Improved Measurement of theπ→eνBranching Ratio
| Autor: | D. Vavilov, T. Numao, M. Ding, Masaharu Aoki, Dave Britton, C. Malbrunot, Ahmed Hussein, Koji Yamada, L. S. Littenberg, T. Sullivan, S. Cuen-Rochin, S. Ito, Douglas Bryman, R. E. Mischke, Y. Igarashi, P. Gumplinger, A. Sher, D. Vom Bruch, Luca Doria, Leonid Kurchaninov, J. R. Comfort, Song Chen, S. H. Kettell, M. Blecher, D. Protopopescu, Alexis A. Aguilar-Arevalo |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 115 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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%. |
| Databáze: | OpenAIRE |
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