Zb/Zb′ → Υπ and hbπ decays in intermediate meson loops model

With the recent measurement of Z(b)(10610) and Z(b)(10650) -> B (B) over bar* + c.c. and B*(B) over bar*, we investigate the transitions from the Z(b)(10610) and Z(b)(10650) to bottomonium states with emission of a pion via intermediate BB* meson loops. The experimental data can be reproduced in this approach with a commonly accepted range of values for the form factor cutoff parameter alpha. The Upsilon(3S)pi decay channels appear to experience obvious threshold effects which can be understood by the property of the loop integrals. By investigating the alpha-dependence of partial decay widths and ratios between different decay channels, we show that the intermediate BB* meson loops are crucial for driving the transitions of Z(b)/Z(b)' -> Upsilon(nS)pi with n = 1, 2, 3, and h(b)(mP)pi with m = 1 and 2. DOI: 10.1103/PhysRevD.87.034020