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Aguilar-Arevalo A, Aoki M, Blecher M, Britton DI, Bryman DA, Vom Bruch D, Chen S, Comfort J, Ding M, Doria L, Cuen-Rochin S, Gumplinger P, Hussein A, Igarashi Y, Ito S, Kettell SH, Kurchaninov L, Littenberg LS, Malbrunot C, Mischke RE, Numao T, Protopopescu D, Sher A, Sullivan T, Vavilov D, Yamada K. Improved Measurement of the π→eν Branching Ratio. PHYSICAL REVIEW LETTERS 2015; 115:071801. [PMID: 26317713 DOI: 10.1103/physrevlett.115.071801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Indexed: 06/04/2023]
Abstract
A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1%.
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Affiliation(s)
- A Aguilar-Arevalo
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Distrito Federal 04510 México
| | - M Aoki
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Blecher
- Physics Department, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - D I Britton
- Physics Department, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - D A Bryman
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - D Vom Bruch
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - S Chen
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
| | - J Comfort
- Physics Department, Arizona State University, Tempe, Arizona 85287, USA
| | - M Ding
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
| | - L Doria
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - S Cuen-Rochin
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - P Gumplinger
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Hussein
- University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
| | - Y Igarashi
- KEK, 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801, Japan
| | - S Ito
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S H Kettell
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - L Kurchaninov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - L S Littenberg
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - C Malbrunot
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - R E Mischke
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - T Numao
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Protopopescu
- Physics Department, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - A Sher
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - T Sullivan
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - D Vavilov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - K Yamada
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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