Speaker
Summary
We report new measurements of the total cross sections for $e^+e^-\to\Upsilon(nS)\pi^+\pi^-$ (n = 1, 2, 3) and $e^+e^-\to b\bar{b} from a high-luminosity fine scan of the c.m.energy range 10.63-11.05 GeV and determine masses and widths of the Upsilon(10860) and Upsilon(11020) resonances as well as their relative phase. For the first time we observe the transition $\Upsilon(4S)\to\eta h_b(1P)$ and update the $h_b(1P)$ mass. Also revised are the branching fraction of $h_b(1P)\to\gamma\eta_b(1S)$ and the $eta_b(1S)$ mass and width. We measure energy dependence of the $h_b(nP)\pi^+\pi^-$ (n = 1, 2) cross sections, where we find clear $\Upsilon(10860)$ and $\Upsilon(11020)$ peaks. We find evidence that $\Upsilon(11020)\to h_b(nP)\pi^+\pi^-$ transitions proceed entirely via the $Z_b(10610)$ and $Z_b(10650)$ states. We report the analysis of the three-body $e^+e^-\to B^{()}\bar{B}^{()}\pi$ processes, including the Born cross sections measurements and the first observations of the $Z_b(10610)\to B\bar{B}^$ and $Z_b(10650)\to B^\bar{B}^* transitions.
