The Evaluation of the Leading Hadronic Contribution to the Muon g-2: Consolidation of the MUonE Experiment and Recent Developments in Low Energy e+ e- Data

3 Jun 2024, 09:00 → 7 Jun 2024, 16:00 Europe/Berlin

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

The aim of the Topical Workshop is to assess the state of the art of the theoretical determination of the muon anomalous magnetic moment, a_μ, in view of the new measurements of the E989 Muon g-2 experiment at Fermilab and the new approach under development by the E34 collaboration at J-PARC. The workshop will focus on a_μ^HLO, the leading hadronic contribution to the muon g-2, both analyzing the most recent experimental and theoretical results for its determination and the development of the Radiative Corrections and Monte Carlo tools for low energy e⁺e^- to hadrons data.

Particular attention will be devoted to MUonE, a recently proposed experiment at CERN which aims at measuring the running of the electromagnetic coupling constant in the spacelike region by scattering high-energy muons on atomic electrons of a low-Z target through the process μe → μe. The differential cross section of this process provides the direct measurement of a_μ^HLO and, therefore, an independent determination of the theoretical prediction for a_μ competitive with the timelike dispersive approach.

The workshop follows the successful Topical Workshops held at MITP in 2018 and 2022. 

Monday, 3 June

10:00 → 10:10 Welcome from MITP Director

Speaker: Matthias Neubert (Johannes Gutenberg University Mainz)

10:10 → 10:50 The Standard Model prediction of the muon g-2

Speaker: Marc Knecht

10:50 → 11:30 Muon g-2: experimental status

Speaker: Anna Driutti

11:30 → 12:10 Status of the MUonE experiment

Speaker: Riccardo Nunzio Pilato

12:10 → 13:45 Lunch

13:45 → 14:25 Theory for MUonE

Speaker: Fulvio Piccinini

14:25 → 15:05 Atomic binding corrections for fixed target muon-electron scattering

Speaker: Ryan Plestid

15:05 → 16:05 Coffee break

Tuesday, 4 June

09:00 → 10:00 MESMER status and backgrounds implementation

Speakers: Andrea Gurgone, Ettore Budassi

10:00 → 11:00 McMule for MUonE and related topics

Speaker: Marco Rocco

11:00 → 11:30 Coffee break

11:30 → 12:10 N3LO for MUonE

Speaker: Matteo Fael

12:10 → 13:40 Lunch

13:40 → 14:20 Status of MUonE analysis and first results from the 2023 test run

Speaker: Giovanni Abbiendi

14:20 → 14:50 An alternative approach to extract hadronic \Delta\alpha from MUonE data

Speaker: Riccardo Nunzio Pilato

14:50 → 15:20 Coffee bream

15:20 → 15:50 NLO and NNLO HVP contributions to the muon g-2

Speaker: Stefano Laporta

15:50 → 16:20 Numerical evaluation of NNLO interferences

Speaker: Jonathan Ronca

Wednesday, 5 June

09:00 → 09:40 Status of the hadronic corrections to the muon g-2

Speakers: Gilberto Colangelo, Martin Hoferichter

09:40 → 10:20 An overview of lattice QCD+QED progress for the hadronic vacuum polarization contribution to the muon g-2

Speaker: Davide Giusti

10:20 → 11:00 Dispersion relations and radiative corrections for the two-pion channel

Speaker: Peter Stoffer

11:00 → 11:30 Coffee break

11:30 → 12:10 Strong2020 activities

Speaker: Adrian Signer

12:10 → 12:50 Monte Carlo comparisons

Speaker: Yannick Ulrich

12:50 → 14:05 Lunch

14:05 → 14:20 Pion Form Factor implementation for MCs

Speaker: Andrea Gurgone

14:20 → 15:50 General discussion on Strong2020 report

Speaker: All All

15:50 → 16:20 Coffee break

Thursday, 6 June

09:00 → 09:40 Status of hadronic cross section experiments at low energy e+e- machines

Speaker: Achim Denig

09:40 → 11:00 MC codes overview and news for Strong2020

Speakers: Alan Price, Fedor Ignatov, Francesco Pio Ucci, Fulvio Piccinini, Jeremi Paltrinieri, Lorenzo Cotrozzi, Pau Petit Rosas, Sophie Kollatzsch

11:00 → 11:30 Coffee break

11:30 → 12:30 MC codes overview and news for Strong2020

Speakers: Alan Price, Fedor Ignatov, Francesco Pio Ucci, Fulvio Piccinini, Jeremi Paltrinieri, Lorenzo Cotrozzi, Pau Petit Rosas, Sophie Kollatzsch

12:30 → 14:30 Lunch

14:30 → 15:00 Muon g-2 at JPARC (remote)

Speaker: Cedric Zhang

15:00 → 15:30 Model-independent extrapolation of MUonE data with D-Log approximants (remote)

Speaker: Pere Masjuan

Friday, 7 June

10:00 → 12:00 Workshop wrap-up and general discussion

Speaker: All All