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Observation of the radiative decays of $$Upsilon(1S)$$ to $$chi_{c1}$$

$$Upsilon(1S)$$から$$chi_{c1}$$への放射崩壊の観測

Katrenko, P.*; 谷田 聖   ; Belle Collaboration*; 他168名*

Katrenko, P.*; Tanida, Kiyoshi; Belle Collaboration*; 168 of others*

We report the first observation of the radiative decay of the $$Upsilon(1S)$$ into a charmonium state. The statistical significance of the observed signal of $$Upsilon(1S) to gamma chi_{c1}$$ is 6.3 standard deviations including systematics. The branching fraction is calculated to be Br($$Upsilon(1S) to gamma chi_{c1}$$) = $$(4.7^{+2.4}_{-1.8} (stat) ^{+0.4}_{-0.5} (sys)) times 10^{-5}$$. We also searched for $$Upsilon(1S)$$ radiative decays into $$chi_{c0,2}$$ and $$eta_c(1S,2S)$$ and set upper limits on their branching fractions. These results are obtained from a 24.9 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider at a center-of-mass energy equal to the $$Upsilon(2S)$$ mass using $$Upsilon(1S)$$ tagging by the $$Upsilon(2S) to Upsilon(1S) pi^+pi^-$$ transitions.

使用言語

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English

掲載資料名

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Physical Review Letters

巻

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124

号

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12

ページ数

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p.122001_1 - 122001_7

発行年月

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2020/03

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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ハドロン分光

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevLett.124.122001

研究データの公開先DOI

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使用施設

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広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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高エネルギー加速器研究機構

Access

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- Accesses

InCites™

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パーセンタイル：22.16

分野：Physics, Multidisciplinary

Altmetrics

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