Higgs and Effective Field Theory - HEFT 2020

Europe/Zurich
Salón de Grados (Edificio Mecenas) (Universidad de Granada)

Salón de Grados (Edificio Mecenas)

Universidad de Granada

Dpto. Física Teórica y del Cosmos. Facultad de Ciencias, Universidad de Granada. Campus de Fuentenueva, 18071 Granada.
Adrian Carmona (UGR) , Mikael Chala (UGR) , Jose Santiago (Universidad de Granada (ES)) , Ilaria Brivio (University of Heidelberg) , Tyler Corbett (Bohr Institute) , Gauthier Durieux (Technion) , Michael Trott (University of Copenhagen (DK))
Description
Information about the discussion on the LHC EFT WG on Friday 2pm-5pm can be found on indico.cern.ch/event/908975 .

 

NEW: Due to the situation with covid-19, the workshop, as well as the subsequent discussion on the formation of an LHC EFT WG on Friday from 2pm-5pm ( https://docs.google.com/document/d/120Jp8BFqBFWgZcMoIZEl7SEpGcdA4-vX7WqE7-NSQp4/edit ) will be held via Vidyo. Please continue with the registration process. (Fee has been removed; previous payments will be refunded during the next days.)

HEFT is an annual workshop focusing on the use of effective field theories to search for physics beyond the Standard Model. A broad range of topics are encouraged, ranging from collider phenomenology and formal aspects to the latest experimental updates on dedicated searches. The meeting aims to foster discussions between theorists and phenomenologists from varied backgrounds as well as with experimental colleagues.

We would like to achieve a balance of senior and junior speakers, enhancing the visibility of younger scientists while keeping some overview talks.

This year's edition is organized by (and will be held in) the Dpto. Física Teórica y del Cosmos of the Universidad de Granada.

The workshop will begin on April 15th morning and end after lunch on April 17th.

Confirmed speakers:

      - Rodrigo Alonso

      - Shankha Banerjee

      - Stefan Bissmann

      - Laura Barranco

      - Jorge de Blas

      - Juan Carlos Criado

      - Céline Degrande

      - Javier Fuentes-Martin

      - Alexander Grohsjean

      - Pier Paolo Giardino

      - Rick Gupta

      - Brian Henning

      - Andreas Helset

      - Claudius Krause

      - Camila Machado

      - Adam Martin

      - Ken Mimasu

      - Maria Moreno Llacer

      - Manuel Pérez-Victoria

      - Ben Pecjak

      - Sophie Renner

      - Marc Riembau

      - Juan Jose Sanz Cillero

      - Javi Serra

      - Yael Shadmi

      - Dave Sutherland

      - Jorge Terol Calvo

      - Roberto Vega-Morales

      - Javier Virto

      - Eleni Vryonidou

      - Pham Ngoc Hoa Vuong

Participants
  • Abdelhak Djouadi
  • Adam Martin
  • Adrian Carmona Bermudez
  • Alexander Josef Grohsjean
  • Alexandre Salas-Bernárdez
  • Andreas Helset
  • Antonio Pich
  • Arsenii Titov
  • Ben Pecjak
  • Benjamin Fuks
  • Brian Henning
  • Camila Machado
  • Carlos Quezada Calonge
  • Celine Degrande
  • Christophe Grojean
  • Claude Charlot
  • Claudius Krause
  • Dave Sutherland
  • Eleni Vryonidou
  • Felipe J Llanes-Estrada
  • Florian Goertz
  • Francisco del Aguila
  • Gauthier Durieux
  • Guilherme Guedes
  • Hesham El Faham
  • Ignasi Rosell
  • Ilaria Brivio
  • Jacob Ethier
  • Javi Serra
  • Javier Fuentes-Martin
  • Javier Martinez Lizana
  • Javier Virto
  • Jeremie Quevillon
  • Jim Talbert
  • Joey Reiness
  • Jorge de Blas
  • Jorge Terol Calvo
  • Jose Santiago
  • Juan Carlos Criado
  • Juan José Sanz-Cillero
  • Juan Rojo
  • Ken Mimasu
  • Khawla Jaffel
  • Laura Barranco Navarro
  • Laura Reina
  • Luca Merlo
  • Manuel Perez-Victoria
  • Marc Riembau
  • Maria Moreno Llacer
  • Maria Ramos
  • Martti Raidal
  • Michelangelo Mangano
  • Mikael Chala
  • Mike Trott
  • Mustafa Ashry
  • Neil Warrack
  • Oleksandr Tomalak
  • Pawel Kozow
  • Pham Ngoc Hoa Vuong
  • Pier Paolo Giardino
  • Rafael Aoude
  • Rafael Delgado Lopez
  • Rick Gupta
  • Roberto A. Morales
  • Roberto Vega-Morales
  • Rodrigo Alonso
  • Sally Dawson
  • Shankha Banerjee
  • Sophie Renner
  • Stefan Bißmann
  • Tyler Corbett
  • Yael Shadmi
  • Zhengkang Zhang
    • 1
      Welcome
    • 2
      Top-Higgs interplay

      The top Yukawa coupling can be probed using different physics process at the LHC (ttH, tH, 4-tops, etc.). The latest results on this together with global interpretations with other top (or Higgs) processes will be presented.

      Speaker: Dr Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))
    • 3
      Top quark electroweak interactions at high energy
      Speaker: Ken Mimasu (Université Catholique de Louvain)
    • 4
      Top-Higgs in the EFT: towards a global interpretation
      Speaker: Eleni Vryonidou (CERN)
    • 11:00 AM
      Coffe break
    • 5
      SMEFT at NLO
      Speaker: Celine Catherine A Degrande
    • 6
      Resonance Lagrangians and HEFT

      Some results on the contribution from resonances to the HEFT low-energy couplings up to NLO are discussed in this talk

      Speaker: Juan José Sanz-Cillero (Universidad Complutense de Madrid)
    • 7
      EWPO in the SMEFT at NLO
      Speaker: Pier Paolo Giardino (IFT)
    • 1:00 PM
      Lunch break
    • 8
      Constraining the Higgs-gauge couplings through differential SMEFT analyses

      In this talk, I will focus on the measurements of the Higgs couplings to the electroweak bosons, in the context of an effective field theory. I will also discuss the possibility of strongly constraining the couplings affecting the charged triple gauge boson vertices upon studying the Zh and Wh channels in the boosted Higgs regime. Finally, I will discuss the prospects of disentangling the various tensor structures in the hZZ/hWW vertices upon considering the full analytical structure of the Zh/Wh production and using the full angular information to resurrect the interference terms, using the method of moments technique. The various angular structures will thus be utilised differentially in order to maximise sensitivity to such anomalous couplings.

      Speaker: Shankha Banerjee (University of Durham (GB))
    • 9
      SMEFT anomalous dimensions from the S-matrix
      Speaker: Marc Riembau (Université de Genève)
    • 10
      The dimension-8 SMEFT for Higgs and electroweak physics

      In this talk I will discuss how dimension 8 effects can be systematically studied in Higgs and electroweak physics. After presenting a full list of dimension 8 operators that correct these processes, we will discuss how they connect to observables. The effects from these operators can be classified into two categories, (1) those arising from new contributions to vertex structures already present in the dimension-6 lagrangian and (2) those arising from completely new vertex structures that can lead to novel kinematical signatures or final states. We will focus on the former category, i.e. pseudo-observables that can get contributions from both dimension-6 and 8 operators, where it is especially hard to disentangle the dimension 8 contribution form the dominant dimension 6 one. To isolate such dimension-8 effects, we need to test correlations between pseudo-observables that exist at the dimension-6 level. Dimension 8 effects arise as a violation of these correlations. We provide some examples about how well these correlation violations can be measured and how these can translate into bounds on dimension-8 operators.

      Speaker: Sandeepan Gupta (IPPP, Durham University)
    • 4:00 PM
      Coffee break
    • 11
      The Geometric SMEFT
      Speaker: Adam Martin (Fermilab)
    • 12
      Ward Identities for the Standard Model Effective Field Theory

      We derive Ward identities for the standard model effective field theory using the background-field method. The resulting symmetry constraints on the standard model effective field theory are basis independent, and constrain the perturbative and power-counting expansions. A geometric description of the field connections, and real representations for the SU(2)L×U(1)Y generators, underlies the derivation.

      Speaker: Andreas Helset (Niels Bohr Institute)
    • 13
      A momentum representation for loop computations in Gravity

      We extend the covariant derivative expansion (CDE) to gravity.

      Speaker: Rodrigo Alonso De Pablo (University of Durham (GB))
    • 14
      Low-energy EFT of spontaneously broken BSM theories
      Speaker: Manuel Maria Perez-Victoria Moreno De Barreda (Universidad de Granada (ES))
    • 15
      The Higgs EFT is a black hole

      We consider the question of whether the scalar sector of the Standard Model, and possible deviations from its predicted interactions, are best parametrised by "SMEFT" or "HEFT". Here "SMEFT" means an effective field theory built out of a Higgs doublet, whose components transform linearly under electroweak symmetries; "HEFT" is built out of a singlet Higgs field and three Goldstones upon which symmetry transformations are non-linearly realised. Ultimately, they are just different coordinate choices for a scalar field space manifold. Drawing heavily on the recent literature, we formulate field redefinition invariant (i.e. geometric) criteria on the analyticity and convergence of the lagrangian, to understand when one must and should use a "HEFT" to parametrise the effects of new physics.

      Speaker: Dave Sutherland
    • 16
      New results about the "Universal One Loop Effective Action"

      I will present new results about the UOLEA which now allow to consider EFTs for which heavy fermions (vector like and chiral) have been integrated out.

      Speaker: Hoa Vuong
    • 11:00 AM
      Coffee break
    • 17
      EFT of Gravity to All Orders
      Speaker: Javi Serra
    • 18
      EFTs and On-shell Amplitudes
      Speaker: Camila Sampaio Machado (UNESP - Universidade Estadual Paulista (BR))
    • 19
      Electroweak interactions & beyond: on-shell & bottom up
      Speaker: Yael Shadmi (Technion)
    • 1:00 PM
      Lunch break
    • 20
      EFT interpretation of measurements in the top quark sector from ATLAS experiment
      Speaker: Laura Barranco Navarro (Stockholm University (SE))
    • 21
      Charm Physics Confronts High-pT Lepton Tails

      I present a phenomenological investigation of possible short-distance new physics in (semi)leptonic charmed-meson decays. Using the Standard Model effective field theory, we demonstrate the complementarity with the production of high-pT leptons at the LHC. Our combined analysis of the latest low- and high-energy experimental data shows that much of the room for new physics in charm decays is challenged by the LHC high-pT data.

      Speaker: Javier Fuentes-Martin (University of Zurich)
    • 22
      Effective Higgs couplings and CP properties in the golden channel
      Speaker: Roberto Vega-Morales
    • 4:00 PM
      Coffee break
    • 23
      Computer tools for EFTs
      Speaker: Juan Carlos Criado Álamo (University of Granada)
    • 24
      Operators, amplitudes, states, and all that
      Speaker: Brian Henning (U)
    • 25
      Higgs-Electroweak Chiral Lagrangian: One-Loop Renormalization Group Equations
      Speaker: Claudius Krause (Fermilab)
    • 26
      Higgs decay to fermions at NLO in SMEFT
      Speaker: Benjamin Pecjak (Durham University)
    • 27
      The CKM parameters in the SMEFT
      Speaker: Javier Virto (Universitat de Barcelona)
    • 28
      Flavour constraints on the flavourless SMEFT
      Speaker: Sophie Renner (CERN)
    • 29
      High-energy constraints from low-energy neutrino non-standard interactions

      Many scenarios of new physics predict the existence of neutrino Non-Standard Interactions, new vector contact interactions between neutrinos and first generation fermions beyond the Standard Model. In this talk we will present model-independent constraints on the Standard Model Effective Field Theory at high energies from bounds on neutrino non-standard interactions derived at low energies. Our analysis explores a large set of new physics scenarios and includes full one-loop running effects below and above the electroweak scale. Our results show that neutrino non-standard interactions already push the scale of new physics beyond the TeV. We also conclude that bounds derived by other experimental probes, in particular by low-energy precision measurements and by charged lepton flavor violation searches, are generally more stringent.

      Speaker: Jorge Terol Calvo (IFIC (CSIC-Univ València))
    • 11:00 AM
      Coffee break
    • 30
      Probing the SMEFT at CMS
      Speaker: Alexander Josef Grohsjean (Deutsches Elektronen-Synchrotron (DE))
    • 31
      Correlating uncertainties within the SMEFT

      We investigate the impact of correlations between (theoretical and experimental) uncertainties on multi-experiment, multi-observable analyses within the Standard Model Effective Field Theory (SMEFT). To do so, we perform a model-independent analysis of t-channel single top-quark production and top-quark decay data from ATLAS, CMS, CDF and D0. We show quantitatively how the fit changes when different experimental or theoretical correlations are assumed. Assuming no correlations returns a fit in agreement with the Standard Model while a 'best guess'-ansatz taking into account correlations would show deviations from the SM. At the same time, modelling the impact of higher order SMEFT-corrections the latter turn out to be a subleading source of uncertainty only.

      Speaker: Stefan Bißmann
    • 32
      Precision constraints on non-standard EW/Higgs couplings with HEPfit

      In this talk I present the HEPfit code, a flexible open-source tool to perform statistical tests of the Standard Model or any of its extensions. I will focus the talk on the current capabilities of the code for studies of the electroweak and Higgs sectors. As an example of such capabilities, we consider the case of physics beyond the SM parameterized by the dimension-6 SMEFT, and derive bounds on new physics using current data as well as projections at future particle colliders.

      Speaker: Jorge de Blas (University of New Hampshire (US))
    • 1:00 PM
      Lunch break
    • 33
      LHC EFT Working Group Meeting
      Speakers: Jose Santiago (Universidad de Granada (ES)) , Michelangelo Mangano (CERN)