Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy
classification
⚛️ physics.atom-ph
keywords
interactionsexoticspin-dependentantimatterantiprotonicheliummatterantiprotons
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Heretofore undiscovered spin-0 or spin-1 bosons can mediate exotic spin-dependent interactions between standard-model particles. Here we carry out the first search for semileptonic spin-dependent interactions between matter and antimatter. We compare theoretical calculations and spectroscopic measurements of the hyperfine structure of antiprotonic helium to constrain exotic spin- and velocity-dependent interactions between electrons and antiprotons.
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