Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay π^+ rightarrow mbox{e}^+ ν

R.E. Mischke , A. Aguilar-Arevalo , M. Aoki , M. Blecher , D.I. Britton , D. vom Bruch , D.A. Bryman , S. Chen

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J. Comfort S. Cuen-Rochin L. Doria P. Gumplinger A. Hussein Y. Igarashi S. Ito S. Kettell L. Kurchaninov L.S. Littenberg C. Malbrunot T. Numao D. Protopopescu A. Sher T. Sullivan D. Vavilov

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classification ✦ hep-ex

keywords decayheavyimprovedleptonmboxneutrinosrightarrowtest

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Two results from the PIENU Experiment are presented reporting a test of lepton universality in pion decay and improved limits on heavy neutrinos coupling to positrons. The status of the full analysis for the $\pi^+ \rightarrow \mbox{e}^+ \nu$ branching ratio measurement is summarized.

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Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay π^+ rightarrow mbox{e}^+ ν

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