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arxiv: 1506.05845 · v2 · pith:SPSJRBXVnew · submitted 2015-06-18 · ✦ hep-ex

Improved measurement of the π rightarrow mbox{e} ν branching ratio

A.Aguilar-Arevalo , M. Aoki , M. Blecher , D.I. Britton , D.A. Bryman , D. vom Bruch , S. Chen , J. Comfort
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M. Ding L. Doria S. Cuen-Rochin P. Gumplinger A. Hussein Y. Igarashi S. Ito S.H. Kettell L. Kurchaninov L.S. Littenberg C. Malbrunot R.E. Mischke T. Numao D. Protopopescu A. Sher T. Sullivan D. Vavilov K. Yamada
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classification ✦ hep-ex
keywords rightarrowgammamboxbranchingmeasurementratioagreementelectron-muon
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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 %.

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