EXA2011

Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms...

ATRAP continues to pursue the idea, enunciated back in 1987, to trap enough cold antihydrogen atoms for precise spectroscopic comparisons of antihydrogen and hydrogen atoms. Embedded electron cooling and adiabatic cooling methods have been developed to cool millions of antiprotons to below 3 K, to facilitate the production of cold antihydrogen.

After the first production of cold antihydrogen by the ATHENA and ATRAP collaborations, second generation experiments are being performed for measuring the fundamental properties of this antiatom. AEGIS (Antimatter Experiment:Gravity, Interferometry, Spectroscopy) is an experiment with the goal of measuring the gravitational interaction between matter and antimatter with help of a pulsed,...

ASACUSA collaboration has been making a path to realize high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atom in flight for stringent test of the CPT symmetry. Recently, we have succeeded in synthesizing our first cold anithydrogen atoms employing a CUSP trap. It is expected that synthesized antihydrogen atoms in the low-field-seeking states...

A number of approaches to physics beyond the Standard Model can accommodate minuscule violations of CPT invariance. Since CPT symmetry can be measured with ultrahigh precision, CPT tests offer an interesting phenomenological avenue to search for underlying physics. I discuss this line of reasoning in more detail, comment on the connection between CPT and Lorentz invariance, and review how...