Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 54: Axion like particles I

T 54.6: Talk

Wednesday, April 1, 2020, 17:45–18:00, H-HS XV

KWISP - Hunting Chameleons at the CAST Experiment at CERN — •Justin Baier, Horst Fischer, and Marc Schumann — Albert-Ludwigs-Universität Freiburg

The KWISP (Kinetic Weakly Interacting Slim Particle) detector is part of the CAST experiment at CERN exploring the dark sector. It utilizes an ultra-sensitive opto-mechanical force sensor for the search for solar chameleons. Chameleons are hypothetical scalar particles postulated as dark energy candidates, which have a direct coupling to matter depending on the local density. Considering these characteristics a flux of solar chameleons hitting a solid surface at grazing incidence will, under certain conditions, reflect and exert the equivalent of a radiation pressure. To exploit this trait the KWISP sensor consists of a thin and rigid dielectric membrane placed inside a resonant optical cavity. First results have been published and will be presented in this talk. Meanwhile, various detector upgrades have been implemented, which will be discussed as well.