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Ficek, Filip; Fadeev, Pavel; Flambaum, Victor V.; Kimball, Derek F. Jackson; Kozlov, Mikhail G.; Stadnik, Yevgeny; Budker, Dmitry (2018): Constraints on Exotic Spin-Dependent Interactions Between Matter and Antimatter from Antiprotonic Helium Spectroscopy. In: Physical Review Letters, Vol. 120, No. 18, 183002
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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.