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Ole Rømer Colloquium: David Milstead

Join us when David Milstead from Stockholm University visits us

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Info about event


Thursday 13 June 2024, at 14:00 - Monday 27 May 2024, at 15:45



David Milstead will give a talked titled: 

Search for baryon number violation with the HIBEAM 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; 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 origin 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. A conceptual design report, funded by European Union, for the NNBAR stage has been published. A similar paper for the HIBEAM stage will be complete in 2024.