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Energy scan of the $$e^+e^- to h_b(nP) pi^+pi^-$$ $$(n=1,2)$$ cross sections and evidence for $$Upsilon(11020)$$ decays into charged bottomoniumlike states

$$e^+e^- to h_b(nP) pi^+pi^-$$ $$(n=1,2)$$反応断面積のエネルギー依存性と荷電ボトモニウム様状態に崩壊する$$Upsilon(11020)$$の証拠

Mizuk, R.*; 谷田 聖; Belle Collaboration*; 他166名*

Mizuk, R.*; Tanida, Kiyoshi; Belle Collaboration*; 166 of others*

Using data collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider, we measure the energy dependence of the $$e^+e^- to h_b(nP) pi^+pi^-$$ $$(n=1,2)$$ cross sections from thresholds up to 11.02 GeV. We find clear $$Upsilon(10860)$$ and $$Upsilon(11020)$$ peaks with little or no continuum contribution. We study the resonant substructure of the $$Upsilon(11020) to h_b(nP) pi^+pi^-$$ 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.

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パーセンタイル:46.77

分野:Physics, Multidisciplinary

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