Workshop on high-precision alpha_s measurements: from LHC to FCC-ee

12 Oct 2015, 08:00 → 13 Oct 2015, 19:25 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

David d'Enterria (CERN), Peter Skands (Monash University (AU))

The workshop is part of the FCC-ee "QCD & gamma-gamma physics" working group activities (aiming at a Yellow Report in 2016), and aims at addressing the following issues:

• What is the current state-of-the-art of all alpha_s determination methods from the theoretical & experimental point of view ?
• What is the current size of the theoretical uncertainties: missing higher orders, electroweak corrections, power corrections, hadronization corrections,... ?
• What is the expected alpha_s uncertainty in ~10 years from now: theoretical developments, plus O(1 ab^-1) p-p at 14 TeV at the LHC ?
• What are the expected improvements brought about by the FCC-ee: 10¹² Z's at sqrt(s)=m_Z; 10⁸ W's at sqrt(s)=m_WW; similar orders-of-magnitude for tau, jets,...? What are the systematic errors that the FCC-ee detectors should target in order to match the expected statistical precision, or where that is not possible, what are the important theoretical targets that should be met or exceeded?

Monday, 12 October

1 Presentation / Goals of the workshop

Speakers: David d'Enterria (CERN), Peter Skands (Monash University (AU))

dde_alphas_workshop_intro_cern_oct15.pdf

2 World Summary of alpha_s (2015)

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

alphas-CERN2015.pdf

3 alpha_s and physics beyond the Standard Model

Speaker: francesco Sannino (CP3-Origins)

Sannino-alpha_s-CERN-2015.pdf

4 Impact of alpha_s on Higgs prod. & decay uncertainties

Speaker: Luminita Mihaila

mihaila_fcee15.pdf

15:40 Coffee break

alpha_s at low scales

5 alpha_s from lattice QCD

Speaker: paul mackenzie (Fermilab)

15CERNalphas.pdf

6 Determination of αs from the QCD static energy

Speaker: Xavier Garcia Tormo

xavier_alphas_CERN_FCC.pdf

7 alpha_s from pion decay factor

Speaker: Jean-Loic Kneur (Univ. Montpellier 2)

kneur_alphas.pdf

8 alpha_s from hadronic tau decays

Speakers: Antonio Pich (University of Valencia), Antonio Pich (Unknown)

alphas-tau_CERN-2015.pdf

9 alpha_s from hadronic quarkonia decays

Speaker: Soto i Riera Joan (UB)

joan_0cern15.pdf

10 alpha_s from soft parton-to-hadron FFs

Speakers: David d'Enterria (CERN), Redamy Perez-Ramos

dde_alphas_FFs_nnlo_cern_oct15.pdf

Tuesday, 13 October

alpha_s at high scales

11 alpha_s from DIS (PDFs) :

Speaker: Johannes Bluemlein (DESY)

JB_dis_alpha.pdf

12 alpha_s from DIS (jets, photoproduction)

Speaker: Michael Klasen

klasen.pdf

13 alpha_s from scaling violations of hard parton-to-hadron FFs

Speaker: Prof. Bernd Kniehl (II. Institut für Theoretische Physik Universität Hamburg)

kniehl.pdf

14 alpha_s from e+e- event shapes

Speaker: Stefan Kluth (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

fcceewstalk.pdf

11:10 Coffee break

15 alpha_s from e+e- C-parameter event shape

Speaker: Andre Hoang (U)

C_param_Hoang.pdf

16 alpha_s from e+e- jet cross sections

Speaker: Andrea Banfi (University of Sussex)

banfi_fccee_15.pdf

17 alpha_s from hadronic Z decays and from the full electroweak fit

Speaker: Klaus Monig (Deutsches Elektronen-Synchrotron (DE))

moenig_alphas_globalfit.pdf

18 alpha_s from sigma(e+e--->hadrons)

Speaker: Johann Kuehn (KIT, Karlsruhe, Germany)

Kuehn_CERN_Oct_2015.pdf

19 alpha_s from hadronic W decays

Speakers: David d'Enterria (CERN), Matej Srebre (CERN)

w_alphas_v11.pdf

w_alphas_v12.pdf

w_alphas_v14.pdf

13:30 Lunch break

alpha_s at hadron colliders

20 alpha_s from sigma(ttbar) at the LHC

Speaker: Alexander Dimitrov Mitov (University of Cambridge (GB))

AlexanderMitov-alpha_s-2015.pdf

21 alpha_s from sigma(ttbar): latest developments

Speaker: Gavin Salam (CERN)

ttbar-alphas.pdf

22 Future prospects of alpha_s from jets at the LHC at NNLO

Speaker: Joao Pires (Milano Bicocca)

pires.pdf

16:25 Coffee break

23 alpha_s determinations from ATLAS (status & plans)

Speaker: Bogdan Malaescu (Centre National de la Recherche Scientifique (FR))

alphas_ATLAS_Malaescu.pdf

24 alpha_s determinations from CMS (status & plans)

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

alpha-s-at-CMS_FCC-ee_KRabbertz.pdf

25 Conclusions (FCC-ee Yellow Report preparation)

dde_alphas_workshop_conclusion_cern_oct15.pdf

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