6th General Meeting of the LHC EFT Working Group

15 Nov 2023, 14:00 → 17 Nov 2023, 18:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

General meeting of the LHC EFT Working Group 

There will be a joint session with LHC Higgs WG during their 20th annual workshop on Wednesday afternoon. The corresponding Zoom link is https://cern.zoom.us/j/65534194643?pwd=OHcrOThZdVdRdHBDWklGeTRxK0dZZz09 for this session.

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Wednesday 15 November

14:00 → 15:30 Area reports: Joint session with LHC Higgs WG (https://indico.cern.ch/event/1276727/sessions/508583/#20231115) ACHTUNG: SEPARATE ZOOM: https://cern.zoom.us/j/65534194643?pwd=OHcrOThZdVdRdHBDWklGeTRxK0dZZz09

18:30 → 20:00 Refreshments

Thursday 16 November

09:40 → 11:10 Experimental reports

09:40 SMEFT in the EWK and TOP sectors in CMS (20'+10')

Speaker: Andrea Piccinelli (University of Notre Dame (US))

LHCEFT_6thWG_CMS_TopEwk.pdf

Recording

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10:10 SMEFT in the EWK sector in ATLAS (10'+5')

Speaker: José Antonio Fernández Pretel (Albert Ludwigs Universitaet Freiburg (DE))

lcheftwg161123.pdf

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10:25 SMEFT in the TOP sector in ATLAS (10'+5')

Speaker: Jacob Julian Kempster (University of Sussex (GB))

JKempster_LHCEFTWG_SMEFTTopATLAS_161123.pdf

Recording

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10:40 → 11:10 coffee break

11:10 → 11:40 Experimental reports

11:10 EFT in flavor and B-physics in ATLAS, CMS and LHCb (20'+10')

Speakers: Guy Henri Maurice Wormser (Université Paris-Saclay (FR)), Guy Wormser (LAL Orsay)

EFT2023_wormser.pdf

EFT2023_wormser.pptx

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11:40 → 13:10 Theory reports

11:40 Progress in the SMEFT-UV connection (20'+10')

Speaker: Dr SUPRATIM DAS BAKSHI (Granada University)

Bakshi_EFTWG5.pdf

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12:10 Formal developments in EFTs (20'+10')

Speaker: Andreas Helset (CERN)

EFTWG2023_Helset.pdf

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12:40 Developments in SMEFT phenomenology (20'+10')

Speaker: Alejo Nahuel Rossia (University of Manchester)

Recording

Rossia_CERN_Nov23_PDF.pdf

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13:10 → 14:20 Lunch break

14:20 → 15:40 Area reports: Fit and related systematics - Area 4

14:20 Area 4: Update on EFTWG fitting exercise (10'+5')

Speaker: Kristin Lohwasser (University of Sheffield (GB))

Recording

UpdateGlobalEFTFit.pdf

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14:35 Area 4: Report on LHC reinterpretation forum workshop (10'+5')

Speaker: Ken Mimasu (University of Southampton)

Recording

Report on LHC reinterpretation forum workshop .pdf

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14:50 Area 4: A practical framework of EFT fits with published likelihoods (20'+5')

Recently there has been rapid increase in the number of full statistical models (or "likelihoods") published by the experiments. Most are based on the HistFactory (pyhf) format and published in HEPData. This allows theorists and others to reproduce and combine measurements with the same gold standard as the internal experimental results. However, these are mainly from SUSY and exotics searches and working with EFTs is more complicated because quantum interference effects lead to changes in the signal template (via the dependence of the differential cross-sections and phase-space dependent selection efficiency on the EFT parameters). In this talk I will propose a simple, lightweight framework that would extend current likelihood publishing to overcome these challenges and enable 'exact' EFT fits (i.e. with the same level of detail as the internal experimental fits and combinations).

Speaker: Kyle Stuart Cranmer (University of Wisconsin Madison (US))

LHC-EFT-WG-2023.pdf

Recording

Related work: custom EFT reweighting extension to pyhf for Belle II analysis.

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15:15 Area 4: Introducing the FAIROS-HEP Research Coordination Network (5'+5')

The US National Science Foundation has funded a 3-year "Research Coordination Network" called FAIROS-HEP. FAIROS-HEP aims to foster the adoption of practices and cyberinfrastructure to enable reuse and reinterpretation of high energy physics (HEP) datasets. The network has funds to support international workshops and to contribute directly to cyberinfrastructure components such as INSPIRE, HEPData, etc. A specific aim of FAIROS-HEP is to aid in developing a framework for EFT global fits as conceptualized by the community through meetings such as the LHC EFT WG. The purpose of this talk is just to announce the project and the availability of funds for participants to attend dedicated workshops and targeted contributions to cyberinfrastructure components.

Speaker: Kyle Stuart Cranmer (University of Wisconsin Madison (US))

2023-11-16-FAIROS-LHC-EFT-WG.pdf

15:25 Area 4: Plans & Discussion

15:40 → 16:10 Break

16:10 → 17:50 Area reports: Observables - Area 3

16:10 Machine Learning opportunities for EFT analyses

Speaker: Maeve Madigan (Heidelberg University)

EFTWG.pdf

Recording

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16:50 Computing optimal observables from the Matrix Element Method with Conditional Normalizing Flows

Speaker: Davide Valsecchi (ETH Zurich (CH))

23_11_16 - LHCEFTWG - MEMFlow for EFT.pdf

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17:05 Quantum Computing and Quantum information in estimating EFTs from measurements

Speaker: Vincent Alexander Croft (Nikhef National institute for subatomic physics (NL))

LHCEFT6.pdf

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17:20 Public repository for limits on SMEFT Wilson coefficients

Speaker: Dr SUPRATIM DAS BAKSHI (Granada University)

Bakshi_smeftbounds_EFTWG5.pdf

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17:35 Roadmap towards future combinations and Effective Field Theory interpretations of top+X processes

Speaker: Jacob Julian Kempster (University of Sussex (GB))

JKempster_LHCEFTWG_Run3TopXStratDoc_161123.pdf

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Friday 17 November

09:00 → 10:10 Area reports: Predictions & Tools - Area 2

09:00 Area 2: Update on EFT prediction note

Speaker: Alberto Belvedere (Deutsches Elektronen-Synchrotron (DE))

LHC_EFT_prediction_note.pdf

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09:20 Area 2: Update on common format & toolchain for SMEFT parameterisations (STXS)

Speakers: Eleonora Rossi (University of Oxford (GB)), Ken Mimasu (University of Southampton)

example.json

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STXS param.pdf

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09:40 SmeftFR v3 - a tool for creating and handling vertices in SMEFT to the 1/Λ^4 order

SmeftFR v3 [Comput.Phys.Commun. 294 (2024) 108943, 2302.01353, https://www.fuw.edu.pl/smeft/] enables derivation of Feynman rules for interaction vertices from the dimension-5, dimension-6, and (so far) all bosonic dimension-8 SMEFT operators. Obtained Feynman rules allow for consistent numerical or symbolic calculations in SMEFT (e.g., in Madgraph or in FeynArts) to the 1/Λ^4 order in the EFT expansion, including dimension-6 squared and dimension-8 terms, which is a novelty in the literature. In my talk, I will discuss some of the most important new features of SmeftFR v3, such as choosing among and using one of the predetermined input schemes, including one for the CKM matrix. I will also describe examples of its usage and some possible applications.

Speaker: Michal Ryczkowski

Recording

RyczkowskiLHCWG.pdf

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10:10 → 10:40 coffee break

10:40 → 12:00 Area reports: Benchmark Scenarios from UV Models - Area 5

Conveners: Peter Stangl (CERN), Sandra Kortner (Max Planck Society (DE)), Shankha Banerjee

10:40 Summary of Area 5 activities and new directions

Speaker: Peter Stangl (CERN)

Recording

Stangl_23-11_EFTWG.pdf

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10:55 Matching 2HDM onto Effective Field Theories in ATLAS (15' + 5')

Speaker: Andrea Visibile (Nikhef National institute for subatomic physics (NL))

Recording

SMEFT_to_UV_EFT_WG_general.pdf

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11:15 Matching database + new framework for matching repository (20' + 5')

Speaker: Juan Carlos Criado (University of Granada)

matchingdb.pdf

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11:40 One Loop Effective Action up to Dimension Eight: integrating out heavy scalars and fermions (15' + 5')

I will discuss the computation of effective action after integrating out heavy scalars and fermions respectively up to dimension eight. The result is very universal. The generic expressions for the effective operators up to dimension eight are computed for the first time and applicable for any UV model. At this current situation when we are looking more precise calculation beyond dimension six, these will be very useful and effective.

Speaker: Joydeep Chakrabortty (IIT Kanpur)

EFTWG_CERN_17Nov.pdf

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12:00 → 13:20 Lunch break

13:20 → 14:50 Area reports: EFT formalism - Area 1

13:20 Higher-order corrections in SMEFT (20'+5')

Speaker: Anke Biekoetter (JGU Mainz)

EFTWG_Biekoetter.pdf

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13:45 Positivity constraints (20'+5')

Speaker: Mr Marc Riembau Saperas (CERN)

2311_EFTWG.pdf

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14:10 SMEFT vs HEFT: multi-Higgs phenomenology (15'+5')

This article studies the production of multiple Higgs bosons from longitudinal vector boson scattering in the context of effective field theories.
The equivalence theorem is employed for a clearer understanding of the $WW\to n\times h$ dynamics.
In this approximation, the Higgs dynamics is determined at lowest order in the general Higgs Effective Theory (HEFT) by the flare function $\mathcal{F}$, which provides the $WWh^n$ effective vertices.
We find that the amplitudes can be written in a very compact way for the production of two, three and four Higgs bosons.
However, when mapped to the Standard Model Effective Theory (SMEFT), we find a strong suppression in the production of multi-Higgs states.
Non-SMEFT scenarios that allow the flare-function to deviate from the correlations required by SMEFT can avoid this feature and have cross sections orders of magnitude larger.
We provide some phenomenological comparisons between HEFT and SMEFT cross sections and exclusion plots for models assuming the SMEFT scenario. For the computation of these cross sections we provide various specific codes which we have made publicly available to the community.

Speaker: Javier Martínez Martín (Universidad Complutense de Madrid & IPARCOS)

Production_of_two_three_and_four_Higgs_bosons

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14:30 Geometry of EFTs (15'+5')

Lagrangian terms of an effective field theory (EFT) are commonly organized as an expansion in terms of the EFT power counting. Field space geometry reorganizes these terms in a more efficient way, allowing the direct generalization of some known results to a resummed tower of operators containing higher-order terms, such as the renormalization group equations at one- and two-loop order, some scattering amplitudes, decay widths and electroweak precision observables.This geometric approach also gives a basis independent formulation which can be interpreted with different EFT power counting parameters, helping us select the most appropriate EFT (with faster convergence) for phenomenology studies, such as the Standard Model EFT vs the Higgs EFT.
The purpose of this proposal to the LHC EFT working group is twofold:
1) Fully generalize the formalism to arbitrary EFTs by including derivative terms and particles of higher-spin (fermions and vectors). Ideas to deal with the former include Lagrange spaces and jet bundle geometry, while the latter is straightforward and requires an extension of the field space to supermanifolds.
2) Facilitate the adoption of these techniques in phenomenology studies, allowing to deal with more compact expressions in terms of the geometrical objects, which makes the calculations with higher-dimensional operators trivial.

Speakers: Julie Pagès, Julie Pagès (University of California, San Diego)

GeometryofEFTs_LHCEFTWG2023.pdf

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14:50 → 16:05 Area reports: Area reports - Area 6

14:50 Closing in on New Physics via the Flavor, Collider, and Electroweak Triad (15+5)

Speaker: Ben Stefanek

Recording

stefanek_eftwg_2023_HQ.pdf

stefanek_eftwg_2023.pdf

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15:10 Effective couplings in $B^0\to K^{*0}\mu^+\mu^-$ (15+5)

Speaker: Rafael Silva Coutinho (Syracuse University (US))

Recording

Talk_RSilvaCoutinho.pdf

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15:30 Workshop summary: Heavy flavour aspects in EFT - SL decays (10+5)

Speaker: Biljana Mitreska (Technische Universitaet Dortmund (DE))

LHC_EFT_summary_Mitreska_17112023.pdf

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15:45 Leading directions in SMEFT (15+5)

Speaker: Ajdin Palavric (University of Basel)

[LHC EFT Working Group] Ajdin Palavric.pdf

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