Scale setting: Precision lattice QCD for particle and nuclear physics

Mar 3, 2025, 8:15 AM → Mar 7, 2025, 7:00 PM Europe/Rome

Aula Renzo Leonardi (ECT*)

Alexei Bazavov (Michigan State University, United States), Sara Collins (University of Regensburg), Rainer Sommer (DESY & Humboldt University)

WARNING: for hotel bookings do not give your data to any external services upon email request; there are known cases of fraud

 

Lattice QCD calculations have reached per-mille-level precision for certain experimentally measurable quantities. Often, the limiting systematic uncertainty of such computations comes from determination of the lattice scale, converting the lattice results to physical units. A number of lattice collaborations carried out determinations of theoretical scales (e.g., a popular choice is the gradient flow scale) that are in slight tension. Lattice scale determination with fully accounted systematic uncertainties is not a purely theoretical question as it influences, for instance, the computation of the hadronic contribution to the anomalous magnetic moment of the muon and the determination of the CKM matrix elements. Thus, the precision of the lattice scale plays a direct role in confirming the Standard Model or differentiating new physics beyond the Standard Model. 

POSTER_Bazavov2025.pdf

Mon, March 3

8:15 AM → 8:45 AM Registration

8:45 AM → 10:30 AM Workshop introduction

8:45 AM Workshop introduction

Speaker: Alexei Bazavov (Michigan State University, United States)

slides.pdf

9:00 AM Welcome by the ECT* director

Speaker: Ubirajara van Kolck (IJCLab Orsay & University of Arizona)

9:15 AM Scale setting: motivation and FLAG overview

Speakers: Alexei Bazavov (Michigan State University, United States), Rainer Sommer (DESY & Humboldt University), Sara Collins (University of Regensburg)

slides.pdf

trento-scale-rs-3.pdf

10:00 AM Edinburgh Consensus

Speaker: Alberto Ramos (IFIC)

ed_consensus.pdf

10:30 AM → 11:00 AM Coffee

11:00 AM → 12:00 PM Potential scales

11:00 AM The determination of potential scales $r_0$ and $r_1$ in 2+1 flavor QCD

Speaker: Tom Asmussen (University of Wuppertal)

ECTScale25_TomA.pdf

12:00 PM → 1:30 PM Lunch

1:30 PM → 3:30 PM Potential scales

Convener: Dr Simone Romiti (Uni-Bern)

1:30 PM TUMQCD scale setting status

Speakers: Julian Mayer-Steudte (Technical University Munich), Viljami Leino (Johannes Gutenberg Universität Mainz)

JFMS_scale_setting_Trento.pdf

Leino_trento25_v3.pdf

2:45 PM Discussion of potential scales

Speaker: Gunnar Bali

r0discuss.pdf

3:30 PM → 4:00 PM Coffee

4:00 PM → 5:00 PM Gradient flow scales from leptonic decays

Convener: Dr Simone Romiti (Uni-Bern)

4:00 PM Scale setting with gradient flow on (2+1)-flavor HISQ ensembles

Speaker: Johannes Heinrich Weber (Technische Universität Darmstadt)

ect2025weber.pdf

5:00 PM → 6:00 PM Apertivo

Tue, March 4

9:00 AM → 10:00 AM Gradient flow scales from leptonic decays

Convener: Johannes Heinrich Weber (Technische Universität Darmstadt)

9:00 AM Scale setting for CLS 2+1 simulations

Speaker: Tomasz Korzec (University Wuppertal)

scale.pdf

10:00 AM → 10:30 AM Coffee

10:30 AM → 12:30 PM Gradient flow scales from leptonic decays

Convener: Johannes Heinrich Weber (Technische Universität Darmstadt)

10:30 AM Setting the lattice scale from a combination of Wilson and Wilson twisted mass valence quarks

Speaker: Alejandro Saez (University of Valencia - IFIC)

slides.pdf

11:30 AM Setting the scale of $N_f=2+1+1$ ensembles at the isoQCD physical point

Speaker: Simone Romiti (Uni-Bonn)

main.pdf

12:30 PM → 2:00 PM Lunch

2:00 PM → 3:30 PM Gradient flow scales from leptonic decays

Convener: Andreas Risch

2:00 PM Discussion of gradient flow scales from leptonic decays

Speaker: Alexei Bazavov (Michigan State University, United States)

discuss_fpi.pdf

3:30 PM → 4:00 PM Coffee

4:00 PM → 5:00 PM Testing universality in gauge theories

Speaker: Alberto Ramos (IFIC)

trento_scale_setting.pdf

8:00 PM → 10:00 PM Workshop dinner at restaurant Due Mori

Wed, March 5

9:00 AM → 10:00 AM Gradient flow scales from the Omega baryon mass

Convener: Anthony Grebe (Fermi National Accelerator Laboratory)

9:00 AM Updates from CalLat/CoSMoN

Speaker: Nolan Miller (Helmholtz-Institut Mainz)

presentation.pdf

10:00 AM → 10:30 AM Coffee

10:30 AM → 12:30 PM Gradient flow scales from the Omega baryon mass

Convener: Anthony Grebe (Fermi National Accelerator Laboratory)

10:30 AM New configuration set of HAL QCD collaboration

Speaker: Etsuko Itou (RIKEN)

Etsuko-Itou-2025-03-ECT.pdf

11:30 AM Scale-setting from precise Omega baryons

Speaker: Daniel Mohler

GSI_scale_setting.pdf

12:30 PM → 2:00 PM Lunch

2:00 PM → 3:00 PM The Prony Generalised Eigenvalue Method

Speaker: Carsten Urbach (University of Bonn)

main (1).pdf

3:00 PM → 3:30 PM Coffee

3:30 PM → 5:00 PM Gradient flow scales from the Omega baryon mass

Convener: Matteo Di Carlo (CERN)

3:30 PM Discussion of baryon systematics

Speaker: Sara Collins (University of Regensburg)

baryon_sys.pdf

Thu, March 6

9:00 AM → 10:00 AM Gradient flow scales from the Omega baryon mass

Convener: Etsuko Itou (RIKEN)

9:00 AM Status of High Precision Scale Setting for RBC/UKQCD

Speaker: Julian Parrino (Universität Regensburg)

Trento_Scale_Setting_JP.pdf

10:00 AM → 10:30 AM Coffee

10:30 AM → 12:30 PM Gradient flow scales from the Omega baryon mass

Convener: Etsuko Itou (RIKEN)

10:30 AM High-Precision Scale Setting with the Omega Baryon

Speaker: Anthony Grebe (Fermi National Accelerator Laboratory)

slides.pdf

11:30 AM Determination of a gradient flow scale

Speaker: Kalman Szabo (Forschungszentrum Juelich)

tre25.pdf

12:30 PM → 2:00 PM Lunch

2:00 PM → 4:00 PM Isospin breaking effects

Convener: Kalman Szabo (Forschungszentrum Juelich)

2:00 PM Isospin breaking effects in the leptonic decays of light mesons

Speaker: Matteo Di Carlo (CERN)

ectstar_mdc_2.pdf

3:00 PM Discussion of isospin breaking effects

Speaker: Rainer Sommer (DESY & Humboldt University)

trento-isocorr-rs.pdf

4:00 PM → 4:20 PM Coffee

4:20 PM → 5:00 PM Continuum limit of generalized charm susceptibilities

Speaker: Sipaz Sharma (TUM)

scale_setting.pdf

8:00 PM → 10:00 PM Workshop dinner at restaurant Scrigno del Duomo

Fri, March 7

9:00 AM → 10:00 AM Gradient flow scales from the octet baryon spectrum

9:00 AM Scale setting from the octet baryon spectrum on Nf=2+1 CLS ensembles

Speaker: Gunnar Bali

talk_gunnar.pdf

10:00 AM → 10:30 AM Coffee

10:30 AM → 12:30 PM Chiral perturbation theory

10:30 AM Baryon masses in covariant chiral perturbation theory

Speaker: Xiu-Lei Ren (Helmholtz-Institut Mainz)

Xiu-Lei Ren_2025_scale setting_Trento.pdf

11:30 AM Discussion of convergence of ChPT for baryons

Speaker: Sara Collins (University of Regensburg)

baryon_chpt.pdf

12:30 PM → 1:00 PM Workshop summary

slides.pdf

1:00 PM → 2:30 PM Lunch