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HK: Fachverband Hadronen und Kerne

HK 51: Fundamental Symmetries

HK 51.1: Invited Group Report

Wednesday, March 18, 2009, 14:00–14:30, H-ZO 70

Antihydrogen — •Jochen Walz — Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz

Future precision experiments with trapped cold antihydrogen promise to provide extremely stringent tests of the fundamental CPT symmetry in the hadron as well as in the lepton sector. Ultrahigh-resolution Doppler-free two-photon laser-spectroscopy of ordinary hydrogen and antihydrogen might be used to compare matter and antimatter at unprecedented levels of experimental accuracy. In addition, there is the fascinating prospect to directly observe the gravitational force on antimatter, because antihydrogen is a pure antimatter system which is both stable and electrically neutral.

Current antihydrogen experiments use the Antiproton Decelerator (AD) at CERN and this talk will review the status of the ATRAP experiment. An exciting new horizon is FLAIR, the Facility for Low-energy Antiproton and Ion Research. This is a next-generation low-energy antiproton source that will make use of the high flux of antiprotons at the upcoming international FAIR research center near GSI/Darmstadt.