2012/12/16 by Gang Li, Feng Lan Shao, Cheng Wei Zhao +1 · 2 citations
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.87.034020
9 pages, 5 figures
arxiv created 2012/12/16 · arxiv updated 2013/03/13
With the recent measurement of Zb(10610) and Zb(10650)→ BB^*+c.c. and B^*B^*, we investigate the transitions from the Zb(10610) and Zb(10650) to bottomonium states with emission of a pion via intermediate B B^* meson loops. The experimental data can be reproduced in this approach with a commonly accepted range of values for the form factor cutoff parameter α. The Υ(3S)π decay channels appear to experience obvious threshold effects which can be understood by the property of the loop integrals. By investigating the α-dependence of partial decay widths and ratios between different decay channels, we show that the intermediate B B^* meson loops are crucial for driving the transitions of Zb/Zb'→ Υ(nS)π with n = 1, 2, 3, and hb(mP)π with m = 1 and 2.