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Observation of $$Xi(1620)^0$$ and evidence for $$Xi(1690)^0$$ in $$Xi_c^+ rightarrow Xi^-pi^+pi^+$$ decays

Sumihama, Mizuki*; Tanida, Kiyoshi   ; Belle Collaboration*; 184 of others*

We report the first observation of the doubly-strange baryon $$Xi(1620)^0$$ in its decay to $$Xi^-pi^+$$ via $$Xi_c^+ rightarrow Xi^- pi^+ pi^+$$ decays based on a $$980,{rm fb}^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. The mass and width are measured to be 1610.4 $$pm$$ 6.0 (stat) $$^{+5.9}_{-3.5}$$ (syst) MeV$$/c^2$$ and 59.9 $$pm$$ 4.8 (stat) $$^{+2.8}_{-3.0}$$ (syst) MeV, respectively. We obtain 4.0$$sigma$$ evidence of the $$Xi(1690)^0$$ with the same data sample. These results shed light on the structure of hyperon resonances with strangeness $$S=-2$$.

Language

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English

Journal

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Physical Review Letters

Volume

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122

Number

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7

Pages

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p.072501_1 - 072501_7

Publication Year/Month

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2019/02

Meeting title

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Held date

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Location (city)

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Location (country)

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Patent information

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PDF

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AA2019-0535.pdf:0.37MB

Paper URL

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https://doi.org/10.1103/PhysRevLett.122.072501

DOI for research data

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Keywords

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エキゾチックハドロン

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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高エネルギー加速器研究機構

Accesses

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- Accesses

InCites™

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Percentile:79.47

Category:Physics, Multidisciplinary

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