Higgs and Effective Field Theory - HEFT 2020

15 Apr 2020, 09:00 → 17 Apr 2020, 17:00 Europe/Zurich

Salón de Grados (Edificio Mecenas) (Universidad de 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))

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

Wednesday, 15 April

09:15 → 09:30 Welcome

HEFT2020.pdf

09:30 → 10:00 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))

MariaMorenoLlacer_TopQuarkAndHiggsInterplay_April2020.pdf

10:00 → 10:30 Top quark electroweak interactions at high energy

Speaker: Ken Mimasu (Université Catholique de Louvain)

Mimasu_HEFT_nobuild.pdf

Mimasu_HEFT.pdf

10:30 → 11:00 Top-Higgs in the EFT: towards a global interpretation

Speaker: Eleni Vryonidou (CERN)

Top-Higgs-heft.pdf

11:00 → 11:30 Coffe break

11:30 → 12:00 SMEFT at NLO

Speaker: Celine Catherine A Degrande

HEFT20EFTNLO.pdf

12:00 → 12:30 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)

Sanz-Cillero-v0_HEFT2020.pdf

Sanz-Cillero-v0_HEFT2020.pptx

12:30 → 13:00 EWPO in the SMEFT at NLO

Speaker: Pier Paolo Giardino (IFT)

Giardino.pdf

13:00 → 14:30 Lunch break

14:30 → 15:00 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))

HEFT_Banerjee.pdf

15:00 → 15:30 SMEFT anomalous dimensions from the S-matrix

Speaker: Marc Riembau (Université de Genève)

2004_HEFT_riembau.pdf

15:30 → 16:00 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)

heft2020.pdf

16:00 → 16:30 Coffee break

16:30 → 17:00 The Geometric SMEFT

Speaker: Adam Martin (Fermilab)

HEFT_AMartin.pdf

17:00 → 17:30 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)

slides_HEFT2020_Helset.pdf

17:30 → 18:00 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))

CDEGR.pdf

Thursday, 16 April

09:30 → 10:00 Low-energy EFT of spontaneously broken BSM theories

Speaker: Manuel Maria Perez-Victoria Moreno De Barreda (Universidad de Granada (ES))

HEFT2020_MPV.pdf

10:00 → 10:30 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

Sutherland_HEFT2020.pdf

10:30 → 11:00 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

UOLEA_HEFT_Talk_2020.pdf

11:00 → 11:30 Coffee break

11:30 → 12:00 EFT of Gravity to All Orders

Speaker: Javi Serra

JSerra_HEFT20_c.pdf

12:00 → 12:30 EFTs and On-shell Amplitudes

Speaker: Camila Sampaio Machado (UNESP - Universidade Estadual Paulista (BR))

HEFT_2020_CSMachado.pdf

12:30 → 13:00 Electroweak interactions & beyond: on-shell & bottom up

Speaker: Yael Shadmi (Technion)

shadmi-heft20.pdf

13:00 → 14:30 Lunch break

14:30 → 15:00 EFT interpretation of measurements in the top quark sector from ATLAS experiment

Speaker: Laura Barranco Navarro (Stockholm University (SE))

LBarrancoHEFTworkshop.pdf

15:00 → 15:30 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)

fuentes_HEFT_2020.pdf

15:30 → 16:00 Effective Higgs couplings and CP properties in the golden channel

Speaker: Roberto Vega-Morales

HEFT2020_RVM.pdf

16:00 → 16:30 Coffee break

16:30 → 17:00 Computer tools for EFTs

Speaker: Juan Carlos Criado Álamo (University of Granada)

jccriado_heft2020.pdf

17:00 → 17:30 Operators, amplitudes, states, and all that

Speaker: Brian Henning (U)

Henning_heft2020.pdf

17:30 → 18:00 Higgs-Electroweak Chiral Lagrangian: One-Loop Renormalization Group Equations

Speaker: Claudius Krause (Fermilab)

HEFT2020.C.Krause.pdf

Friday, 17 April

09:00 → 09:30 Higgs decay to fermions at NLO in SMEFT

Speaker: Benjamin Pecjak (Durham University)

HEFT2020.pdf

09:30 → 10:00 The CKM parameters in the SMEFT

Speaker: Javier Virto (Universitat de Barcelona)

HEFT2020.pdf

10:00 → 10:30 Flavour constraints on the flavourless SMEFT

Speaker: Sophie Renner (CERN)

RennerHEFTpdf.pdf

10:30 → 11:00 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))

HighEnergyConstraints.pdf

11:00 → 11:30 Coffee break

11:30 → 12:00 Probing the SMEFT at CMS

Speaker: Alexander Josef Grohsjean (Deutsches Elektronen-Synchrotron (DE))

agrohsje_cmstopeft_heft2020.pdf

12:00 → 12:30 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

HEFT20_Bissmann.pdf

12:30 → 13:00 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))

Precision_EW_H_HEPfit_deBlas.pdf

13:00 → 14:00 Lunch break

14:00 → 17:00 LHC EFT Working Group Meeting

Speakers: Jose Santiago (Universidad de Granada (ES)), Michelangelo Mangano (CERN)

Discussion indico page