Oct 20 – 25, 2019
Europe/Zurich timezone

Measurement of the Lamb Shift of Antihydrogen

Oct 22, 2019, 5:30 PM
WHGA/001 - Auditorium (PSI)

WHGA/001 - Auditorium



Gianluca Janka (ETH Zürich)


Antihydrogen studies aim to shed light on the observed
baryon/antibaryon asymmetry in the Universe by comparing the properties
of matter and antimatter with very high precision. In the context of the
GBAR experiment [1] located at CERN, our aim is to perform a measurement
of the antihydrogen Lamb shift with an uncertainty of 100 ppm, which
allows extracting the antiproton charge radius at a level of 10% [2].
Due to the two years shutdown of the accelerator complex at CERN, no
experiments with antihydrogen can be performed until 2021. In the
meantime, the setup is being tested and optimized by using the same
detection method with a hydrogen beam at ETH Zurich. The experimental
setup and the current status will be presented.

[1] P. Pérez et al., “The GBAR antimatter gravity experiment,” Hyperfine
Interactions 233, 21–27 (2015)
[2] P. Crivelli et al., "Antiproton charge radius", Phys.Rev. D94 (2016)
no.5, 052008 (2016)

Primary author

Gianluca Janka (ETH Zürich)


Ryoma Nishi (University of Tokyo) Amit Nanda (Stefan Meyer Institute) Naofumi Kuroda (University of Tokyo) Martin Simon (Stefan Meyer Institute) Eberhard Widmann (Stefan Meyer Institute) Paolo Crivelli (Institute for Particle Physics, ETH Zurich)

Presentation materials