Status of the PIENU experiment at TRIUMF

[摘要] The PIENU experiment at TRIUMF aims to measure the branching ratio of pion decays R = Γ(π+→ e+νe+ π+→ e+νeγ)/Γ(π+→μ+νμ+ π+→ μ+νμγ) with precision

[发布机构] Osaka University, Toyonaka, Osaka; 560-0043, Japan^1;Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Mexico^2;Virginia Tech., Blacksburg; VA; 24061, United States^3;University of Glasgow, Glasgow, United Kingdom^4;University of British Columbia, Vancouver; BC; V6T 1Z1, Canada^5;Tsinghua University, Beijing; 100084, China^6;Arizona State University, Tempe; AZ; 85287, United States^7;TRIUMF, 4004 Wesbrook Mall, Vancouver; BC; V6T 2A3, Canada^8;University of Northern British Columbia, Prince George; BC; V2N 4Z9, Canada; (10) KEK, 1-1 Oho, Tsukuba-shi, Ibaraki; 305-0801, Japan; (11) Brookhaven National Laboratory, Upton; NY; 11973-5000, United States; (12) Present Address: CERN, Genéve 23; CH-1211, Switzerland^9

[关键词] Branching ratio;New physics;Stringent test;The standard model