New Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi><mml:mo>→</mml:mo><mml:mi>e</mml:mi><mml:mi>ν</mml:mi></mml:math>Branching Ratio

TL;DRAbstract

A new measurement of the $\ensuremath{\pi}\ensuremath{\rightarrow}e\ensuremath{\nu}$ branching ratio yields $\frac{\ensuremath{\Gamma}(\ensuremath{\pi}\ensuremath{\rightarrow}e\ensuremath{\nu}+\ensuremath{\pi}\ensuremath{\rightarrow}e\ensuremath{\nu}\ensuremath{\gamma})}{\ensuremath{\Gamma}(\ensuremath{\pi}\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}+\ensuremath{\pi}\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\nu}\ensuremath{\gamma})}=(1.218\ifmmode\pm\else\textpm\fi{}0.014)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. The measured value is in good agreement with the standard-model prediction incorporating electron-muon universality.

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