LABORATORI NAZIONALI DI FRASCATI
Speaker: Yuri Kamyshkov (University of Tennessee, USA) Neutron can be a Majorana particle as was originally conjectured by E. Majorana. It might reveal its nature in the transformation of neutron to antineutron that would be a signal of Baryon number violation with Delta B=2. Violation of Baryon number is required both by the mechanism of inflation and for generation of matter-antimatter asymmetry in the universe. More than 1000 times an improvement can be made in the sensitivity of neutron-antineutron search at the new European Spallation Source (ESS) to be constructed by the end of this decade near Lund in Sweden. A new N-Nbar search Collaboration is presently being formed in Europe to perform this spectacular search at ESS with slow neutron beam of high intensity. If neutron-antineutron transformation will be found, it will provide a mechanism for the generation of baryon asymmetry of the universe at the post-sphaleron scale, thus making a testable alternative to untestable idea of leptogenesis. Such a mechanism can also reveal itself with an observation of new heavy scalar states at LHC. New Collaboration plans to build at ESS a detector for neutron-antineutron transformation search, where new experimental groups are welcome to participate and contribute.

DATA: 24-06-2014