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Observation of $$Xi_{c}(2930)^0$$ and updated measurement of $$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ at Belle

Belle実験における$$Xi_{c}(2930)^0$$の観測と、$$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$崩壊測定のアップデート

Li, Y. B.*; 谷田 聖   ; Belle Collaboration*; 他178名*

Li, Y. B.*; Tanida, Kiyoshi; Belle Collaboration*; 178 of others*

We report the first observation of the $$Xi_{c}(2930)^0$$ charmed-strange baryon with a significance greater than 5$$sigma$$. The $$Xi_{c}(2930)^0$$ is found in its decay to $$K^- Lambda_{c}^+$$ in $$B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}$$ decays. The measured mass and width are $$[2928.9 pm 3.0(rm stat.)^{+0.9}_{-12.0}(rm syst.)]$$ MeV/$$c^{2}$$ and $$[19.5 pm 8.4(rm stat.) ^{+5.9}_{-7.9}(rm syst.)]$$ MeV, respectively, and the product branching fraction is $${cal B}(B^{-} to Xi_{c}(2930)^0 bar{Lambda}_{c}^{-})$$$$ {cal B}(Xi_{c}(2930)^0 to K^- Lambda_{c}^{+})$$=$$[1.73 pm 0.45(rm stat.) pm 0.21(rm syst.)] times 10^{-4}$$. We also measure $${cal B}(B^{-} to K^{-} Lambda_{c}^{+} bar{Lambda}_{c}^{-}) = [4.80 pm 0.43(rm stat.) pm 0.60(rm syst.)] times 10^{-4}$$ with improved precision, and search for the charmonium-like state $$Y(4660)$$ and its spin partner, $$Y_{eta}$$, in the $$Lambda_{c}^{+}bar{Lambda}_{c}^{-}$$ invariant mass spectrum. No clear signals of the $$Y(4660)$$ nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $$(772pm11)times 10^{6} Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

使用言語

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English

掲載資料名

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European Physical Journal C

巻

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78

号

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3

ページ数

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p.252_1 - 252_8

発行年月

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2018/03

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/10.1140/epjc/s10052-018-5720-5

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：83.35

分野：Physics, Particles & Fields

Altmetrics

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