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Fundamental Physics with Antihydrogen Atoms

Jonahan Wurtele

The ALPHA Collaboration at CERN has combined antiprotons and positrons to create and probe antihydrogen atoms. ALPHA can now store over 1000 antihydrogen atoms at a time for thousands of seconds.  We have developed techniques to conduct precision physics using minimal numbers of antiatoms. The comparison of antihydrogen and hydrogen spectra are sensitive probes of Charge-Parity-Time (CPT) Symmetry. We have conducted the first precision physics experiments on antihydrogen, measuring the 1S-2S and the hyperfine transition bandwidths to the 10kHz level. The charge of antihydrogen has been limited to less than 0.7ppb of the magnitude of the electron charge, and the Lyman-alpha transition, critical for laser cooling, has been excited. A gravity experiment designed to measure antihydrogen acceleration in the Earth’s field to 1% accuracy is being constructed. In this talk I will describe ALPHAs techniques, physics results, and our plans for the future.

Speaker: Johathan Wurtele, UC Berkeley

Monday, 04/15/19


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