Measurement of the τ Lepton Mass and an Upper Limit on the Mass Difference between τ+ and τ−

Le résumé fourni par la source

The mass of the $\ensuremath{\tau}$ lepton has been measured in the decay mode $\ensuremath{\tau}\ensuremath{\rightarrow}3\ensuremath{\pi}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ using a pseudomass technique. The result obtained from $414\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the Belle detector is ${M}_{\ensuremath{\tau}}=[1776.61\ifmmode\pm\else\textpm\fi{}0.13(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.35(\mathrm{sys})]\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. The upper limit on the relative mass difference between positive and negative $\ensuremath{\tau}$ leptons is $|{M}_{{\ensuremath{\tau}}^{+}}\ensuremath{-}{M}_{{\ensuremath{\tau}}^{\ensuremath{-}}}|/{M}_{\ensuremath{\tau}}<2.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at 90% confidence level.

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