LHC Higgs Cross Section Working Group 2 - Higgs Properties

Organization:

• Group meetings: WG2: Higgs Properties
• Mailing list: lhc-higgs-properties@cernNOSPAMPLEASE.ch
• git area : https://gitlab.cern.ch/LHCHIGGSXS/LHCHXSWG2
• Conveners: Daniele Barducci (INFN / Rome - Sapienza), Nicolas Berger (Annecy LAPP), Mauro Donega (ETH Zurich), Ken Mimasu (King’s College London)
• Previous conveners: Giuliano Panico (Firenze), Jorge de Blas (Granada), Predrag Milenovic (Belgrade), Marco Delmastro (Annecy), Francesco Riva (CERN), David Marzocca (Trieste), Mingshui Chen (Bejing), Chris Hays (Oxford), Adam Falkowski (Orsay-LPT), Gino Isidori (Zürich), Michael Dührssen (CERN) Andre David (CERN)

Topics:

• STXS & fiducial/differential XS
  • Recommendations for the fiducial and differential (Fid/DiffXS twiki) and simplified template cross sections (STXS) measurement and uncertainties computation.
  • Dedicated Fid./Diff./STXS twiki (with more details and contact emails).

• PO
  • Overview of effective POs and tools for extraction from measurements
  • Reweighting code to apply to existing MC
  • HiggsPO model available in Madgraph with NLO QCD corrections for VH/VBF production

• EFT
  • Tools: Implementation of Warsaw basis in FeynRules (available) with NLO QCD corrections in Madgraph (in development)
  • Validity (for discussion): defining the region of ci vs Lambda; square term gives an estimate of the uncertainty from higher powers of 1/Lambda
  • STXS->EFT mapping (available for HEL with SILH basis, in development for SMEFT with Warsaw)
  • Standard procedure for combined fit to Higgs+EW+Top data (for discussion, in coordination with other LHC Physics groups)
  • Initiative on establishing the EFT interpretation workflow guidelines/recommendations. A non-exhaustive list of aspects for discussion/clarification can be found here, together with google doc where anyone interested can sign-up for particular topics.

Roadmap

Topic	ShortDescription	Deliverables	Timescale	Notes	Status	Contact
STXS & differential XS	STXS stage 1.2 and TH uncertainties treatment recommendation	Note/journal (+ Rivet code?)	2020	To be ready in 2021	In Progress	Frank Tackmann
STXS & differential XS	STXS stage 1.2 binning recommendation	Note/arXiv/(journal) + Rivet code	Concluded	arXiv, to be updated with Stage 1.2	Definitions and Rivet routine done, documentation TBD	Frank Tackmann
STXS & differential XS	STXS decay-side binning definition	Note + Rivet code	2022	Draft note	Ongoing	Michael Dührssen-Debling
EFT	BSM Benchmarks and mapping to EFT. Determine benchmarks sensitive to differential and coupling measurements, define relevant EFT parameters	Note/arXiv	Early 2019	Ready	arXiv LHCHXSWG-2019-006	Francesco Riva David Marzocca
EFT	Interpretation Workflow Summary: Processes, Operators and BSM Interpretations	Note	2020-2021	Addendum to BSM Benchmarks note	Started	Jorge de Blas
EFT	Fit to STXS using a standardized mapping of STXS stage 1.2	Note/(arXiv)	Summer 2019	LHCHXSWG-2019-004	Concluded	Chris Hays
EFT	Global Fit in EFT Framework; inclusion of top and Electroweak measurements	Note	During 2021		In plan
EFT	High-Energy Higgs Probes: Longitudinal multiboson processes as tests of Higgs physics	Note	During 2021		Not started yet	Francesco Riva David Marzocca

PO presentation

Recent meetings:

Link to the dedicated indico category: WG2: Higgs Properties

• WG2 fid/diff/STXS meeting: ggH stage 1.2 uncertainties 04/11/2020
• Higgs measurements and their EFT interpretations 01/7/2020
• [STXS] Meeting on Updates to Uncertainties for Stage 1.2 25/06/2020
• EXP+TH LO/NLO EFT scheme discussion: 09/04/2020
• WG2-related plenary & discussion sessions in Oct 2019 general meeting 16/10/19
• STXS gg->H & ttH closure + diffXS variables discussion 16/9/19
• STXS discussion on ttH & ggH binning (for stage 1.2) 24/7/19
• STXS discussion at Les Houches 2019 12/6/19
• ttH STXS binning discussion 6/6/2019
• Joint VBF & fid/dif/STXS meeting: STXS qq→Hqq binning 17/1/19
• WG2 session in Dec 2018 general meeting 10/12/18
• WG2 fid/dif/STXS meeting: Presentation of results and STXS updates November 23
• CP and dimension-8 EFT November 13
• Validation and benchmarking of EFT tools June 14
• STXS meeting May 17
• WG2 session in March 2018 general meeting March 27
• Benchmark scenarios February 23 (2018)
• Winter meeting December 11 (2017)
• WG2 session in July 2017 general meeting July 14
• Joint EW+WG2 meeting July 10
• STXS meeting July 6
• Kickoff meeting May 8

Tools:

• EFT Interpretation Workflow Twiki page

• STXS & Differential XS
  • The STXS Rivet code
    • Classification : Rivet routines that assign STXS bin labels to a given MC event.

• PO
  • FeynRules implementation

• EFT
  • Mapping of the STXS to HEL parameters
  • FeynRules implementation of the Warsaw basis (SMEFTsim)

• κ coupling modifiers
  • Latest updates from Yellow Report 4

Past projects

• EFT approach to LHC Higgs searches
• Extension of the kappa formalism

Tools

• STXS.tgz: Revision 8941 of the STXS classification code