Measurement of the branching fractions of ${\chi }_{cJ}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$ via $\psi (3686)\to \gamma {\chi }_{cJ}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +762

Using $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector operating at BEPCII, the branching fractions of ${\chi }_{cJ}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$ ($J=0,1,2$) are mea…