alphas-2022: Workshop on precision measurements of the QCD coupling constant

Europe/Zurich
ECT* Trento

ECT* Trento

Strada delle Tabarelle, 286 38123 Villazzano TRENTO (TN)
David d'Enterria (CERN), Giulia Zanderighi (Max Planck Society (DE)), Stefan Kluth (Max Planck Society (DE))
Description

The "alphas-2022: Workshop on precision measurements of the strong coupling constant" conference, will be held at ECT*-Trento in the first week of February 2022, aims at exploring in depth the current status and upcoming prospects in the determination of the QCD coupling constant $\alpha_S(m_Z)$ from the key observables where high-precision experimental measurements and theoretical calculations are (or will be) available: (i) lattice QCD, (ii) hadronic decays of tau leptons, (iii) deep-inelastic electron-proton scattering and global parton densities analyses, (iv) QCD corrections to electroweak precision observables, and analysis of (v) hadronic final states in high energy particle collisions ($e^+e^-$, ep, and pp). This workshop is a follow-up of similar alpha_s meetings that took place in 2011 (MPI, Munich), 2015 (CERN), and 2019 (ECT*-Trento).

The main outcome of the meeting will be an "alpha_S Snowmass White Paper (2022)" writeup to be publicly submitted in 15th March 2022. All contributors will be therefore asked to provide a 1-2 pages summary of their work at the end of the workshop.

 

Participants
  • Abhinav Choudhury
  • Alberto Ramos Martinez
  • Alessandro Guida
  • Alexander Nesterenko
  • Alexandre Deur
  • Alexei Bazavov
  • Ali Mohammadi Ruzbahani
  • Aliaksei Hrynevich
  • Amanda Sarkar
  • Anatoly Kotikov
  • Andre Hoang
  • Andreas Kronfeld
  • Andrii Verbytskyi
  • Antonio Pich
  • Barbara Mele
  • Ben Nachman
  • Bharadwaj Harikrishnan
  • Bogdan MALAESCU
  • Claire Gwenlan
  • Cristian Baldenegro Barrera
  • Daniel Britzger
  • Daniel Savoiu
  • David d'Enterria
  • Diogo Boito
  • Emily Ann Smith
  • Federico Vazzoler
  • Francesco Giuli
  • German Sborlini
  • Giulia Zanderighi
  • Gorazd Cvetic
  • Hamzeh Khanpour
  • Jad Sardain
  • Javier Llorente Merino
  • Jennifer Kathryn Roloff
  • Joey Huston
  • Johannes Bluemlein
  • Johannes Heinrich Weber
  • José Luis Carrasco Huillca
  • Juan Rojo
  • Katerina Lipka
  • Keping Xie
  • Kim Maltman
  • Klaus Rabbertz
  • Leticia Cunqueiro Mendez
  • Luc Poggioli
  • Lucian Harland-Lang
  • Luigi Del Debbio
  • Maarten Golterman
  • Marcel Vos
  • Markus Wobisch
  • Matt LeBlanc
  • Matthias Schott
  • Mattia Dalla Brida
  • Miguel Angel Benitez-Rathgeb
  • Mikhail Barabanov
  • Noah Bray-Ali
  • Nora Brambilla
  • Oldrich Kepka
  • Paolo Nason
  • Patricia Rebello Teles
  • Pavel Nadolsky
  • Pavel Starovoitov
  • Peter Petreczky
  • Pier Monni
  • Ranjit Nayak
  • Redamy Perez Ramos
  • Richard Ball
  • Roger Horsley
  • Roy Lemmon
  • santi peris
  • Shivam Raj
  • Siegfried Bethke
  • Simone Amoroso
  • Simone Marzani
  • Stanley Brodsky
  • Stefan Kluth
  • Stefan Sint
  • Stefano Camarda
  • Sven-Olaf Moch
  • Thomas Cridge
  • Tobias Neumann
  • Toni Makela
  • Valentina Guglielmi
  • Valerio Bertone
  • Vicent Mateu
  • Vitalii Okorokov
  • Zafer Acar
  • Zahra Farazpay
  • Zdenek Hubacek
    • 10:30 AM
      Coffee break
    • 12:00 PM
      Lunch
    • 1:45 PM
      ECT* welcome (Dir. Gert Aarts)
    • Introduction and organisation

      Aim of the workshop, organise Snowmass contribution

      • 1
        Presentation / Goals of the workshop / Snowmass White Paper
        Speakers: David d'Enterria (CERN), Giulia Zanderighi (Max Planck Society (DE)), Stefan Kluth (Max Planck Society (DE))
    • alpha_s: Lattice QCD
      • 2
        Update on alpha_s from FLAG
        Speaker: Stefan Sint (Trinity College Dublin)
      • 3
        α_s from lattice QCD: an overview
        Speakers: Andreas Kronfeld, Stefan Sint (Trinity College Dublin)
      • 4
        Strong coupling constant from moments of quarkonium correlators revisited
        Speaker: Johannes Heinrich Weber (Humboldt University of Berlin)
      • 5
        alphas from the static energy and force

        alphas from the static energy

        Speaker: Nora Brambilla
      • 6
        Strong coupling constant determination in 3 flavor QCD from the static energy and free energy
        Speaker: Johannes Heinrich Weber (Humboldt University of Berlin)
    • 4:15 PM
      Coffee break
    • alpha_s: Lattice QCD
      • 7
        Heavy-quark decoupling: a new tool for precision determinations of alpha_s using lattice QCD
        Speaker: Mattia Dallabrida (CERN)
      • 8
        A precise determination of alpha_s from lattice QCD using decoupling of heavy quarks

        A precise determination of alpha_s from lattice QCD using decoupling of heavy quarks

        Speaker: Alberto Ramos Martinez (Univ. of Valencia and CSIC (ES))
      • 9
        Discussion: alpha_s from lattice QCD
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 10:30 AM
      Coffee break
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 12:00 PM
      Lunch break
    • alpha_s from DIS & PDFs
      • 10
        alpha_s in PDF fits
        Speaker: Sven-Olaf Moch
      • 11
        Scheme invariant evolution of non-singlet DIS structure functions at N3LO
        Speaker: Johannes Bluemlein (DESY)
      • 12
        The determination of the strong coupling in the MSHT fit
        Speakers: Thomas Cridge, Thomas Cridge (University College London)
      • 13
        Strong coupling determination from the NNPDF4.0 global analysis
        Speaker: Juan Rojo (VU Amsterdam and Nikhef)
      • 14
        The alpha_s determination in the CT18 analysis
        Speaker: Pavel Nadolsky (Southern Methodist University)
    • 3:30 PM
      Coffee break
    • alpha_s from DIS & PDFs
      • 15
        Impact of jet production data on the next-to-next-to-leading order determination of HERAPDF2.0 parton distributions

        Impact of jet production data on the next-to-next-to-leading order determination of HERAPDF2.0 parton distributions

        Speaker: Amanda Sarkar (University of Oxford (GB))
      • 16
        αs from DIS via a large-x resummation
        Speaker: Anatoly Kotikov (JINR)
    • alpha_s at hadron colliders
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 10:30 AM
      Coffee break
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 12:00 PM
      Lunch
    • alpha_s from e+e- hadronic final states
      • 21
        C-parameter hadronisation in the symmetric 3-jet limit and impact on alpha_S fits
        Speaker: Pier Francesco Monni (CERN)
      • 22
        Linear power correctrions to shape variables in e+e- annihilation
        Speaker: Paolo Nason (Max Planck Society (DE))
      • 23
        Determination of alpha_{S}​ beyond NNLO from the e^+e^- data
        Speaker: Andrii Verbytskyi (Max Planck Society (DE))
      • 24
        alpha_s from groomed event shapes
        Speaker: Simone Marzani
      • 25
        Hadronic vacuum polarization function, R-ratio, and the strong coupling
        Speaker: Alexander Nesterenko (JINR)
    • 3:30 PM
      Coffee break
    • alpha_s from e+e- hadronic final states
      • 26
        alpha_s from hadronic W and Z decays
        Speaker: David d'Enterria (CERN)
      • 27
        Strong coupling​ determination at NNLO*+NNLL accuracy from the energy evolution of jet fragmentation functions at low z

        Strong coupling​ determination at NNLO*+NNLL accuracy from the energy evolution of jet fragmentation functions at low z

        Speaker: Redamy PEREZ Ramos (IPSA, Ivry-sur-Seine)
    • Other alpha_s extractions
    • alpha_s from e+e- hadronic final states: Discussion: alpha_s from e+e-
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 10:30 AM
      Coffee break
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 12:00 PM
      Lunch
    • alpha_s at hadron colliders
      • 31
        alpha_s from jet production at HERA and the LHC
        Speakers: Daniel Britzger (Deutsches Elektronen-Synchrotron (DE)), Daniel Britzger (Max-Planck-Institut für Physik München)
      • 32
        A novel method for computing cross section ratios in pQCD (for alpha_s deteminations)
        Speaker: Markus Wobisch (Louisiana Tech University (US))
      • 33
        Energy range for the RGE test and PDF sensitivity in alpha_S evaluations from jet cross section ratios at the LHC
        Speaker: Bogdan Malaescu (Centre National de la Recherche Scientifique (FR))
      • 34
        alpha_S from the Z-boson transverse momentum distribution
        Speaker: Stefano Camarda (CERN)
    • alpha_s from tau decays
      • 35
        Determination of the strong coupling from tau decays: current status
        Speaker: Antonio Pich (IFIC, U. Valencia -.)
    • 3:30 PM
      Coffee break
    • alpha_s from tau decays
      • 36
        Extraction of alpha_s data using Borel-Laplace sum rules for tau decay data
        Speaker: Gorazd Cvetic
      • 37
        The strong coupling from an improved tau vector isovector spectral function
        Speaker: Santi Peris
      • 38
        alpha_s from e+e- to hadrons around the tau-mass scale
        Speaker: Diogo Boito
      • 39
        On the use of the operator product expansion in finite-energy sum rules for light-quark correlators
        Speaker: Maarten Golterman
      • 40
        Reconciling FOPT and CIPT alpha_s determinations from hadronic tau spectral function moments
        Speaker: Andre Hoang
      • 41
        Discussion: alpha_s from tau decays
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 10:30 AM
      Coffee break
    • Individual preparation of White Paper contributions (Asia/EU participants)
    • 12:00 PM
      Lunch
    • 42
      Discussion on PDG averaging
      Speakers: Giulia Zanderighi (Max Planck Society (DE)), Joey Huston (Michigan State University (US)), Klaus Rabbertz (KIT - Karlsruhe Institute of Technology (DE))
    • 43
      Discussion and preparation of Snowmass White Paper (2022).
      Speakers: David d'Enterria (CERN), Giulia Zanderighi (Max Planck Society (DE)), Stefan Kluth (Max Planck Society (DE))