Research report 2015 - Max Planck Institute of Quantum Optics

Exciting atoms containing mesons and antiprotons

Hori, Masaki
Forschungsgruppe „Antimatter Spectroscopy”
Mesons are made of two quarks; they are highly unstable forms of matter, surviving for around a billionth of a second or less. Since 2014, researchers at the MPQ have used particle accelerators located at the Paul Scherrer Institute to synthesize artificial atoms that contain these mesons: here a pion and an electron orbit the nucleus of helium atoms. For the first time, the pion mass was determined by spectroscopy with infrared laser light with a very high precision. Likewise the mass of the antiproton relative to the mass of the electron was measured with high precision at CERN.

For the full text, see the German version.

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