7th International Symposium on Symmetries in Subatomic Physics (SSP2018)

Session

QED

13 Jun 2018, 12:20

Aachen

67. Positronium and Muonium 1S-2S laser spectroscopy

Paolo Crivelli (ETH Zurich (CH))

13/06/2018, 12:20

Talk

Positronium and muonium, being purely leptonic, are very interesting systems to test bound state QED free of finite size effects and hadronic corrections [1]. They are also very sensitive probes to search for New Physics [2] and can be used to extract fundamental constants such as the muon mass and magnetic moment [3].

In this talk, we report the current status of the ongoing experiment...

17. Measurement of the fine-structure constant as a test of the Standard Model

Richard Parker

15/06/2018, 11:00

Talk

Measurements of the fine-structure constant a require methods from across subfields and are thus powerful tests of the consistency of theory and experiment in physics. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer, we recorded the most accurate measurement of the fine-structure constant to date: a = 1/137.035999046(27) at 2.0 × 10−10 accuracy. Using multiphoton...

22. Stringent tests of QED using highly charged ions

Prof. Vladimir Shabaev (St.Petersburg State University)

15/06/2018, 11:30

Talk

Present status of tests of QED with highly charged ions is discussed.
The high-precision calculations of the Lamb shift, hyperfine splitting,
and bound-electron g factor are compared with the corresponding experimental
data. The calculations of the electron-positron pair-creation probabilities in low-energy heavy-ion collisions are considered. Special attention is focused on tests of QED at...

45. Precise spectroscopy of muonium hyperfine structure at J-PARC

Shun Seo (The University of Tokyo)

15/06/2018, 12:00

Talk

Our experimental group, MuSEUM (Muonium Spectroscopy Experiment Using Microwave), has been doing a precise spectroscopy of muonium ground state hyperfine splitting (MuHFS) with high-intensity pulsed muon beam supplied from J-PARC. We aim ten-fold improvement of the preceding measurement of the experimental value of MuHFS both at zero magnetic field and in high magnetic field (1.7 T). Muonium...

54. Stringent tests of bound-state QED using highly charged ions

Dr Sven Sturm (Max-Planck Institut für Kernphysik)

15/06/2018, 12:30

Talk

The ultra-precise determination of the g-factor of highly charged ions is a unique possibility to test the validity of the Standard Model, particularly Quantum Electrodynamics (QED) in extreme electric fields up to 10¹⁶ V/cm. While the weak-field regime has been exquisitely tested, in the presence of strong fields higher-order contributions beyond the Standard Model might become...