High Energy Physics - Experiment
[Submitted on 18 Jun 2015 (v1), last revised 12 Aug 2015 (this version, v2)]
Title:Improved measurement of the $π\rightarrow \mbox{e} ν$ branching ratio
View PDFAbstract:A new measurement of the branching ratio, $R_{e/\mu} =\Gamma (\pi^+ \rightarrow \mbox{e}^+ \nu + \pi^+ \rightarrow \mbox{e}^+ \nu \gamma)/ \Gamma (\pi^+ \rightarrow \mu^+ \nu + \pi^+ \rightarrow \mu^+ \nu \gamma)$, resulted in $R_{e/\mu}^{exp} = (1.2344 \pm 0.0023 (stat) \pm 0.0019 (syst)) \times 10^{-4}$. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1 %.
Submission history
From: Toshio Numao [view email][v1] Thu, 18 Jun 2015 22:48:18 UTC (31 KB)
[v2] Wed, 12 Aug 2015 21:27:07 UTC (31 KB)
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