Status of Pion Decay Experiments

7th International Conference on Beauty, Charm, and Hyperons in Hadronic Interactions

Numao, T.^1

TRIUMF, 4004 Wesbrook Mall, Vancouver

BC

V6T 2A3, Canada^1

关键词: Branching ratio;    Experimental uncertainty;    The standard model;    Weak interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/770/1/012011/pdf
DOI  :  10.1088/1742-6596/770/1/012011

来源: IOP

【 摘 要 】

The branching ratio of pion decays, , has provided a sensitive test of electron-muon universality in weak interactions. The uncertainty of the Standard Model prediction is at a 0.01% level. Although a recent measurement, Re/μ= (1.2344 0.0023(stat) 0.0019(syst)) 10-4, reduced the experimental uncertainty by a factor of two, there is room for improvement by more than an order of magnitude. The status of two experiments at TRIUMF and PSI as well as related pion decay experiments is presented.