Observation of Zb(10610) and Zb(10650) Decaying to B Mesons
We report the analysis of the three-body e+e−→BB¯π±, BB¯∗π±, and B∗B¯∗π± processes, including the first observations of the Z±b(10610)→[BB¯∗+c.c.]± and Z±b(10650)→[B∗B¯∗]± transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of σ(e+e−→[BB¯∗+c.c.]±π∓)=[17.4±1.6(stat)±1.9(syst)] pb and σ(e+e−→[B∗B¯∗]±π∓)=[8.75±1.15(stat)±1.04(syst)] pb and set a 90% C.L. upper limit of σ(e+e−→[BB¯]±π∓)<2.9 pb. The results are based on a 121.4 fb−1 data sample collected with the Belle detector at a center-of-mass energy near the ϒ(10860) peak.
Physical Review Letters
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