$Z_b(10610)$ and $Z_b(10650)$ structures produced by the initial single pion emission in the $Υ(5S)$ decays

We propose an unique mechanism called {\it Initial Single Pion Emission} existing in the $Υ(5S)$ decays, and further study the line shapes of $dΓ(Υ(5S\to Υ(nS)π^+π^-))/dm_{Υ(nS)π^+}$ ($n=1,2,3$) and $dΓ(Υ(5S\to h_b(mP)π^+π^-))/dm_{h_b(mP)π^+}$ ($m=1,2$). We find sharp structures around 10610 MeV and 10650 MeV in the obtained theoretical line shapes of $dΓ(Υ(5S\to Υ(nS)π^+π^-))/dm_{Υ(nS)π^+}$ and $dΓ(Υ(5S\to h_b(mP)π^+π^-))/dm_{h_b(mP)π^+}$ distributions, which could naturally correspond to the $Z_b(10610)$ and $Z_b(10650)$ structures newly observed by Belle.

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