alphas-2024: Workshop on precision measurements of the QCD coupling constant

5 Feb 2024, 08:00 → 9 Feb 2024, 21:55 Europe/Zurich

ECT* Trento

David d'Enterria (CERN), Giulia Zanderighi (Max Planck Society (DE)), Ines Campo (FBK/ECT*), Stefan Kluth (Max Planck Society (DE))

The "alphas-2024: Workshop on precision measurements of the strong coupling constant" conference, will be held at ECT*-Trento in the first week of February 2024, 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). 

Previous meetings:

• alpha_s(2022), ECT*, Trento
• alpha_s(2019), ECT*, Trento
• alpha_s(2015), CERN, Geneva
• alpha_s(2011), MPI, Munich

 

We run a CERN mattermost channel to keep minutes of the meeting.

 

Monday 5 February

10:30 → 11:00 Coffee break

12:00 → 13:00 Lunch

13:00 → 13:15 Introduction and organisation

Aim of the workshop, organise Snowmass contribution

alphas24_ect_intro.pdf

13:00 Presentation of the workshop

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

alphas24_ect_intro.pdf

13:15 → 15:45 alpha_s: Lattice QCD

alphas24.jpg

13:15 Accurate determination of the strong coupling

Speaker: Alberto Ramos Martinez (Univ. of Valencia and CSIC (ES))

trento_24.pdf

13:45 RG improvement and alpha_s determination from relativistic sum rules

Speaker: Mohd Siddique Akbar Alam Khan (Indian Institute of Science Bangalore)

Alam_Alpha_2024.pdf

14:15 Extraction of alpha_S using energy of a static quark-antiquark pair within hyperasymptotic approximation

Speaker: Cesar Ayala

Alphas24Ayala.pdf

14:45 TUMQCD: alpha from 2+1+1 static potential

Speaker: Viljami Leino

Leino_211_alpha_tumqcd_trento24.pdf

15:15 Factorial Growth in pQCD and Implications for αs

Speaker: Andreas Kronfeld

ask4alpha_s.pdf

15:45 → 15:50 ECT* welcome (Dir. Gert Aarts)

15:50 → 16:15 Coffee break

16:15 → 19:15 alpha_s: Lattice QCD

alphas24.jpg

16:15 Lambda_0 from the statice force on the lattice with gradient flow

Speaker: Julian Mayer-Steudte

JulianMayer-Steudte_AlphaS_Trento_2024.pdf

16:45 Determination of alpha_s in 2+1 flavor lattice QCD from gradient flow

Speaker: Hai-Tao Shu

alphas2024.pdf

17:15 Lattice determination of the strong coupling constant from moments of quarkonium correlators

Speaker: Peter Petreczky

alphas_ect24.pdf

17:45 On the heavy quark correlator moments method

Speaker: Rainer Paul Sommer (DESY)

trento24-RS-trimmed.pdf

18:15 FLAG working group on alpha_S

Speaker: Stefan Sint (Trinity College Dublin)

alphas_24_sint.pdf

Tuesday 6 February

09:00 → 10:30 Morning

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning

12:00 → 13:00 Lunch break

13:00 → 13:30 alpha_s: Lattice QCD

alphas24.jpg

13:00 Discussion: alpha_s from lattice QCD

13:30 → 15:30 alpha_s from DIS & PDFs

13:30 Perspectives on measurements of alpha_s from spin structure functions

Speaker: Alexandre Deur (Jefferson Lab)

BjSR_alpha_EIC.pdf

14:00 Extraction of the strong coupling with HERA and EIC inclusive data

arxiv:2307.01183

Speaker: ANDREA BARONTINI (Università degli studi di Milano)

Alpha_s_Barontini.pdf

14:30 Measurement of jet production in deep inelastic scattering and NNLO determination of the strong coupling at ZEUS

DESY-23-129, arxiv:2309.02889

Speaker: Florian Lorkowski (University of Zürich)

InclusiveJets.pdf

15:00 MSHT20aN3LO alphas

Speaker: Thomas Cridge (DESY)

MSHT20_alphas2024.pdf

15:30 → 16:00 Coffee break

16:00 → 16:30 alpha_s from DIS & PDFs

16:00 alphas and NNPDF fits

Speaker: Luigi Del Debbio (The University of Edinburgh (GB))

Trento24.pdf

16:30 → 18:30 alpha_s at hadron colliders

16:30 Determination of alpha_S from azimuthal correlations among jets (CMS)

Speaker: Paris Gianneios (Université Libre de Bruxelles (BE))

alphaS2024_Trento_Paris_Gianneios.pdf

17:00 Determination of the strong coupling from TEECs in multijet events at sqrt(s) = 13 TeV with the ATLAS detector

Speaker: Fernando Barreiro Alonso (Universidad Autonoma de Madrid (ES))

alphas_2024.pdf

17:30 Measurement of alpha_S from energy correlators in jets (CMS)

Speaker: Meng Xiao (ZJU - Zhejiang University (CN))

ENCAlphaS.pdf

18:00 Possible strategy to extract αS using secondary Lund planes

Speaker: Cristian Baldenegro Barrera (Sapienza Universita e INFN, Roma I (IT))

AlphaS meeting.pdf

18:30 → 19:00 alpha_s from DIS & PDFs

18:30 3-loop hevy flavor Wilson coefficients to the unpolarized and polarized deep-inelastic scattering

Speaker: Prof. Johannes Bluemlein

TRENTO24.pdf

Wednesday 7 February

09:00 → 10:30 Morning

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning

12:00 → 13:00 Lunch

13:00 → 15:30 alpha_s at hadron colliders

13:00 Determination of alpha_S from the Z-boson transverse-momentum distribution (CDF)

Speakers: Giancarlo Ferrera (Università degli Studi e INFN Milano (IT)), Giancarlo Ferrera (University of Milan)

ferrera-alphas-24.pdf

13:30 Determination of the strong coupling constant via the Drell Yan process (ATLAS)

Speaker: Matthias Schott (CERN / University of Mainz)

ATLSStrongCouplingConstant.pdf

14:00 Measurement of αs at CMS: status and prospects

Speaker: Patrick Connor (University Hamburg (DE))

ALPHAS_7_Feb_2024_CMS_overview.pdf

14:30 Discussion: alpha_s from PDFs & LHC data

15:30 → 16:00 Coffee break

16:00 → 19:00 alpha_s from e+e- hadronic final states

16:00 AlphaS determination from event shapes / the static potential

Speaker: Prof. VICENT Mateu (University of Salamanca)

Mateu-ES.pdf

16:30 Determining alpha_S from Thrust with Power Corrections

Speaker: MIGUEL ÁNGEL BENITEZ RATHGEB

Benitez_alphas-2024.pdf

17:00 Renormalons and power corrections in e+e- annihilation in the three-jet region

Speaker: Paolo Nason (Universita & INFN, Milano-Bicocca (IT))

Trento-2-2024.pdf

17:30 Next-to-leading power correction to event shape variables.

Speaker: Mr Shubham Mishra (IIT Hyderabad)

alphas_IITH.pdf

18:00 Effect of Renormalon Scheme and Perturbative Scale Choices on alpha_s from e+e- event shapes

Speaker: Christopher Lee (LANL)

Lee_C_Trento_2024.pdf

18:30 The QCD Coupling at all Scales from Light Front Holography

Speakers: Alexandre Deur (Jefferson Lab), Stanley J. brodsky (SLAC National Accelerator Laboratory, Stanford University)

HLFQCD_alphas24.pdf

Thursday 8 February

09:00 → 10:30 Morning

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning

11:00 Discussion on PDG averaging

Speakers: Joey Huston (Michigan State University (US)), Klaus Rabbertz (KIT - Karlsruhe Institute of Technology (DE)), Giulia Zanderighi (Max Planck Society (DE))

PDG-Average_alpha_s-2024_2024028.pdf

12:00 → 13:00 Lunch

13:00 → 15:30 alpha_s from e+e- hadronic final states

13:00 Strong coupling constant from multiplicity ratio of QCD gluon and quark jets

Speaker: Dr Redamy Pérez-Ramos (IPSA/LPTHE)

QCD_talk_Trentino_2024.pdf

13:30 The complete EM Euclidean Adler function and its interplay with alpha_s and alpha_QED

Speaker: Antonio Rodriguez Sanchez

alphasrodriguez.pdf

14:00 Reliably determination of the QCD coupling from Ruds measurements

Speaker: Jian-Ming Shen

14:30 Power corections and alpha_S from e+e- -> hadrons

Speaker: Stephan Narison

alphas24-v3.pdf

15:00 Discussion: alpha_S from e+e- to hadronic final states

15:30 → 16:00 Coffee break

16:00 → 19:00 alpha_s from tau decays

16:00 alpha_S from tau decay

Speaker: Santi Peris

More on Pich's _complaints.pdf

Peris.pdf

16:30 Hadronic tau spectral function moments in the RF gluon condensate scheme

Speaker: Andre Hoang

Hoang-Tau-RF-GC.pdf

17:00 Charm mass effects in the Laplace-Borel sum rules for tau decay data

Speaker: Gorazd Cvetic

alphas2024_GC.pdf

17:30 Violations of quark-hadron duality in low-energy determinations of the strong coupling

Speaker: Antonio Pich

Trento2024_DV_Pich.pdf

18:00 Discussion: alpha_s from tau decays

Friday 9 February

09:00 → 10:30 Morning

10:30 → 11:00 Coffee break

11:00 → 12:00 Morning

12:00 → 13:00 Lunch