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Inspired by the newly observed two charged bottomonium-like states, weconsider the possible contribution from the intermediate $Z_b(10610)$ and$Z_b(10650)$ states to the $\Upsilon(5S)\to \Upsilon(2S)\pi^+\pi^-$ decayprocess, which naturally explains Belle's previous observation of the anomalous$\Upsilon(2S)\pi^+\pi^-$ production near the peak of $\Upsilon(5S)$ at $\sqrts=10.87$ GeV [K.F. Chen {\it et al}. (Belle Collaboration), Phys. Rev. Lett.{\bf 100}, 112001 (2008)]. The resulting $d\Gamma(\Upsilon(5S)\to\Upsilon(2S)\pi^+\pi^-)/dm_{\pi^+\pi^-}$ and $d\Gamma(\Upsilon(5S)\to\Upsilon(2S)\pi^+\pi^-)/d\cos\theta$ distributions agree with Belle'smeasurement after inclusion of these $Z_b$ states. This formalism alsoreproduces the Belle observation of the double-peak structure and itsreflection in $\Upsilon(2S)\pi^+$ invariant mass spectrum of $\Upsilon(5S)\to\Upsilon(2S)\pi^+\pi^-$ decay.

Charged bottomonium-like states $Z_b(10610)$ and $Z_b(10650)$ and the $\Upsilon(5S)\to \Upsilon(2S)\pi^+\pi^-$ decay