||Toshio Numao 教授 (カナダ TRIUMF研究所)
||Precision Test of Lepton Universality
||The electron-muon universality in weak interactions has been tested at the 0.16 % level by the measurements of the branching ratio of the decays pi-->e+nu and pi-->mu+nu. Recent theoretical calculations have suggested that the test could be further improved almost by an order of magnitude over the present level. A new experiment to improve the precision by a factor of five has been approved at TRIUMF. In this talk, the status of the expreiment will be described.