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Search for Massive Neutrinos in the Decay pi --> e nu

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arxiv 1106.4055 v1 pith:N2RKFHON submitted 2011-06-20 hep-ex

Search for Massive Neutrinos in the Decay pi --> e nu

PIENU Collaboration: M. Aoki , M. Blecher , D.A. Bryman , S. Chen , M. Ding , L. Doria , P. Gumplinger , C. Hurst
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A. Hussein Y. Igarashi N. Ito S.H. Kettell L. Kurchaninov L. Littenberg C. Malbrunot T. Numao R. Poutissou A. Sher T. Sullivan K. Yamada M. Yoshida D. Vavilov
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Evidence 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 |U_ei|^2 in the neutrino mass region 60--129 MeV/c^2 were set at the level of 10^-8.

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