Observation of $\Xi (1620{)}^0$ and evidence for $\Xi (1690{)}^0$ in ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ decays

Abstract

We report the first observation of the doubly-strange baryon $\Xi (1620{)}^0$ in its decay to ${\Xi }^{-}{\pi }^{+}$ via ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ decays based on a $980{\mathrm{fb}}^{-1}$ 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) ${}_{-3.5}^{+5.9}$ (syst)~MeV$/c^2$ and 59.9 $\pm$ 4.8 (stat) ${}_{-3.0}^{+2.8}$ (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 $S=-2$.

arXiv comment6 pages, 3 figures, To be submitted to Phys. Rev. Lett

References in corpus (10)

• The nature of the Lambda(1405) resonance in chiral dynamics
• Quark mass dependence of s-wave baryon resonances
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces II. The strange baryon spectrum
• On the spin, parity and nature of the $\Xi (1620)$ resonance
• Xi and Omega baryons in the Skyrme model
• Strange baryon spectroscopy in the relativistic quark model
• Strangeness -2 and -3 Baryons in a Constituent Quark Model
• Theoretical study of the Xi(1620) and Xi(1690) resonances in Xi_c -> pi^+ MB decays
• $\Xi$ baryon strong decays in a chiral quark model
• First observation of the Xi- pi+ decay mode of the Xi0(1690) hyperon

Cited by in corpus (21)

• Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• QCD and the Strange Baryon Spectrum
• Measurement of the cross section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ and observation of an excited $\Xi$ baryon
• Accessing the strong interaction between $\Lambda$ baryons and charged kaons with the femtoscopy technique at the LHC
• Theoretical study of the $\Omega (2012)$ state in the ${\Omega }_c^0\to {\pi }^{+}\Omega (2012{)}^{-}\to {\pi }^{+}(\bar{K}\Xi {)}^{-}$ and ${\pi }^{+}(\bar{K}\Xi \pi {)}^{-}$ decays
• $\bar{K}\Lambda$ molecular explanation to the newly observed $\Xi (1620{)}^0$
• The $\Xi (1620)$ and $\Xi (1690)$ molecular states from $S=-2$ meson-baryon interaction up to next-to-leading order
• Understanding the nature of $\Omega (2012)$ in a coupled-channel approach
• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
• Analyzing $\Xi (1620)$ in the molecule picture in the Bethe-Salpeter equation approach
• Study ${\Xi }_c^{+}\to \Lambda {\bar{K}}^0{\pi }^{+}$ and search for the low-lying baryons $\Xi (1/2^{-})$ and $\Sigma (1/2^{-})$
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Strange pentaquarks and excited $\Xi$ hyperons in ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ final states
• Nonleptonic decays of ${\Xi }_{cc}\to {\Xi }_c\pi$ with ${\Xi }_c-{\Xi }_c^{\prime }$ mixing
• Analytic Map of Three-Channel S Matrix -Generalized Uniformization and Mittag-Leffler Expansion-
• Nature of excited $\Xi$ baryons with threshold effects
• Study of the resonance contributions in the ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decay
• Double strangeness pentaquarks and other exotic hadrons in the ${\Xi }_b\to \Xi J/\Psi \varphi$ decay
• The odd-parity strange baryons $\Sigma ({\frac{1}{2}}^{-})$ below 1.8 GeV with Hamiltonian effective field theory
• The pseudoscalar meson and baryon octet interaction with strangeness $S=-2$ in the unitary coupled-channel approximation
• Monte Carlo Simulation-Based Partial Wave Analysis of ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ Decay