Measurement of the branching fraction of J / ψ → ω η ′ π + π − and search for J / ψ → ω X ( 1835 ) , X ( 1835 ) → η ′ π + π − decay
М. Н. Ачасов, P. Adlarson, S. Ahmed, M. Albrecht et autres
Using a sample of $1.31\ifmmode\times\else\texttimes\fi{}{10}^{9}\text{ }\text{ }J/\ensuremath{\psi}$ events collected by the BESIII detector at BEPCII during 2009 and 2012, we study the $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ hadronic process. For the first time, we measure the branching ratio $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(1.12\ifmmode\pm\else\textpm\fi{}0.02\ifmmode\pm\else\textpm\fi{}0.13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. We search for the $X(1835)$ state in …
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