Precision tests of electron-muon universality with pions

T. Numao; A. Aguilar-Arevalo; M. Aoki; M. Blecher; D. I. Britton; D. A. Bryman; S. Chen; J. Comfort; M. M. Ding; L. Doria; P. Gumplinger; A. Hussein; Y. Igarashi; S. H. Kettell; L. Kurchaninov; L. Littenberg; C. Malbrunot; A. Sher; T. Sullivan; V. Vavilov; Y. Yoshida; K. Yamada

doi:10.1393/ncc/i2012-11286-5

Precision tests of electron-muon universality with pions

T. Numao, A. Aguilar-Arevalo, M. Aoki, M. Blecher, D. I. Britton, D. A. Bryman, S. Chen, J. Comfort, M. M. Ding, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, S. H. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, A. Sher, T. Sullivan, V. VavilovY. Yoshida, K. Yamada

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The TRIUMF PIENU experiment aims to measure the branching ratio of pion decays, R_e/μ = Γ(π → eν(γ))/Γ(π → μν(γ)), at a precision level of < 0.1%, confronting the Standard Model (SM) prediction of R^SM _e/μ = 1.2353(1) × 10^-4. At that level, new physics beyond the SM involving mass scales up to 1000TeV may be heralded by an observed deviation from the precise SM expectation. Also, evidence of massive neutrinos in the π⁺ → e⁺ν decay spectrum has been sought with the background from π⁺ → μ⁺ → e⁺ decay chain highly suppressed. Upper limits (90% C.L.) on the neutrino mixing matrix element |U_ei|² in the mass region 65-130 MeV/c² have been set at a 10^-8 level.

Original language	English (US)
Pages (from-to)	63-67
Number of pages	5
Journal	Nuovo Cimento della Societa Italiana di Fisica C
Volume	35
Issue number	4
DOIs	https://doi.org/10.1393/ncc/i2012-11286-5
State	Published - 2012

ASJC Scopus subject areas

Astronomy and Astrophysics
Physics and Astronomy (miscellaneous)

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Numao, T., Aguilar-Arevalo, A., Aoki, M., Blecher, M., Britton, D. I., Bryman, D. A., Chen, S., Comfort, J., Ding, M. M., Doria, L., Gumplinger, P., Hussein, A., Igarashi, Y., Kettell, S. H., Kurchaninov, L., Littenberg, L., Malbrunot, C., Sher, A., Sullivan, T., ... Yamada, K. (2012). Precision tests of electron-muon universality with pions. Nuovo Cimento della Societa Italiana di Fisica C, 35(4), 63-67. https://doi.org/10.1393/ncc/i2012-11286-5

Numao, T, Aguilar-Arevalo, A, Aoki, M, Blecher, M, Britton, DI, Bryman, DA, Chen, S, Comfort, J, Ding, MM, Doria, L, Gumplinger, P, Hussein, A, Igarashi, Y, Kettell, SH, Kurchaninov, L, Littenberg, L, Malbrunot, C, Sher, A, Sullivan, T, Vavilov, V, Yoshida, Y & Yamada, K 2012, 'Precision tests of electron-muon universality with pions', Nuovo Cimento della Societa Italiana di Fisica C, vol. 35, no. 4, pp. 63-67. https://doi.org/10.1393/ncc/i2012-11286-5

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abstract = "The TRIUMF PIENU experiment aims to measure the branching ratio of pion decays, Re/μ = Γ(π → eν(γ))/Γ(π → μν(γ)), at a precision level of < 0.1%, confronting the Standard Model (SM) prediction of RSM e/μ = 1.2353(1) × 10-4. At that level, new physics beyond the SM involving mass scales up to 1000TeV may be heralded by an observed deviation from the precise SM expectation. Also, evidence of massive neutrinos in the π+ → e+ν decay spectrum has been sought with the background from π+ → μ+ → e+ decay chain highly suppressed. Upper limits (90% C.L.) on the neutrino mixing matrix element |Uei|2 in the mass region 65-130 MeV/c2 have been set at a 10-8 level.",

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AU - Numao, T.

AU - Aguilar-Arevalo, A.

AU - Aoki, M.

AU - Blecher, M.

AU - Britton, D. I.

AU - Bryman, D. A.

AU - Chen, S.

AU - Comfort, J.

AU - Ding, M. M.

AU - Doria, L.

AU - Gumplinger, P.

AU - Hussein, A.

AU - Igarashi, Y.

AU - Kettell, S. H.

AU - Kurchaninov, L.

AU - Littenberg, L.

AU - Malbrunot, C.

AU - Sher, A.

AU - Sullivan, T.

AU - Vavilov, V.

AU - Yoshida, Y.

AU - Yamada, K.

PY - 2012

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Precision tests of electron-muon universality with pions

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