Precision tests of electron-muon universality with pions

被引：0

作者：

Numao, T. ^{[1
]}

Aguilar-Arevalo, A. ^{[2
]}

Aoki, M. ^{[3
]}

Blecher, M. ^{[4
]}

Britton, D. I. ^{[5
]}

Bryman, D. A. ^{[6
]}

Chen, S. ^{[7
]}

Comfort, J. ^{[8
]}

Ding, M. M. ^{[7
]}

Doria, L. ^{[1
]}

Gumplinger, P. ^{[1
]}

Hussein, A. ^{[9
]}

Igarashi, Y. ^{[10
]}

Kettell, S. H. ^{[11
]}

Kurchaninov, L. ^{[1
]}

Littenberg, L. ^{[11
]}

Malbrunot, C. ^{[6
]}

Sher, A. ^{[1
]}

Sullivan, T. ^{[6
]}

Vavilov, V. ^{[1
]}

Yoshida, Y. ^{[3
]}

Yamada, K. ^{[3
]}

机构：

[1] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[2] Univ Nacl Autonoma Mexico, Dept Fis Altas Energias, Mexico City 04510, DF, Mexico

[3] Osaka Univ, Phys Dept, Toyonaka, Osaka 5600043, Japan

[4] Virginia Tech, Phys Dept, Blacksburg, VA 24061 USA

[5] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[6] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T IZ1, Canada

[7] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[8] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

[9] Univ Northen British Columbia, Dept Phys & Astron, Prince George, BC V2N 4Z9, Canada

[10] KEK, Tsukuba, Ibaraki 3050801, Japan

[11] Brookhaven Natl Lab, Upton, NY 11973 USA

来源：

NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS | 2012年 / 35卷 / 04期

关键词：

D O I：

10.1393/ncc/i2012-11286-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The TRIUMF PIENU experiment aims to measure the branching ratio of pion decays, Re/mu = Gamma(pi -> ev(gamma))/Gamma(pi -> mu v(gamma)), at a precision level of < 0.1%, confronting the Standard Model (SM) prediction of R-e/mu(SM) = 1.2353(1) x 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 pi(+) -> e(+)v decay spectrum has been sought with the background from pi(+) -> mu(+) -> 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/c(2) have been set at a 10(-8) level.

引用

页码：63 / 67

页数：5

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