Precision Determinations of the Fine-structure Constant

Europe/Berlin
02.430 (Mainz Institute for Theoretical Physics, Johannes Gutenberg University)

02.430

Mainz Institute for Theoretical Physics, Johannes Gutenberg University

Staudingerweg 9 / 2nd floor, 55128 Mainz
Description

The viability of the anomalous magnetic moment of the electron, $a_e$, as a powerful probe of physics beyond the Standard Model (BSM), depends crucially on independent input for the fine-structure constant $\alpha$. At present, the two most precise determinations, from atom interferometry using Cs and Rb atoms, respectively, differ by $5.4\sigma$. Moreover, the precision of the SM prediction for $a_e$ is limited by the knowledge of higher-order QED calculations and hadronic vacuum polarization, which will become relevant once the current puzzle in $\alpha$ is resolved.

In the workshop, we aim to make progress regarding precision measurements and calculations of $\alpha$ and $a_e$, to try and resolve the current tensions and further improve the precision. In addition, the workshop will explore alternative approaches for precision determinations of $\alpha$ --- bound-state $g$-factors and muonic spectroscopy --- to identify the best strategies to constrain BSM effects in $a_e$ at the highest precision achievable. When combined with $a_\mu$, the result has immediate consequences for the flavor and chirality structure of potential BSM effects accessible with lepton anomalous magnetic moments.

Contact @ MITP: Inke Klabunde & Margarita Naumenko
    • 10:00 10:15
      Welcome 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 10:15 11:15
      Morning Sessions: Recent progress toward a new measurement of rubidium recoil using atom interferometry 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Saïda Guellati-Khelifa
    • 11:15 11:45
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 11:45 12:45
      Morning Sessions: Clock atom interferometry for determining the fine-structure constant 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Jesse Schelfhout
    • 12:45 14:00
      Lunch Break 1h 15m
    • 14:00 15:00
      Afternoon Sessions: New Generation of Electron/Positron Magnetic Moment Measurements 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Prof. Gerald Gabrielse
    • 15:00 15:30
      Coffee Break 30m 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 15:30 16:30
      Afternoon Sessions: Measuring the fine-structure constant by large-momentum transfer recoil measurements 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Prof. Holger Mueller
    • 16:30 17:30
      Discussions 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 09:30 10:00
      Discussions: Coffee and Informal Discussions 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 10:00 11:00
      Morning Sessions: The calculation of the electron g-2 at 4 loops and the perspectives for 5 loops 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Stefano Laporta
    • 11:00 11:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 11:30 12:30
      Morning Sessions: 10-th order QED calculation of the electron g-2: special issues 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Sergey Volkov
    • 12:30 14:00
      Lunch Break 1h 30m
    • 14:00 15:00
      Afternoon Sessions: QED and CPT tests with bound electrons and positrons in the LSym and Alphatrap Penning traps 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Prof. Sven Sturm
    • 15:00 15:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 15:30 16:30
      Afternoon Sessions: Precision measurements of bound electron and nucleon g-factors at µTEx 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Andreas Mooser
    • 16:30 17:15
      Afternoon Sessions: Systematic effects in the measurement of the Cesium recoil frequency 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Jack Roth
    • 17:15 18:00
      Discussions 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 09:30 10:00
      Discussions: Coffee and Informal Discussions 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 10:00 11:00
      Morning Sessions: Prospects of a new determination of alpha in muonium 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Paolo Crivelli
    • 11:00 11:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 11:30 12:30
      Morning Sessions: Improved bound-electron g-factor theory after completion of two-loop self-energy calculations 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Bastian Sikora
    • 12:30 14:00
      Lunch Break 1h 30m
    • 14:00 15:00
      Afternoon Sessions: TBD 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Savely Karshenboim
    • 15:00 15:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 15:30 16:30
      Afternoon Sessions: Probing QED and nuclear physics with heavy muonic atoms 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Natalia S. Oreshkina
    • 16:30 17:30
      Discussions 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 18:30 20:00
      Conference Dinner
    • 09:30 10:00
      Discussions: Coffee and Informal Discussions 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 10:00 11:00
      Morning Sessions: Nuclear radii for precision physics 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Prof. Randolf Pohl
    • 11:00 11:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 11:30 12:30
      Morning Sessions: The MuSEUM experiment at J-PARC 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Patrick Strasser
    • 12:30 14:00
      Lunch Break 1h 30m
    • 14:00 15:00
      Afternoon Sessions: Updates to the KNTW dispersive HVP analysis and implications for the evaluation of $a_e^\text{HVP}$ and $\Delta\alpha_\text{had}^{(5)}$ 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Prof. Aidan Wright
    • 15:00 15:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 15:30 16:15
      Afternoon Sessions: The HVP contribution to the lepton anomalous magnetic moments from first principles 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Davide Giusti
    • 16:15 17:00
      Afternoon Sessions: Inclusive measurement of R 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Weiping Wang
    • 17:00 18:00
      Discussions 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
    • 09:30 10:00
      Discussions: Coffee and Informal Discussions 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 10:00 11:00
      Morning Sessions: TBD 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Paride Paradisi
    • 11:00 11:30
      Coffee Break 30m 2413/2-1 - MITP Lounge (MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz)

      2413/2-1 - MITP Lounge

      MITP - Mainz Institute for Theoretical Physics, Johannes Gutenberg University Mainz

      70
    • 11:30 12:30
      Morning Sessions: On the Possibility of Determining α from the Muon Sector at J-PARC 02.430

      02.430

      Mainz Institute for Theoretical Physics, Johannes Gutenberg University

      Staudingerweg 9 / 2nd floor, 55128 Mainz
      Convener: Dr Shusei Kamioka