Low Energy Particle Physics - Fundamental Interactions Group

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PIONEER

Detector concept of the PIONEER experiment
Detector concept of the PIONEER experiment: An active target inside a spherical liquid xenon calorimeter.
First PIONEER beam test at PSI, May 2022
First PIONEER beam test at PSI, May 2022: End of the beamline, where the beam enters the air through a window and then hits various detectors.

external page PIONEER is a newly approved, next-generation precision pion decay experiment at external page PSI testing lepton flavour universality. Measurement of the charged-pion branching ratio to electrons vs. muons is extremely sensitive to a wide variety of new physics effects. In a second phase, measurement of the rare process of pion beta decay, $$ \pi^+ \rightarrow \pi_0 + e^+ + \nu(\gamma) $$ will test CKM unitarity.

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