4.4 Article

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1361-6471/abf429

关键词

baryon number violation; feebly interacting particles; European Spallation Source; baryogenesis

资金

  1. Swedish Research Council
  2. CETEMPs at the University di L'Aquila
  3. US DOE [DE-SC0014558, DE-AC05-00OR2272]
  4. US NSF [NSF-PHY-1915093]
  5. US National Science Foundation (NSF) Graduate Research Fellowship [DGE-1746045]
  6. RSF [16-12-10414]
  7. NSF [PHY-1914631, PHY-1914133]
  8. ANID-Chile [FONDECYT 1170319]
  9. ANID PIA/APOYO [AFB180002]
  10. DOE [DE-FG02-ER41042, DESC0014664]
  11. US National Science Foundation [PHY-1914405]
  12. Indiana University Center for Spacetime Symmetries
  13. US Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program
  14. Visiting Scholars Award Program of the Universities Research Association
  15. US Department of Energy [DE-SC0017987]
  16. Neutrino Theory Network Program [DE-AC02-07CHI11359]
  17. Fermilab Intensity Frontier Fellowship
  18. European Union Framework Program for Research and Innovation Horizon 2020 in the HighNESS project [951782]
  19. U.S. Department of Energy (DOE) [DE-SC0014558] Funding Source: U.S. Department of Energy (DOE)

向作者/读者索取更多资源

The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation, aiming to discover and characterize mixing in the neutron, antineutron, and sterile neutron sectors. This experiment addresses open questions related to baryogenesis, dark matter, and new physics scales, and has the potential to significantly increase sensitivity in neutron conversion probability tests.
The violation of baryon number, B, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation (n -> (n) over bar) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state (n -> [n',(n) over bar'] -> (n) over bar), and neutron disappearance (n -> n'); the effective Delta B = 0 process of neutron regeneration (n ->[n',(n) over bar'] -> n) is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis and the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

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