alphas-2019: Workshop on precision measurements of the QCD coupling constant

11 Feb 2019, 08:00 → 15 Feb 2019, 19:00 Europe/Zurich

ECT* Trento

David d'Enterria (CERN), Stefan Kluth (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

The "alphas-2019: Workshop on precision measurements of the strong coupling constant" conference, to be held at ECT* (Trento), 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 density 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).

 

alphas_2019_proceeds_July_1st.pdf

alphas_2019_proceeds.tar.gz

Poster - Precision measurements of the strong coupling constant.pdf

Program - alphas-2019 Workshop on precision measurements of the QCD coupling constant.pdf

Workshop PICTURE

Monday, 11 February

1 Arrival of the participants

10:30 Coffee break

2 Arrival of the participants

12:30 Lunch

14:00 ECT* welcome

Overview and Introduction

3 Presentation / Goals of the workshop

Speakers: David d'Enterria (CERN), Stefan Kluth (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

alphas19_ect_intro.pdf

4 World Summary of alpha_s before 2019

Speaker: Siegfried Bethke (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

Trento-alphas-pre2019.pdf

5 (alpha_s pre-2019 discussion)

15:15 Coffee break

alpha_s: Lattice QCD

6 alpha_s from the lattice: FLAG 2019 average

Speaker: Rainer Paul Sommer (DESY)

2019-alphas-Trento-rs.pdf

7 Strong coupling constant from the moments of quarkonium correlators

Speaker: Peter Petreczky (BNL)

trento19.pdf

8 alpha_s from lattice ALPHA collaboration

Speaker: Stefan Sint (Trinity College Dublin (IE))

trento19.pdf

Tuesday, 12 February

alpha_S from electroweak observables

9 The QCD coupling at all scales and the elimination of renormalization scale uncertainties (Remote)

Speaker: Stanley J. Brodsky (SLAC National Accelerator Laboratory, Stanford University)

SJB alpha_s ECT_ 2019.pdf

10 The five-loop beta function of QCD

Speaker: Johann Kuehn (KIT, Karlsruhe, Germany)

HZBeta.pdf

10:30 Coffee break

alpha_s: Lattice QCD

11 alpha_s from the QCD static energy

Speaker: Nora brambilla

alpha019brambilla.pdf

12 alpha_S from ALPHA

Speaker: Mattia Dalla Brida (DESY - Zeuthen)

alpha_MDB.pdf

13 alpha_s determination from static QCD potential with renormalon subtraction

Speaker: Hiromasa Takaura (Kyushu University)

alphas2019_Takaura.pdf

12:30 Lunch break

alpha_s from DIS & PDFs

14 alpha_S, ABM PDFs, and heavy-quark masses

Speaker: Dr Sergey Alekhin (Hamburg University)

slides.pdf

15 alpha_S from H1 jets

Speaker: Daniel Britzger (Max-Planck-Institut für Physik München)

190212-britzger-alpha_s.pdf

15:00 Coffee break

alpha_s from DIS & PDFs

16 alpha_s from pdfs

Speaker: Joey Huston (Michigan State University (US))

huston_alphas_trento.pdf

17 (Discussion on alpha_s extractions from PDFs)

Wednesday, 13 February

alpha_S from e+e- hadronic and tau pair final states

18 Old and new observables for alpha_S from e+e- to hadrons

Speaker: Gabor Somogyi (University of Debrecen (HU))

old_new_obs_alphas.pdf

19 alpha_S from 2-jet rate in e+e-

Speaker: Andrii Verbytskyi (Max-Planck-Institut fur Physik (DE))

Trento2019_Andrii_Verbytskyi.pdf

10:30 Coffee break

alpha_S from e+e- hadronic and tau pair final states

20 The strong coupling from e+e- to hadrons

Speaker: Maarten Golterman (San Francisco State University)

Trento2019-alpha_s.pdf

21 The strong coupling constant from soft parton-to-hadron fragmentation functions

Speaker: Redamy PEREZ Ramos (IPSA, Ivry-sur-Seine)

QCD_talk_Trentino_2019.pdf

12:30 Lunch

alpha_s at hadron colliders

22 alpha_s from jets in pp collisions

Speaker: Dr Joao Ramalho Pires (CFTP, Instituto Superior Tecnico, Universidade de Lisboa)

piresTrento.pdf

23 alpha_S Jet substructure and a possible determination of the QCD coupling

Speaker: Felix Ringer (Lawrence Berkeley National Laboratory)

Trento19_FRinger.pdf

15:00 Coffee break

alpha_s at hadron colliders

24 Extractions of the strong coupling constant in ATLAS

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

pres_alphas_2019.pdf

25 alpha_S determinations from CMS

Speaker: Klaus Rabbertz (KIT - Karlsruhe Institute of Technology (DE))

alphas-from-CMS_alphas-2019_2019_KRabbertz.pdf

Thursday, 14 February

alpha_s at hadron colliders

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

Speakers: Andres Poldaru (National Institute of Chemical Physics and Biophysics (EE)), David d'Enterria (CERN)

Poldaru_alpha_s_WZ_Trento.pdf

27 Determination of alphas(mZ) from the Z-boson transverse momentum distribution

Speaker: Stefano Camarda (CERN)

zptalphas.pdf

10:30 Coffee break

alpha_s from tau decays

28 alpha_s from hadronic tau decay

Speaker: santiago peris (Univ. Autonoma de Barcelona)

Alpha-S(Trento).pdf

29 QCD coupling: scheme variations and tau decays

Speakers: Ramon Miravitllas (UAB, IFAE), Ramon Miravitllas Mas

Ramon_Miravitllas_Trento.pdf

30 (Discussion on alpha_s extractions from tau decays)

12:30 Lunch

31 alpha_s from hadronic W decays

Speaker: David d'Enterria (CERN)

dde_alphas_Wdecay_ect2019.pdf

32 Agora - discussion and preparation of proceedings contributions

15:30 Coffee break

33 Agora - discussion and preparation of proceedings contributions

Friday, 15 February

34 Discussion on PDG averaging

Speakers: Giulia Zanderighi, Joey Huston (Michigan State University (US))

10:30 Coffee break

35 Discussion on alpha_s averaging. Workshop summary

12:30 Lunch

36 Departure of the participants