Σ + and Σ ¯ − Polarization in the J / ψ and ψ ( 3686 ) Decays
Mikhail N. Achasov, P. Adlarson, S. Ahmed, M. Albrecht et autres
From $1310.6\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }J/\ensuremath{\psi}$ and $448.1\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }\ensuremath{\psi}(3686)$ events collected with the BESIII experiment, we report the first observation of ${\mathrm{\ensuremath{\Sigma}}}^{+}$ and ${\overline{\mathrm{\ensuremath{\Sigma}}}}^{\ensuremath{-}}$ spin polarization in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}[\ensuremath{\psi}(3686)]\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{\ensuremath{-}}$ decays. The relative phases of the form factors $\mathrm{\ensuremath{\Delta}}\mathrm{\ensuremath{\Phi}}$ have been measured to be $(\ensuremath{-}15.5\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode^\circ\else\textdegree\fi{}$ …
cn, ru, se, de, it, in, mn, us, tr, gb (code pays fourni par la source)