Speaker
Dr
Chloé Malbrunot
(CERN)
Description
The goal of the ASACUSA CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. The collaboration has recently succeeded in detecting 80 antihydrogen atoms 2.7 meters away from their production trap in a magnetic field free region [1]. This successful detection constitutes a milestone toward precision spectroscopy of antimatter atoms in a beam. In parallel to the progress on the antihydrogen production, the spectroscopy beamline has been tested with a source of hydrogen. This led to the most precise measurement of the hydrogen hyperfine splitting in a beam (ppm level) [2]. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold anti atoms in ground state. However, a measurement of the hyperfine splitting of antihydrogen 3 orders of magnitude worse than what was achieved with the same spectroscopy setup with hydrogen would already provide a stringent test of CPT symmetry. My talk will present the latest developments and results with an emphasis on the spectroscopy apparatus. The coming years program will also be discussed.
[1] N. Kuroda et al., Nature Commun. 5, 3089 (2014).
[2] Diermaier et al., to be published
Primary author
Dr
Chloé Malbrunot
(CERN)
