While the QCD axion is often considered to be necessarily light (≲eV), recent work has opened a viable and interesting parameter space for heavy axions, which solve both the strong CP and the axion quality problems. These well-motivated heavy axions, as well as the generic axionlike particles, call for explorations in the GeV mass realm at collider and beam dump environments. The primary upcoming neutrino experiment, Deep Underground Neutrino Experiment, is simultaneously also a powerful beam dump experiment, enabled by its multipurpose near detector complex. In this study, we show with detailed analyses that the Deep Underground Neutrino Experiment near detector has a unique sensitivity to heavy axions for masses between 20 MeV and 2 GeV, complementary to other future experiments.
Bibliographical noteFunding Information:
We thank Hsin-Chia Cheng, Fatih Ertas, Jan Jerhot, Felix Kahlhoefer, Gustavo Marques-Tavares and Dean Robinson for helpful discussion. K. J. K. is supported by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. S. K. was supported in part by the NSF Grants No. PHY-1914731, No. PHY-1915314 and the U.S. DOE Contract No. DE-AC02-05CH11231. Z. L. was supported in part by the NSF Grants No. PHY-1620074, No. PHY-1914480 and No. PHY-1914731, and by the Maryland Center for Fundamental Physics (MCFP). The code involved in this study are available at gitlab .
© 2021 authors. Published by the American Physical Society.