Expression of Interest: Rare Eta Decays with a TPC for Optical Photons
The REDTOP experiment is primarily intended to look for new violations of basic symmetry principles and conservation laws in particle physics. Our main focus will be on very rare decays of the η meson. From the Standard Model and other theories, such decays can provide distinct insights into the limits of conservation laws and open unique doors to new ones at branching ratio sensitivity levels typically below 10 -9 . Notably, current experimental upper limits for η decays are many orders of magnitude larger. The sensitivity goal of our experiment is expected to be better than 10 -10 for most decay modes, based on an estimated yield of more than 10 12 η mesons per year. Numerous opportunities for new physics Beyond the Standard Model will become available.