Isospin-Breaking Effects on Precision Observables in Lattice QCD

22 Jul 2024, 09:00 → 26 Jul 2024, 16:00 Europe/Berlin

2413/2-430 - MITP Seminar Room (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

Lattice QCD calculations have reached the percent level of uncertainty on several observables entering precision tests of the Standard Model.

Prominent examples are the hadronic vacuum polarisation contribution to the muon $(g-2)$, as well as the leptonic decay rates of pseudoscalar mesons, which are needed to extract values of CKM matrix elements. At this level of precision, isospin-breaking effects become important. They consist of strong isospin breaking (unequal up and down quark masses) and the coupling of quarks to photons (QED effects).  Since the masses of hadrons that are stable under QCD+QED need to be computed in order to calibrate the bare parameters of QCD, the isospin-breaking effects on these masses are just as important.

The scientific goals of the workshop are to:

(a) enable a focused exchange of ideas and experiences among practitioners in this field,

(b) define benchmarks that measure the merit of different methods,

(c) identify the most promising treatments of QED effects on the lattice.

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Monday 22 July ¶

09:00 Registration

1 Isospin-breaking effects from C* boundary conditions¶

Speaker: Agostino Patella

patella.pdf

11:00 Coffee break

2 The Compton amplitude and electromagnetic mass shifts¶

Speaker: Utku Can

can_iblatqcd24 (002).pdf

3 Isospin-breaking Effects in the Octet and Decuplet Baryon Masses¶

Speaker: Alexander Segner

slides_isospin_breaking_effects_in_octet_and_decuplet_baryon_masses.pdf

15:00 Coffee break

Tuesday 23 July ¶

4 EM mass splitting with infinite-volume reconstruction¶

Speaker: Luchang Jin

em-splitting-with-inf-vol-reconstruction-luchang-jin.pdf

10:30 Coffee break

5 Theory calculations for finite-size effects in the hadronic vacuum polarisation¶

Speaker: Nils Hermansson Truedsson

Mainz24_NHT_Final.pdf

6 Coordinate-space approach to e.m. corrections with Pauli-Villars regularisation (I)¶

Speaker: Julian Parrino

mitp_workshop_2024_julian_parrino.pdf

7 Coordinate-space approach to e.m. corrections with Pauli-Villars regularisation (II)¶

Speaker: Dominik Erb

IBLAT2024_ERB.pdf

15:00 Coffee break

Wednesday 24 July ¶

8 Lattice calculations of hadronic vacuum polarisation in the muon g-2¶

Speaker: Aida El-Khadra

10:30 Coffee break

9 Phenomenological estimates of e.m. corrections to HVP¶

Speaker: Kim Maltman

IB_in_dispersive_representations_amu_hvp_integrals_jul22_2024.pdf

10 Electromagnetic corrections computed with a photon mass¶

Speaker: Amy Nicholson

Walker-Loud_MITP_isospin.pdf

15:00 Coffee break

Thursday 25 July ¶

11 Charged vs. neutral vector correlators¶

Speaker: Mattia Bruno

mainz_24_bruno.pdf

10:30 Coffee break

12 Radiative leptonic decays¶

Speaker: Davide Giusti

reph.pdf

13 Electromagnetic corrections in radiative decays with infinite-volume reconstruction method¶

Speaker: Xu Feng

radiative_decay_IVR.pdf

15:00 Coffee break

Friday 26 July ¶

14 Isospin-breaking corrections to light-meson leptonic decays¶

Speaker: Matteo Di Carlo

Di_Carlo_IB_mitp_mdc.pdf

10:30 Coffee break

15 Radiative decays¶

Speaker: Chris Sachrajda

Sachrajda.pdf

16 Final discussion¶