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arxiv 1810.06181 v1 pith:PRC7ZGU6 submitted 2018-10-15 hep-ex nucl-ex
Observation of Xi(1620)⁰ and evidence for Xi(1690)⁰ in Xi_c^+ rightarrow Xi^-π^+π^+ decays
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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 $S=-2$.
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Cited by 2 Pith papers
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Experimental Advances on Light Baryon Spectroscopy at BESIII Experiment
hep-ex 2026-03 unverdicted novelty 5.0
BESIII reports discoveries of multiple new excited light baryon states from high-statistics data, expanding the known spectrum and supporting non-perturbative QCD studies.
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Experimental Advances on Light Baryon Spectroscopy at BESIII Experiment
hep-ex 2026-03 unverdicted novelty 4.0
BESIII reports discoveries of new excited nucleon, Lambda, Sigma, Xi, and Omega hyperon states from high-statistics electron-positron collision data.
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