Abstract

The AEḡIS collaboration’s main goal is to measure the acceleration of antihydrogen () due to gravity. The experimental scheme is to form a pulsed beam whose vertical deflection is then measured by means of a moiré deflectometer [1]. Creating pulsed is crucial since it allows a velocity measurement of the antiatoms via time of flight (ToF) necessary to deduce the gravitational acceleration ḡ from the vertical deflection Δs. The aim of this article is to outline the experimental protocol leading up to pulsed antihydrogen production in the AEḡIS experiment.

Highlights

  • The matter antimatter imbalance in the visible part of our universe has been cause for an abundance of hypotheses [2, 3, 4, 5], of which some assume a breaking of the WEP or CPT (Charge, Parity and Time reversal) symmetry [6]

  • The WEP is one of the pillars of the theory of General Relativity (GR) and the Standard Model (SM) of particle physics relies on CPT symmetry

  • In this article we have given an overview of the experimental protocol leading up to pulsed antihydrogen formation through charge exchange

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Summary

Introduction

The matter antimatter imbalance in the visible part of our universe has been cause for an abundance of hypotheses [2, 3, 4, 5], of which some assume a breaking of the WEP (weak equivalence principle) or CPT (Charge, Parity and Time reversal) symmetry [6]. To help resolve speculations as to the cause of the baryon asymmetry, experiments try and shed more light on the open questions of whether the WEP and/or CPT symmetry experience violations [7, 8, 9]. In the low-energy antimatter collaborations based at CERN (Conseil Europeen pour la Recherche Nucleaire) the lightest stable antiatom – antihydrogen (H ) – is at the heart of many experiments probing for (minimal) violations of the WEP and CPT symmetry. Among the experiments testing for WEP [10, 11] is the AEgIS collaboration with the experimental pursuit of probing how antihydrogen ‘falls’ in the gravitational field of Earth

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