Parity-conjugated copies of standard model particles, so-called mirror particles, could provide answers for several standing issues in physics, and in particular they can be viable candidates for dark matter. The ordinary neutral particles (e.g. neutrinos or the neutron) can have mixing with their mirror twins, with interesting phenomenological and astrophysical implications. Our experiment at the Paul Scherrer Institute (PSI) was designed to search for anomalous disappearance of ultracold neutrons (UCN) that could hint towards neutron-to-mirror-neutron oscillations. The experiment was conducted in a controlled magnetic field, scanning from 5 muT to 100 muT. I provide an overview of the experiment, its data analysis based on Monte Carlo simulations and precise magnetic field maps, and present new limits on the oscillation time.
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Geza Zsigmond
Paul Scherrer Institute (PSI), Switzerland
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