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

Addazi, A. and Anderson, K. and Ansell, S. and Babu, K. S. and Barrow, J. L. and Baxter, D. V. and Bentley, P. M. and Berezhiani, Z. and Bevilacqua, R. and Biondi, R. and Bohm, C. and Brooijmans, G. and Broussard, L. J. and Cedercäll, J. and Crawford, C. and Dev, P. S. B. and DiJulio, D. D. and Dolgov, A. D. and Dunne, K. and Fierlinger, P. and Fitzsimmons, M. R. and Fomin, A. and Frost, M. J. and Gardiner, S. and Gardner, S. and Galindo-Uribarri, A. and Geltenbort, P. and Girmohanta, S. and Golubev, P. and Golubeva, E. and Greene, G. L. and Greenshaw, T. and Gudkov, V. and Hall-Wilton, R. and Heilbronn, L. and Herrero-Garcia, J. and Holley, A. and Ichikawa, G. and Ito, T. M. and Iverson, E. and Johansson, T. and Jönsson, L. and Jwa, Y.-J. and Kamyshkov, Y. and Kanaki, K. and Kearns, E. and Kokai, Z. and Kerbikov, B. and Kitaguchi, M. and Kittelmann, T. and Klinkby, E. and Kobakhidze, A. and Koerner, L. W. and Kopeliovich, B. and Kozela, A. and Kudryavtsev, V. and Kupsc, A. and Lee, Y. T. and Lindroos, M. and Makkinje, J. and Marquez, J. I. and Meirose, B. and Miller, T. M. and Milstead, D. and Mohapatra, R. N. and Morishima, T. and Muhrer, G. and Mumm, H. P. and Nagamoto, K. and Nepomuceno, A. and Nesti, F. and Nesvizhevsky, V. V. and Nilsson, T. and Oskarsson, A. and Paryev, E. and Pattie, R. W. and Penttil, S. and Perrey, H. and Pokotilovski, Y. N. and Potashnikovav, I. and Ramic, K. and Redding, C. and Richard, J.-M. and Ries, D. and Rinaldi, E. and Rizzi, N. and Rossi, N. and Ruggles, A. and Rybolt, B. and Santoro, V. and Sarkar, U. and Saunders, A. and Senjanovic, G. and Serebrov, A. P. and Shimizu, H. M. and Shrock, R. and Silverstein, S. and Silvermyr, D. and Snow, W. M. and Takibayev, A. and Tkachev, I. and Townsend, L. and Tureanu, A. and Varriano, L. and Vainshtein, A. and de Vries, J. and Wagner, R. and Woracek, R. and Yamagata, Y. and Yiu, S. and Young, A. R. and Zanini, L. and Zhang, Z. and Zimmer, O. (2021) New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source. Journal of Physics G: Nuclear and Particle Physics, 48 (7). Art. No. 070501. ISSN 0954-3899. doi:10.1088/1361-6471/abf429.

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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) via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (n → [n',n'] → n), and neutron disappearance (n → n'); the effective ΔB = 0 process of neutron regeneration (n → [n',n'] → 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.

Item Type:Article
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URLURL TypeDescription Paper
Broussard, L. J.0000-0001-9182-2808
Milstead, D.0000-0002-7788-4129
Alternate Title:New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source
Additional Information:© 2021 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 10 February 2021; Accepted for publication 1 April 2021; Published 14 June 2021. D Milstead gratefully acknowledges support from the Swedish Research Council. The work of Z Berezhiani is supported in part by CETEMPs at the University di L'Aquila. The work of Y Kamyshkov was supported in part by US DOE Grant DE-SC0014558. The work of S Girmohanta and R Shrock is supported in part by US NSF Grant NSF-PHY-1915093. The work of L Varriano is supported by a US National Science Foundation (NSF) Graduate Research Fellowship under Grant No. DGE-1746045. B Kerbikov is supported by RSF Grant 16-12-10414. Rabrindra Mohapatra gratefully acknowledges support from the NSF via the Grant: PHY-1914631. B Kopeliovich and I Potashnikova acknowledge Grants ANID—Chile FONDECYT 1170319, and ANID PIA/APOYO AFB180002. A Young is supported by the NSF Grant PHY-1914133 and the DOE Grant DE-FG02-ER41042. W M Snow acknowledges support from US National Science Foundation Grant PHY-1914405 and the Indiana University Center for Spacetime Symmetries. J L Barrow's work was supported by the US Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under Contract No. DESC0014664. J L Barrow was also partially supported in part by the Visiting Scholars Award Program of the Universities Research Association. The work of P S B Dev is supported in part by the US Department of Energy under Grant No. DE-SC0017987, by the Neutrino Theory Network Program Grant No. DE-AC02-07CHI11359, and by a Fermilab Intensity Frontier Fellowship. L J Broussard is supported by the US DOE under Contract DE-AC05-00OR2272. This work is also funded by the European Union Framework Program for Research and Innovation Horizon 2020 in the HighNESS project, under Grant Agreement 951782. Data availability statement: The data that support the findings of this study are available upon reasonable request from the authors.
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Swedish Research CouncilUNSPECIFIED
University di L'AquilaUNSPECIFIED
Department of Energy (DOE)DE-SC0014558
NSF Graduate Research FellowshipDGE-1746045
Russian Science Foundation16-12-10414
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1170319
Agencia Nacional de Investigación y Desarrollo (ANID)AFB180002
Department of Energy (DOE)DE-FG02-ER41042
Indiana UniversityUNSPECIFIED
Department of Energy (DOE)DE-SC0014664
Universities Research AssociationUNSPECIFIED
Department of Energy (DOE)DE-SC0017987
Department of Energy (DOE)DE-AC02-07CHI11359
Department of Energy (DOE)DE-AC05-00OR2272
European Research Council (ERC)951782
Issue or Number:7
Record Number:CaltechAUTHORS:20210629-150653999
Persistent URL:
Official Citation:A Addazi et al 2021 J. Phys. G: Nucl. Part. Phys. 48 070501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109638
Deposited By: Tony Diaz
Deposited On:29 Jun 2021 16:10
Last Modified:29 Jun 2021 16:10

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