Constraints on exotic spin-dependent interactions between matter and antimatter from antiprotonic helium spectroscopy

Abstract

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.

10 pages, 6 figures, 3 appendices

References in corpus (4)

• Spin-Dependent Macroscopic Forces from New Particle Exchange
• Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy
• Probing low-mass vector bosons with parity nonconservation and nuclear anapole moment measurements in atoms and molecules
• First observation of two hyperfine transitions in antiprotonic He-3

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