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Doria, L. Gibbons, M. Escobar Godoy, M. Hoferichter, M. Tarka, M. Worcester, PIONEER Collaboration: W. Altmannshofer, P. Kammel, P. Schwendimann, R. Mischke, R. Roehnelt, R. Shrock, S. Chen, S. Corrodi, S. Cuen-Rochin, S. Gori, S. Ito, S. Mihara, S.M. Mazza, T. Gorringe, T. Iwamoto, T. Mori, T. Numao, T. Sullivan, U. Langenegger, V. Cirigliano, V. Tischenko, V. Wong, W. Ootani, X. Qian, Z. Hodge","submitted_at":"2022-03-10T17:49:50Z","abstract_excerpt":"The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs.\\ muons, $R_{e/\\mu}$, 15 times more precisely than the current experimental result, reaching the precision of the Standard Model (SM) prediction at 1 part in $10^4$. 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