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

31 Jan 2022, 08:00 → 4 Feb 2022, 21:55 Europe/Zurich

ECT* Trento

David d'Enterria (CERN), Giulia Zanderighi (Max Planck Society (DE)), Stefan Kluth (Max Planck Society (DE))

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.

 

alphas_2022_proceeds.tar.gz

Monday, 31 January

10:30 Coffee break

12:00 Lunch

13:45 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))

alphas22_ect_intro.pdf

alpha_s: Lattice QCD

2 Update on alpha_s from FLAG

Speaker: Stefan Sint (Trinity College Dublin)

trento22a.pdf

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)

ectstar-moments-weber.pdf

5 alphas from the static energy and force

alphas from the static energy

Speaker: Nora Brambilla

alphas022.pdf

6 Strong coupling constant determination in 3 flavor QCD from the static energy and free energy

Speaker: Johannes Heinrich Weber (Humboldt University of Berlin)

ectstar-static-weber.pdf

16:15 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)

alpha2022.pdf

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))

alphas22.pdf

9 Discussion: alpha_s from lattice QCD

Tuesday, 1 February

Individual preparation of White Paper contributions (Asia/EU participants)

10:30 Coffee break

Individual preparation of White Paper contributions (Asia/EU participants)

12:00 Lunch break

alpha_s from DIS & PDFs

10 alpha_s in PDF fits

Speaker: Sven-Olaf Moch

trento-alphas-2022.pdf

11 Scheme invariant evolution of non-singlet DIS structure functions at N3LO

Speaker: Johannes Bluemlein (DESY)

talkECT.pdf

12 The determination of the strong coupling in the MSHT fit

Speakers: Thomas Cridge, Thomas Cridge (University College London)

TCridge_MSHT20alphas_talk_Jan21.pdf

13 Strong coupling determination from the NNPDF4.0 global analysis

Speaker: Juan Rojo (VU Amsterdam and Nikhef)

rojo-NNPDF40-alphas.pdf

14 The alpha_s determination in the CT18 analysis

Speaker: Pavel Nadolsky (Southern Methodist University)

m201.nadolsky.pdf

15:30 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))

herajets_2022.pdf

16 αs from DIS via a large-x resummation

Speaker: Anatoly Kotikov (JINR)

SIWco.pdf

alpha_s at hadron colliders

17 New results on strong coupling constant and PDFs from CMS

Speaker: Toni Makela (Deutsches Elektronen-Synchrotron (DE))

New_results_on_strong_coupling_constant_and_PDFs_from_CMS.pdf

18 alpha_s from inclusive W and Z cross sections at the LHC

Speaker: David d'Enterria (CERN)

dde_alphas_sigmaWZ_Trento_feb22.pdf

19 The ATLASpdf21 fit

Speaker: Francesco Giuli (Brandeis University (US))

FGiuli_ATLASpdf21_aS_010222.pdf

20 Discussion: alpha_s from PDFs & LHC data

Wednesday, 2 February

Individual preparation of White Paper contributions (Asia/EU participants)

10:30 Coffee break

Individual preparation of White Paper contributions (Asia/EU participants)

12:00 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)

Trento_2022.pdf

22 Linear power correctrions to shape variables in e+e- annihilation

Speaker: Paolo Nason (Max Planck Society (DE))

Renormalons.pdf

23 Determination of alpha_{S}​ beyond NNLO from the e^+e^- data

Speaker: Andrii Verbytskyi (Max Planck Society (DE))

Trento2022_MOMMC.pdf

24 alpha_s from groomed event shapes

Speaker: Simone Marzani

marzani-alphas-2022.pdf

25 Hadronic vacuum polarization function, R-ratio, and the strong coupling

Speaker: Alexander Nesterenko (JINR)

nesterenko.pdf

15:30 Coffee break

alpha_s from e+e- hadronic final states

26 alpha_s from hadronic W and Z decays

Speaker: David d'Enterria (CERN)

dde_ee_ZW_N3LO_alphas_ECT_feb22.pdf

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)

QCD_talk_Trentino_2022.pdf

Other alpha_s extractions

28 Strong coupling from Charmonium Sum Rules

Speakers: VICENT MATEU BARREDA (University of Salamanca), Vicent Mateu (MPI for Physics, Munich)

article-1

article-2

Mateu-alphaSR.pdf

29 Measurements of alpha_s from spin structure functions

Speaker: Alexandre Deur (JLAB)

BjSR_alpha_EIC.pdf

30 The bottom quark mass from Higgs boson measurements

Speaker: Marcel Vos (IFIC Valencia (ES))

bottom_quark_and_higgs_boson.pdf

alpha_s from e+e- hadronic final states: Discussion: alpha_s from e+e-

Thursday, 3 February

Individual preparation of White Paper contributions (Asia/EU participants)

10:30 Coffee break

Individual preparation of White Paper contributions (Asia/EU participants)

12:00 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)

220203-britzger-alpha_s.pdf

32 A novel method for computing cross section ratios in pQCD (for alpha_s deteminations)

Speaker: Markus Wobisch (Louisiana Tech University (US))

20220203-alphas-novel.pdf

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))

XsecRatios_RGEtests_PDFsensitivity_Malaescu.pdf

34 alpha_S from the Z-boson transverse momentum distribution

Speaker: Stefano Camarda (CERN)

zptalphas.pdf

alpha_s from tau decays

35 Determination of the strong coupling from tau decays: current status

Speaker: Antonio Pich (IFIC, U. Valencia -.)

Trento2022_pich.pdf

15:30 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

Trento2022GCvetic.pdf

37 The strong coupling from an improved tau vector isovector spectral function

Speaker: Santi Peris

Paper1.pdf

Paper2.pdf

Peris _Trento 2022.pdf

38 alpha_s from e+e- to hadrons around the tau-mass scale

Speaker: Diogo Boito

Boito_Trento.pdf

Paper

39 On the use of the operator product expansion in finite-energy sum rules for light-quark correlators

Speaker: Maarten Golterman

Trento2022_Golterman.pdf

40 Reconciling FOPT and CIPT alpha_s determinations from hadronic tau spectral function moments

Speaker: Andre Hoang

Hoang-Tau-CIPT-FOPT.pdf

41 Discussion: alpha_s from tau decays

Friday, 4 February

Individual preparation of White Paper contributions (Asia/EU participants)

10:30 Coffee break

Individual preparation of White Paper contributions (Asia/EU participants)

12:00 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))

huston_alphas_discussion_trento_2022.pdf

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))

alphas22_ect_closure.pdf