Exploring the ${\rm Y}(4S,5S,6S)\to h_b(1P)\eta$ hidden-bottom hadronic transitions

Yawei Zhang, Gang Li

Recently, Belle Collaboration has reported the measurement of the spin-flipping transition ${\rm Y}(4S)\to h_b(1P)\eta$ with an unexpectedly large branching ratio: $\mathcal{B}(Υ(4S) \to h…