Testing the Weak Equivalence Principle with an antimatter beam at CERN

Abstract : The goal of the AEgIS experiment is to measure the gravitational acceleration of antihydrogen ? the simplest atom consisting entirely of antimatter ? with the ultimate precision of 1%. We plan to verify the Weak Equivalence Principle (WEP), one of the fundamental laws of nature, with an antimatter beam. The experiment consists of a positron accumulator, an antiproton trap and a Stark accelerator in a solenoidal magnetic field to form and accelerate a pulsed beam of antihydrogen atoms towards a free-fall detector. The antihydrogen beam passes through a moir? deflectometer to measure the vertical displacement due to the gravitational force. A position and time sensitive hybrid detector registers the annihilation points of the antihydrogen atoms and their time-of-flight. The detection principle has been successfully tested with antiprotons and a miniature moir? deflectometer coupled to a nuclear emulsion detector.
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M Kimura, S Aghion, C Amsler, A Ariga, T Ariga, et al.. Testing the Weak Equivalence Principle with an antimatter beam at CERN. 4th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2014), Dec 2014, Londres, United Kingdom. pp.012047, ⟨10.1088/1742-6596/631/1/012047⟩. ⟨in2p3-01186113⟩

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