Dublin 2020 - EuroPLEx progress workshop

Europe/Dublin
Gert Aarts (Swansea University), Mike Peardon, Petros Dimopoulos (University of Parma), Stefan Sint (Trinity College Dublin (IE))
Description

This online workshop is organized by the EU funded European network for Particle physics, Lattice field theory and Extreme computing (EuroPLEX  cf. http://europlex.unipr.it/).  Besides status reports by the EuroPLEX working groups, the programme will contain several topical talks, as well as both introductory and advanced talks on scale setting in QCD, the inclusion of electromagnetism, the QCD phase diagram and lattice determinations of the strong coupling. Originally planned as a physical meeting in Dublin, the event will now take place online via zoom. Access is given to registered participants only, registration is free of charge.

Confirmed speakers:

  • Luigi Del Debbio (U. Edinburgh)
  • Tomasz Korzec  (U. Wuppertal)
  • Ernesto Lozano (Investigación y Ciencia)
  • Agostino Patella (Humboldt U., Berlin)
  • Alberto Ramos (IFIC Valencia)
  • Claudia Ratti  (U. Houston)
  • Phiala Shanahan (MIT)
  • Nazario Tantalo (Rome 2)
  • Davide Vadacchino (Trinity College Dublin)
  • Lukas Varnhorst  (Marseille)
  • Philipp Wein (U. Regensburg)

 

(Non-)Local organizing committee:

  • Gert Aarts
  • Nico Battelli
  • Lucius Bushnaq
  • Pietro Butti
  • Leonardo Chimirri
  • Alessandro Conigli
  • Petros Dimopoulos
  • Francesco Di Renzo
  • Mike Peardon
  • Stefan Sint
  • Davide Vadacchino

 

 

Participants
  • Agostino Patella
  • Ahmed Bakry
  • ALEJANDRO SAEZ GONZALVO
  • Alessandro Conigli
  • Alessandro Lupo
  • Alfio Lazzaro
  • Andreas Risch
  • Anna Ritz-Zwilling
  • Anthony Francis
  • Antonin Portelli
  • Antonio Smecca
  • Archana Radhakrishnan
  • Artan Borici
  • Benjamin Jaeger
  • Benjamin Page
  • Benjamin Svetitsky
  • Bernd Riederer
  • Biagio Lucini
  • Björn Leder
  • Carlos Pena
  • Chris Allton
  • Chris Sachrajda
  • Christian Schmidt
  • Claudia Ratti
  • Claudio Pica
  • Dale Lawlor
  • Daniel Jenkins
  • David Albandea Jordán
  • David Mason
  • David Schaich
  • Davide Giusti
  • Davide Vadacchino
  • Dimitrios Bachtis
  • Dmitri Grigoriev
  • Don V Black, PhD
  • Elizabeth Dobson
  • Emil Leeb-Lundberg
  • En-Hung Chao
  • Enrico Fiorenza
  • Ernesto Lozano Tellechea
  • Fabian Joswig
  • Felipe Attanasio
  • Felix Erben
  • Felix Ziegler
  • Francesco Di Renzo
  • Francesco Knechtli
  • Gabriel Bliard
  • Gert Aarts
  • Giancarlo Rossi
  • Giuseppe Burgio
  • Gregorio Herdoiza
  • Guido Nicotra
  • Guilherme Catumba
  • Gunnar Bali
  • Hai-Tao Shu
  • Jack Holligan
  • James Simone
  • Jana Guenther
  • Jens Lücke
  • Jeremy Green
  • Jochen Heitger
  • Johan Messchendorp
  • Jon-Ivar Skullerud
  • Jorge Juan Baeza Ballesteros
  • Jorge Luis Dasilva Golán
  • Julian Urban
  • Kevin Zambello
  • Laurence Cooper
  • Leonardo Chimirri
  • Letizia Parato
  • Lorenzo Barca
  • Luca Griguolo
  • Lucius Bushnaq
  • Lukas Varnhorst
  • Luke Gayer
  • Marco Garofalo
  • Marco Panero
  • Margarita Garcia Perez
  • Marina Krstic Marinkovic
  • Marisa Bonini
  • Matthew Wingate
  • Mattia Dalla Brida
  • Maurizio Piai
  • Maxim Chernodub
  • Maxwell Hansen
  • Michael Peardon
  • Mitja Šadl
  • Mostafa Khalil
  • Mugdha Sarkar
  • Nazario Tantalo
  • Nelson Lachini
  • Nico Battelli
  • Nicolas Lang
  • Nils Hermansson-Truedsson
  • Olaf Kaczmarek
  • Oliver Baer
  • Orlando Oliveira
  • Paolo Baglioni
  • paolo stornati
  • Patrick Fritzsch
  • Paulo Silva
  • Peter Petreczky
  • Petros Dimopoulos
  • Phiala Shanahan
  • Philipp Wein
  • Pia Leonie Jones Petrak
  • Pietro Butti
  • Rainer Sommer
  • Rajnandini Mukherjee
  • Roger Horsley
  • Roman Höllwieser
  • Ronan Mcnulty
  • Sajid Ali
  • Sara Collins
  • Simon Kuberski
  • Simon Weishäupl
  • Simona Cerrato
  • Simran Singh
  • Sinead Ryan
  • Stefan Schaefer
  • Stefan Sint
  • Tassos Vladikas
  • Thomas Spriggs
  • Tim Harris
  • Tobias Tsang
  • Tomasz Korzec
  • Ulli Wolff
  • Urs Wenger
  • Valentina Forini
  • Wolfgang Unger
    • 9:00 AM 10:00 AM
      Status Summary I (access restricted to EuroPLEx members)
      • 9:00 AM
        WP1 Indirect searches for New Physics 15m
        Speaker: Carlos Pena Ruano (Universidad Autonoma de Madrid (ES))
      • 9:15 AM
        WP2 Direct searches for New Physics 15m
        Speaker: Claudio Pica (University of Southern Denmark)
      • 9:30 AM
        WP3 QCD under extreme conditions 15m
        Speaker: Christian Schmidt (University of Bielefeld)
      • 9:45 AM
        WP6 Algorithms 15m
        Speaker: Gunnar Bali (Universität Regensburg)
    • 10:00 AM 10:30 AM
      Break 30m
    • 10:30 AM 12:00 PM
      Introduction to QCD+QED in finite volume 1h 30m

      Lattice QCD simulations have entered the precision era. Thanks to the combined efforts of several lattice collaborations, the masses, leptonic and semileptonic decay rates of light pseudoscalar mesons are presently known, in QCD, with sub-percent relative errors. At this level of precision strong isospin breaking and QED radiative corrections cannot be neglected and have to be taken into account with the required non-perturbative accuracy. This can in principle be done by performing lattice simulations of QCD+QED. The inclusion of the electromagnetic interactions in finite volume lattice simulations, however, poses both theoretical and numerical problems.

      In particular, as a consequence of Gauss law, electrically-charged states are absent in a finite volume with periodic boundary conditions. While this statement is fairly trivial al the classical level, I will discuss in some detail what it means at the quantum-mechanical level. We will see how C-parity boundary conditions can be used to circumvent this problem in a fully consistent way (and in fact it is the only way if one insists on gauge and translational invariance). A possible lattice discretization of QCD+QED will also be discussed.

      Speaker: Agostino Patella
    • 12:00 PM 1:30 PM
      Lunch Break 1h 30m
    • 1:30 PM 2:30 PM
      Machine learning for sampling in lattice field theory 1h

      In the context of lattice quantum field theory calculations in particle and nuclear physics, I will describe avenues to accelerate sampling from known probability distributions using machine learning. I will focus in particular on flow-based generative models, and describe how guarantees of exactness and the incorporation of complex symmetries (e.g., gauge symmetry) into model architectures can be achieved. I will show the results of proof-of-principle studies that demonstrate that sampling from generative models can be orders of magnitude more efficient than traditional Hamiltonian/hybrid Monte Carlo approaches in this context.

      Speaker: Phiala Shanahan
    • 2:30 PM 3:00 PM
      Break 30m
    • 3:00 PM 4:30 PM
      Strong coupling constant from the lattice 1h 30m

      The strong coupling constant is one of the crucial ingredients for precision predictions for the LHC.
      We discuss lattice inputs for the determination of the strong coupling with a specific focus on the systematic errors.

      Speaker: Luigi Del Debbio
    • 9:00 AM 10:00 AM
      Status Summary II (access restricted to EuroPLEx members)
      • 9:00 AM
        WP4 Lattice for progress in Formal Field Theory 15m
        Speaker: Valentina Forini (Humboldt University Berlin)
      • 9:15 AM
        WP5 New Tools for High Precision Lattice QCD 15m
        Speaker: Marina Krstic Marinkovic (LMU Munich)
      • 9:30 AM
        WP7 Hardware-aware Progress in Software 15m
        Speaker: Dr Antonin Portelli (The University of Edinburgh)
      • 9:45 AM
        WP8 Advanced Statistics and Data Analysis 15m
        Speaker: Biagio Lucini (Swansea University)
    • 10:00 AM 10:30 AM
      Break 30m
    • 10:30 AM 12:00 PM
      A new strategy for the determination of alpha_s 1h 30m
      Speaker: Alberto Ramos Martinez
    • 12:00 PM 2:00 PM
      Lunch Break 2h
    • 2:00 PM 3:30 PM
      Introduction to Scale Setting in QCD 1h 30m

      In this lecture I will explain, how a dimensionful scale
      is introduced in lattice QCD simulations. All sources of systematic uncertainties are discussed before the whole procedure is demonstrated for the case of the 2+1 flavor simulations of the CLS consortium.

      Speaker: Tomasz Korzec
    • 4:00 PM 5:30 PM
      Escape Room Team building 1h 30m
    • 9:00 AM 10:30 AM
      High precision scale setting in lattice QCD 1h 30m
      Speaker: Lukas Varnhorst
    • 10:30 AM 11:00 AM
      Break 30m
    • 11:00 AM 12:00 PM
      Sp(2N) gauge theories for beyond the standard model physics 1h
      Speaker: Davide Vadacchino
    • 12:00 PM 1:45 PM
      Lunch Break 1h 45m
    • 1:45 PM 2:30 PM
      "Lies-to-Children" and Science Communication 45m

      Lies-to-children is a common concept in science education. It refers to the simplified versions of a subject that are usually taught to students in order to provide them with the mental structure needed to move beyond those same lies. One typical example is classical mechanics: a "wrong" picture of reality that is however extremely useful if one wants to understand quantum mechanics and relativity.

      In this talk I will explain why lies-to-children is also a pivotal concept to understand science communication. Here it works differently because it is encoded in metaphors, not in the subjects of a curriculum, but the idea is the same. We'll also see how lies-to-children are unavoidable when communicating theoretical physics to a lay audience, and we'll learn how to be aware of their pros and cons in order to use them properly. Finally, through some motivating examples, I will encourage all EuroPLEx members to lie as much and as finely as possible about QCD in QuarkBits, the EuroPLEx collaborative blog.

      Speaker: Ernesto Lozano Tellechea
    • 2:30 PM 3:00 PM
      Break 30m
    • 3:00 PM 4:30 PM
      The QCD Phase diagram: introduction 1h 30m

      I will review our current knowledge of the phase diagram of strongly interacting matter. In particular, I will focus on the chiral and deconfinement phase transitions, the corresponding order parameters and their behavior at finite temperature and density.

      Speaker: Claudia Ratti
    • 9:00 AM 10:00 AM
      Nucleon axial structure from lattice QCD: Controlling pion pole enhanced excited states 1h

      We present a new analysis method that allows you to understand and model excited state contributions in observables that are dominated by a pion pole. We apply this method to extract axial and (induced) pseudoscalar nucleon isovector form factors, which satisfy the constraints due to the partial conservation of the axial current up to expected discretization effects. Effective field theory predicts that the leading contribution to the (induced) pseudoscalar form factor originates from an exchange of a virtual pion, and thus exhibits pion pole dominance. Using our new method, we can recover this behavior directly from lattice data.

      (Work in collaboration with Gunnar Bali, Lorenzo Barca, Sara Collins, Michael Gruber, Marius Löffler, Andreas Schäfer, Wolfgang Söldner, Simon Weishäupl and Thomas Wurm.)

      Speaker: Phlipp Wein
    • 10:00 AM 10:30 AM
      Break 30m
    • 10:30 AM 12:00 PM
      Estimating finite volume effects in QCD+QED simulations by using relativistic EFTs 1h 30m

      Lattice QCD simulations have entered the precision era. Thanks to the combined efforts of several lattice collaborations, the masses, leptonic and semileptonic decay rates of light pseudoscalar mesons are presently known, in QCD, with sub-percent relative errors. At this level of precision strong isospin breaking and QED radiative corrections cannot be neglected and have to be taken into account with the required non-perturbative accuracy. This can in principle be done by performing lattice simulations of QCD+QED. The inclusion of the electromagnetic interactions in finite volume lattice simulations, however, poses both theoretical and numerical problems. A particularly important issue are the finite volume effects. In the case of the masses of stable hadrons these are power-law suppressed in QCD+QED while they vanish exponentially fast in QCD. The issue becomes much more delicate in the case of decay rates where one has to cope with the well known problem of the infrared divergences, i.e. with diverging finite volume effects, that might appear at intermediate stages of the calculations. In this lecture I will discuss how finite volume effects in QCD+QED can be understood and estimated by using relativistic effective field theories techniques. I will discuss in particular the cases of the finite volume effects on the masses of stable hadrons and of the infrared divergences appearing in the leptonic decay rates of pseudoscalar mesons.

      Speaker: Nazario Tantalo
    • 12:00 PM 2:30 PM
      Lunch Break 2h 30m
    • 2:30 PM 4:00 PM
      The QCD phase diagram: state of the art 1h 30m

      I will present the state of the art results on the QCD transition line and constraints on the location of the critical point from lattice QCD simulations.

      Speaker: Claudia Ratti
    • 4:00 PM 4:15 PM
      END 15m