Measurement of the Pion Branching Ratio at TRIUMF
- Malbrunot, C.
- Aguilar-Arevalo, A.A.
- Aoki, M.
- Blecher, M.
- Britton, D.I.
- Bryman, D.A.
- Chen, S.
- Comfort, J.
- Ding, M.
- Doria, L.
- Gumplinger, P.
- Hussein, A.
- Igarashi, Y.
- Ito, S.
- Kettell, S.H.
- Kuno, Y.
- Kurchaninov, L.
- Littenberg, L.
- Numao, T.
- Sher, A.
- Sullivan, T.
- Vavilov, D.
- Yoshida, M.
DOIAbstract
The branching ratio of pion decays, RJ = J is one of the most accurately calculated decay processes involving hadrons and has provided one of the most stringent tests of the hypothesis of electron-muon universality in weak interactions. The current experimental branching ratio RexpJ = J(1.230+-0.004)Oe10-'4 is 40 times less precise than the theoretical prediction RSMJ = J1.2352(1)10-'4. The TRIUMF PIENU experiment aims at measuring the pion branching ratio with a precision improved by at least a factor five
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