Mainz 2017 – scientific programme

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SYAM: Symposium Atomic Anti-Matter Physics

SYAM 2: Atomic Anti-Matter Physics II

SYAM 2.2: Invited Talk

Thursday, March 9, 2017, 15:00–15:30, P 1

Antihydrogen physics at ASACUSA and AEGIS — •Chloé Malbrunot — CERN, Geneva, Switzerland

A growing number of collaborations are performing experiments at the CERN Antiproton Decelerator (AD), the only available facility providing slow antiprotons suitable for precision measurements with anti-atoms. The majority of these experiments are forming antihydrogen atoms with the main goal of probing their atomic transitions which have been measured in hydrogen to a remarkable precision. The precise comparison between the hydrogen and antihydrogen transitions has indeed the potential to provide one of the most sensitive tests of CPT symmetry. More recently, experiments have begun to employ antihydrogen atoms to test the validity of the Weak Equivalent Principle on antimatter by measuring the fall of these anti-atoms in the Earth's gravitational field. The ASACUSA-CUSP and AEGIS collaborations are both aiming at forming a cold beam of antihydrogen atoms in order to measure their ground-state hyperfine splitting (ASACUSA) and free fall in the Earth gravitational field (AEGIS) in an electromagnetic field-free region. After shortly describing the experimental setups adopted by those collaborations and discussing their respective sensitivities, I will highlight the latest developments and the upcoming experimental challenges towards CPT and gravity tests with antihydrogen atoms.