Charged bottomonium-like structures in the hidden-bottom dipion decays of ${\rm Y}(11020)$

Abstract

Under the Initial Single Pion Emission mechanism, we study the hidden-bottom dipion decays of ${\rm Y}(11020)$, i.e., ${\rm Y}(11020)\to {\rm Y}(nS){\pi }^{+}{\pi }^{-}$ $(n=1,2,3)$ and ${\rm Y}(11020)\to h_b(mP){\pi }^{+}{\pi }^{-}$ $(m=1,2)$. We predict explicit sharp peak structures close to the $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ thresholds and their reflections in the ${\rm Y}(1S){\pi }^{+}$, ${\rm Y}(2S){\pi }^{+}$ and $h_b(1P){\pi }^{+}$ invariant mass spectrum distributions. We suggest future experiment, i.e., Belle, BaBar, and forthcoming BelleII or Super-B, carry out the search for these novel phenomena, which can provide important test to the Initial Single Emission mechanism existing in higher bottomonia.

Comments: 5 pages, 4 figures, 1 table, More discussions added. Accepted by Phys. Rev. D