In search for rare low-mass muon resonances with the CMS experiment

Using the large collision datasets that the CMS experiment is accumulating at the Large Hadron
Collider at CERN, we propose to search for ultra-rare processes predicted by the Standard Model of
particle physics, but hitherto unobserved: the decay of the K0 meson to muons, and the dissociation
of the bound state of two muons. Both processes can yield deep theoretical insights, and have been
searched for before - now they may be observable. Powered by novelties and advances to tackle
shared challenges in data collection, simulation, and background control at low mass and
momentum, we aim to surpass prior efforts and achieve unique world-leading sensitivity for years to
come.