

11:30 → 13:10 Experimental Signatures: Other signatures

Conveners: Christian Veelken (National Institute of Chemical Physics and Biophysics (EE)), Yaquan Fang (Chinese Academy of Sciences (CN))

11:30 The analysis of HH->WWgamma gamma with the ATLAS detector

Speaker: Maosen Zhou (Chinese Academy of Sciences (CN))

HH_WWyy_FNAL.pdf

11:50 HH->WW*WW* analysis with ATLAS detector

Speaker: Liang Li (Shanghai Jiao Tong University (CN))

HH4W_[DoubleHiggsWorkshop]_20180907.pdf

12:10 Reconstruction of the HH mass in the HH->4tau channel

Speaker: Christian Veelken (National Institute of Chemical Physics and Biophysics (EE))

svFit4tau_2018Sep07v1.pdf

12:30 The analysis of HH->4tau with the CMS detector

Speaker: Saswati Nandan (Saha Institute of Nuclear Physics (IN))

HHTo4tau.pdf

13:00 → 14:00 Lunch break

14:00 → 16:20 Experimental Signatures: Combination and other common topics

Conveners: Arnaud Ferrari (Uppsala University (SE)), Maxime Gouzevitch (Centre National de la Recherche Scientifique (FR))

14:15 Interferences in searches for heavy Higgs bosons

Speaker: Stefan Rainer Liebler (KIT - Karlsruhe Institute of Technology (DE))

Interference_Liebler.pdf

14:30 ggHH generation and benchmarks

Speakers: Alexandra Carvalho Antunes De Oliveira (Universita e INFN, Padova (IT)), Alexandra Carvalho Antunes De Oliveira (Universita e INFN, Padova (IT))

HH_LHC_WS_Sep2018.pdf

15:05 VBF HH generation and benchmarks

Speaker: Tyler James Burch (Northern Illinois University (US))

vbf_hh_burch2018_final.pdf

15:30 Interference effects in the alignement scenario

Speaker: Marcela Carena (Fermilab)

slides.pdf

15:30 → 17:30 Theory overview: Wine and Cheese

15:30 Wine&Cheese

16:00 Reflections on Double Higgs Production at the LHC

Speaker: Carlos E.M. Wagner (University of Chicago / Argonne National Laboratory)

Fermilab.WC.09.18.pdf

17:30 → 18:30 Discussion

Saturday 8 September

09:00 → 10:30 Summary

09:00 Experimental summary

Speaker: Caterina Vernieri (Fermi National Accelerator Lab. (US))

HH-workshop-experimentalsummary.pdf

09:45 Theory summary

Speaker: Brian Thomas Batell

Batell-HH-Theory-Summary.pdf

10:30 → 11:00 Coffee break

11:00 → 12:00 Theory: Discussion Summary, White Paper and Follow-Ups

11:00 Summary of discussion paper and white paper

Speaker: Biagio Di Micco (Universita' degli Studi di Roma Tre e Istituto Nazionale di Fisica Nucleare (INFN))

pres_discussione.pdf

12:00 → 13:00 Lunch break

13:00 → 17:00 FERMILAB visit

list.pdf

MapsDZero.pdf

NuCamp.png