Published in

American Physical Society, Physical Review Letters, 14(117), 2016

DOI: 10.1103/physrevlett.117.142001

Links

Tools

Export citation

Search in Google Scholar

Energy scan of the $e^+e^- \to h_b(nP)π^+π^-$ $(n=1,2)$ cross sections and evidence for $ϒ(11020)$ decays into charged bottomonium-like states

Journal article published in 2016 by A. Abdesselam, 李海波, I. Adachi, Aulchenko, T. Aushev, R. Ayad, T. Aziz, K. Adamczyk, Babu, I. Badhrees, S. Bahinipati, A. M. Bakich, A. Bala, Y. Ban, Vikas Bansal and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Green circle
Postprint: archiving allowed
Upload
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

Using data collected with the Belle detector at the KEKB asymmetric-energy$e^{+}e^{-}$ collider, we measure the energy dependence of the $e^{+}e^{-}\to h_{b}(nP)π^{+}π^{-}$ (n=1, 2) cross sections from thresholds up to 11.02 GeV. We find clear ϒ(10860) and ϒ(11020) peaks with little or no continuum contribution. We study the resonant substructure of the ϒ(11020)$\to h_{b}(nP)π^{+}π^{-}$ transitions and find evidence that they proceed entirely via the intermediate isovector states Z$_b$(10610) and Z$_b$(10650). The relative fraction of these states is loosely constrained by the current data: The hypothesis that only Z$_b$(10610) is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only Z$_b$(10650) is produced is not excluded at a significant level.