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Amplitude analysis of $$e^+e^- to Upsilon(nS) pi^+pi^-$$ at $$sqrt{s}=10.866$$ GeV

$$sqrt{s}=10.866$$GeVでの$$e^+e^- to Upsilon(nS) pi^+pi^-$$反応の振幅解析

Garmash, A.*; 谷田 聖   ; Belle Collaboration*

Garmash, A.*; Tanida, Kiyoshi; Belle Collaboration*

We report results on studies of the $$e^+e^-$$ annihilation into three-body $$Upsilon(nS)pi^+pi^-$$ ($$n=1,2,3$$) final states including measurements of cross sections and the full amplitude analysis. The cross sections measured at $$sqrt{s} = 10.866$$ GeV and corrected for the initial state radiation are $$sigma(e^+e^- to Upsilon(1S)pi^+pi^-) = (2.27 pm 0.12 pm 0.14)$$ pb, $$sigma(e^+e^- to Upsilon(2S)pi^+pi^-) = (4.07 pm 0.16 pm 0.45)$$ pb, $$sigma(e^+e^- to Upsilon(3S)pi^+pi^-) = (1.46 pm 0.09 pm 0.16)$$ pb. Amplitude analysis of the three-body $$Upsilon(nS)pi^+pi^-$$ final states strongly favors $$I^G(J^P) = 1^+(1^+)$$ quantum-number assignments for the two bottomonium-like $$Z^{pm}_b$$ states, recently observed in the $$Upsilon(nS)pi^+pi^-$$ and $$h_b(mP)pi^{pm}$$ ($$m=1,2$$) decay channels. The results are obtained with a 121.4 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider.

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パーセンタイル:92.84

分野:Astronomy & Astrophysics

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