A new experimental method to search for T-violation using a sequential CeF3 scintillating calorimeter

Abstract A new experimental method to search for T -violating transverse muon polarization ( P T ) in the K + → π 0 μ + ν ( K μ 3 ) decay is proposed. In this new experiment, the measurements of the μ + momentum vector, the π 0 momentum vector, and the μ + polarization will be performed by the same electro-magnetic calorimeter. One of key issues is the choice of a scintillation material which can preserve the μ + spin polarization for several μ + lifetimes. A test experiment to measure the residual μ + polarization in a Ce F 3 scintillating crystal was performed at J-PARC Material and Life Science Facility (MLF). We concluded that the residual μ + polarization in Ce F 3 is high enough to perform the new T -violation experiment.