1. General Seminars

Search for Baryon Number Violation at European Spallation Source (ESS)

by Yuri Kamyshkov (Tennessee Univ., USA)

Aula Direzione (LNF INFN)

Aula Direzione


Via Enrico Fermi, 40 00044 Frascati
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.