Annual Meeting of the Swiss Physical Society 2022

【341】Positronium 1S-2S and 2S-2P precision spectroscopy

29 Jun 2022, 17:00

15m

Room G 140

Talk Nuclear, Particle- and Astrophysics (TASK) Nuclear, Particle- & Astrophysics

Speaker

Mr Lucas de Sousa Borges (ETH Zurich IPA)

Description

Positronium being a purely leptonic atom provides an ideal test-bench of bound-state QED. Because of its simplicity, any deviation from calculations could hint to new physics beyond the standard model. A recent experiment exhibited a 4.2$\sigma$ discrepancy with QED in one of the 2S-2P fine structure transitions, deserving further investigation. This talk will present the ongoing experimental progresses made in the microwave 2S-2P and laser 1S-2S spectroscopy with the help of a pulsed slow positron beam at ETH.

Presentation materials

2022_Fribourg_SPS.pdf