New High-Sensitivity Searches for Neutrons Converting into Antineutrons And/or Sterile Neutrons at the HIBEAM/NNBAR Experiment at the European Spallation Source

The violation of baryon number, 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 via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state , and neutron disappearance (n → n′); the effective process of neutron regeneration 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

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

The violation of baryon number, 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 via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state , and neutron disappearance (n → n′); the effective process of neutron regeneration 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.Fil: Addazi, A.. Istituto Nazionale Di Fisica Nucleare; Alemania. Universitat Technical Zu Munich; AlemaniaFil: Anderson, K.. Oak Ridge National Laboratory; Estados UnidosFil: Ansell, S.. Max Iv Laboratory; SueciaFil: Babu, K.S.. Oklahoma State University; Estados UnidosFil: Barrow, J. L.. University of Tennessee; Estados UnidosFil: Baxter, D. V.. Indiana University; Estados UnidosFil: Bentley, P.M.. European Spallation Source Eric; SueciaFil: Berezhiani, Z.. Laboratori Nazionali del Gran Sasso; Italia. Università Degli Studi Dell'aquila; ItaliaFil: Bevilacqua, R.. European Spallation Source Eric; SueciaFil: Biondi, R.. Laboratori Nazionali del Gran Sasso; ItaliaFil: Bohm, C.. Stockholms Universitet; SueciaFil: Brooijmans, G.. Stockholms Universitet; SueciaFil: Broussard, L. J.. Oak Ridge National Laboratory; Estados UnidosFil: Cederc ll, J.. Lund University; SueciaFil: Crawford, C.. University of Kentucky; Estados UnidosFil: Dev, P. S. B.. University of Washington; Estados UnidosFil: Dijulio, D. D.. European Spallation Source Eric; SueciaFil: Dolgov, A. D.. Universidad Técnica Federico Santa María; ChileFil: Dunne, K.. Stockholms Universitet; SueciaFil: Fierlinger, P.. Universitat Technical Zu Munich; AlemaniaFil: Fitzsimmons, M. R.. University of Tennessee; Estados UnidosFil: Fomin, A.. Petersburg Nuclear Physics Institute; AlemaniaFil: Frost, M. J.. Oak Ridge National Laboratory; Estados UnidosFil: Gardiner, S.. Oak Ridge National Laboratory; Estados UnidosFil: Gardner, S.. University of Kentucky; Estados UnidosFil: Galindo Uribarri, A.. Oak Ridge National Laboratory; Estados UnidosFil: Geltenbort, P.. Institut Laue Langevin; FranciaFil: Girmohanta, S.. Stony Brook University; Estados UnidosFil: Golubev, P.. Lund University; SueciaFil: Marquez Damian, Jose Ignacio. European Spallation Source ERIC; Suecia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin