… We stopped π − in a liquid helium target, and measured the lifetime of the π − →e − ν e
mode. Since the electron energy is E e =70 MeV , there was no difficulty to detect it outside the …

The KN system at threshold is a sensitive testing ground for low energy QCD, especially for
the explicit chiral symmetry breaking. Therefore, we have measured the K-series X-rays of …

Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart—hydrogen—is
one of the most precisely investigated and best understood systems in physics …

… By assuming 19 CPT invariance, such that = M p = 1.00727646677(10) u, we can further
derive the value of m e = 0.0005485799091(7) u for the electron mass from our He + result. …

Delayed annihilation of antiprotons stopped in liquid helium has been observed, revealing
that about 3.6% of stopped antiprotons are trapped in long-lived metastable states. No …

We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which
is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the …

The Facility for Antiproton and Ion Research (FAIR) will be the accelerator-based flagship
research facility in many basic sciences and their applications in Europe for the coming …

In the search for clues to the matter–antimatter puzzle, experiments with atoms or molecules
play a particular role. These systems allow measurements with very high precision, as …

Kaonic hydrogen atoms provide a unique laboratory to probe the kaon–nucleon strong
interaction at the energy threshold, allowing an investigation of the interplay between …

A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used
to measure 12 transition frequencies of antiprotonic helium to fractional precisions of ( 9 – …