Measurement of via initial state radiation at Belle

Belleにおける始状態放射を利用した反応の測定

Wang, X. L.*; 谷田聖 ; Belle Collaboration*; 他144名*

Wang, X. L.*; Tanida, Kiyoshi; Belle Collaboration*; 144 of others*

We report measurement of the cross section of between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a 980 ${rm fb^{-1}}$ data sample recorded with the Belle detector. The properties of the and states are determined. Fitting the mass spectrum of with two coherent Breit-Wigner functions, we find two solutions with identical mass and width but different couplings to electron-positron pairs: $M_{Y(4360)}=(4347 pm 6 pm 3)$ ${rm MeV}/c^2$ , $Gamma_{Y(4360)} = (103 pm 9 pm 5)$ MeV, $M_{Y(4660)}=(4652 pm 10 pm 8)$ ${rm MeV}/c^2$ , $Gamma_{Y(4660)} = (68 pm 11 pm 1)$ MeV, and ${cal B}[Y(4360) to pi^+pi^- psi(2S)]cdot Gamma^{e^+e^-}_{Y(4360)} = (10.9 pm 0.6 pm 0.7)$ eV and ${cal B}[Y(4660)to pi^+pi^- psi(2S)]cdotGamma^{e^+e^-}_{Y(4660)}=(8.1 pm 1.1 pm 0.5)$ eV for one solution; or ${cal B}[Y(4360) to pi^+pi^- psi(2S)]cdot Gamma^{e^+e^-}_{Y(4360)} = (9.2 pm 0.6 pm 0.6)$ eV and ${cal B}[Y(4660)to pi^+pi^- psi(2S)]cdotGamma^{e^+e^-}_{Y(4660)}=(2.0 pm 0.3 pm 0.2)$ eV for the other. Here, the first errors are statistical and the second systematic. Evidence for a charged charmoniumlike structure at 4.05 ${rm MeV}/c^2$ is observed is observed in the $pi^{pm}psi(2S)$ intermediate state in the decays.

使用言語	:	English
掲載資料名	:	Physical Review D
巻	:	91
号	:	11
ページ数	:	p.112007_1 - 112007_15
発行年月	:	2015/06
発表会議名	:
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キーワード	:	ハドロン分光

特許データ	:
PDF	:	AA2015-0519.pdf:0.8MB

論文URL	:	https://doi.org/10.1103/PhysRevD.91.112007
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受委託・共同研究相手機関	:	高エネルギー加速器研究機構

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InCites™	:	パーセンタイル：97.71 分野：Astronomy & Astrophysics
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登録番号 : AA20150519
抄録集掲載番号 : 44000069
論文投稿番号 : 16767

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