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19962025
most citedObservation of a Broad Structure in the Mass Spectrum around 4.26 GeV/

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hep-ex2025

European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment

PIONEER Collaboration, A. Adelmann, W. Altmannshofer +76

PIONEER is a rapidly developing effort aimed to perform a pristine test of lepton flavour universality (LFU) and of the unitarity of the first row of the CKM matrix by significantl…