Search for free decay of negative pions in water and light materials

Le résumé fourni par la source

We report on a search for the free-decay component of ${\ensuremath{\pi}}^{\ensuremath{-}}$ stopped in water and light materials. A nonzero value of this would be an indication of anomalous ${\overline{\ensuremath{\nu}}}_{e}$ contamination to the ${\ensuremath{\nu}}_{e}$ and ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ production at stopped-pion neutrino facilities. No free-decay component of ${\ensuremath{\pi}}^{\ensuremath{-}}$ was observed in water, Beryllium, and Aluminum, for which upper limits were established at $8.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $3.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and $7.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, respectively.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.