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Observation of the $W$-annihilation process $D_s^+ \to \omega\rho^+$ and measurement of $D_s^+ \to \phi\rho^+$ in $D^+_s\to \pi^+\pi^+\pi^-\pi^0\pi^0$ decays
We present the first amplitude analysis and branching fraction measurement of the decay $D^+_s\to \pi^+\pi^+\pi^-\pi^0\pi^0$, using $e^+e^-$ collision data collected with the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV corresponding to an integrated luminosity of 7.33 fb$^{-1}$, and report the first observation of the pure $W$-annihilation decay …