  The HIBEAM-NNBAR program is a proposed two-stage experiment at the European
Spallation Source (ESS) designed to search for baryon number violation, which
is - together with C and CP violation - one of the three fundamental Sakharov
conditions to explain the observed baryon asymmetry of the Universe. Taking
advantage of the ESS' unique capabilities as the future brightest neutron
source, the experiment will make high sensitivity searches for neutrons
converting into antineutrons and/or sterile neutrons.
