Virginia TechAoki, M.Blecher, MarvinBryman, D. A.Chen, S.Ding, M.Doria, L.Gumplinger, P.Hurst, C.Hussein, A.Igarashi, Y.Ito, N.Kettell, S. H.Kurchaninov, L.Littenberg, L.Malbrunot, C.Numao, T.Poutissou, R.Sher, A.Sullivan, T.Vavilov, D.Yamada, K.Yoshida, M.Pienu Collaboration2013-12-182013-12-182011-09-06Aoki, M. ; Blecher, M. ; Bryman, D. A. ; et al., SEP 6 2011. “Search for massive neutrinos in the decay pi -> e nu,” PHYSICAL REVIEW D 84(5): 052002. DOI: 10.1103/PhysRevD.84.0520021550-7998http://hdl.handle.net/10919/24733Evidence of massive neutrinos in the pi(+) -> e(+)nu decay spectrum was sought with the background pi(+) -> mu(+) -> e(+) decay chain highly suppressed. Upper limits (90% C. L.) on the neutrino mixing matrix element vertical bar U(ei)vertical bar(2) in the neutrino mass region 60-129 MeV/c(2) were set at the level of 10(-8).en-USIn Copyrightbranching ratioAstronomy & AstrophysicsPhysicsArticle - Refereedhttp://link.aps.org/doi/10.1103/PhysRevD.84.052002https://doi.org/10.1103/PhysRevD.84.052002