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Experimental measurement of the probability of direct decay of a pion into apositron allows searching for interactions beyond the Standard Model: test ofthe hypothesis about the universality of the charged current,search for newPseudo-scalar Interactions. A setup based on plastic scintillators and siliconphotomultipliers for measuring pion and muon energy losses without measuringthe decay positron energy is proposed and analysed. It is shown that theaccuracy of measuring the branching ratio of direct pion decay into positroncan be improved fourfold. The pion lifetime measured only for decay a pion intoa muon.For the first time, a project proposed to measure the lifetime of a pionduring direct decay pion into positron with an accuracy of better than 7 ppm.

Proposal to measure with high precision branching ratio of direct pion decay into positron and pion mean life