There are a lot of composite particles containing b quarks, and their decay is interesting (the LHC even has a dedicated experiment to study them, @LHCbExperiment). But are there undiscovered particles (for example, extra undiscovered neutrinos) hiding in those B meson decays? #CMSPaper 1291 checks, and did not see any. https://arxiv.org/abs/2403.04584
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