Description
The European Spallation Source will open a new intensity frontier
in particle physics. The two-stage HIBEAM/NNBAR program can exploit
the potential of the ESS with a series of high-precision searches and
measurements. A key part of the program is the first search for over
thirty years for free neutrons converting to antineutrons, thereby testing
baryon number conservation. A discovery sensitivity, compared with
earlier work, of three orders of magnitude is possible. In addition to
neutron-antineutron conversions, the HIBEAM/NNBAR program has a
broad potential, including, for example, high-sensitivity searches for ultralight
axion-like particles (ALPs) and sterile neutrons. Modifications to a
beamline of HIBEAM design allow highly sensitive measurements of neutron
decay and a search for a non-zero neutron electric dipole moment.
