Search for massive neutrinos in the decay $\ensuremath{\pi}\ensuremath{\rightarrow}e\ensuremath{\nu}$

Search for massive neutrinos in the decay $π \to e ν$

M. Aoki, M. Blecher, D. A. Bryman, S. Chen, M. Ding, L. Doria, P. Gumplinger, C. Hurst, A. Hussein, Y. Igarashi, N. Ito, S. H. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, T. Numao, R. Poutissou, A. Sher, T. Sullivan, D. Vavilov, K. Yamada, and M. Yoshida (PIENU Collaboration)

Phys. Rev. D 84, 052002 – Published 6 September 2011

Abstract

Evidence of massive neutrinos in the $π^{+} \to e^{+} ν$ decay spectrum was sought with the background $π^{+} \to μ^{+} \to e^{+}$ decay chain highly suppressed. Upper limits (90% C.L.) on the neutrino mixing matrix element $| U_{e i} |^{2}$ in the neutrino mass region $60 - 129 MeV / c^{2}$ were set at the level of $10^{- 8}$ .

Received 20 June 2011

DOI:https://doi.org/10.1103/PhysRevD.84.052002

Authors & Affiliations

M. Aoki¹, M. Blecher², D. A. Bryman³, S. Chen⁴, M. Ding⁴, L. Doria⁵, P. Gumplinger⁵, C. Hurst³, A. Hussein⁶, Y. Igarashi⁷, N. Ito¹, S. H. Kettell⁸, L. Kurchaninov⁵, L. Littenberg⁸, C. Malbrunot³, T. Numao⁵, R. Poutissou⁵, A. Sher⁵, T. Sullivan³, D. Vavilov⁵, K. Yamada¹, and M. Yoshida¹ (PIENU Collaboration)

¹Physics Department, Osaka University, Toyonaka, Osaka, 560-0043, Japan
²Virginia Tech., Blacksburg, Virginia, 24061, USA
³Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C., V6T 1Z1, Canada
⁴Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
⁵TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3, Canada
⁶University of Northern British Columbia, Prince George, B.C., V2N 4Z9, Canada
⁷KEK, 1-1 Oho, Tsukuba-shi, Ibaraki, 305–0801, Japan
⁸Brookhaven National Laboratory, Upton, New York, 11973-5000, USA

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Vol. 84, Iss. 5 — 1 September 2011

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Physical Review D

covering particles, fields, gravitation, and cosmology

Search for massive neutrinos in the decay $π \to e ν$

M. Aoki, M. Blecher, D. A. Bryman, S. Chen, M. Ding, L. Doria, P. Gumplinger, C. Hurst, A. Hussein, Y. Igarashi, N. Ito, S. H. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, T. Numao, R. Poutissou, A. Sher, T. Sullivan, D. Vavilov, K. Yamada, and M. Yoshida (PIENU Collaboration)

Phys. Rev. D 84, 052002 – Published 6 September 2011

Abstract

Authors & Affiliations

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Physical Review D

covering particles, fields, gravitation, and cosmology

Search for massive neutrinos in the decay π→eν

M. Aoki, M. Blecher, D. A. Bryman, S. Chen, M. Ding, L. Doria, P. Gumplinger, C. Hurst, A. Hussein, Y. Igarashi, N. Ito, S. H. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, T. Numao, R. Poutissou, A. Sher, T. Sullivan, D. Vavilov, K. Yamada, and M. Yoshida (PIENU Collaboration)

Phys. Rev. D 84, 052002 – Published 6 September 2011

Abstract

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Search for massive neutrinos in the decay $π \to e ν$