Newly discovered ${\Xi }_c^0$ resonances and their parameters

Abstract

The aim of the present article is investigation of the newly observed resonances ${\Xi }_c(2923{)}^0$, ${\Xi }_c(2939{)}^0$, and ${\Xi }_c(2965{)}^0$ which are real candidates to charm-strange baryons. To this end, we calculate the mass and pole residue of the ground-state and excited $1P$ and $2S$ spin- flavor-sextet baryons ${\Xi }_c^{\prime 0}$, ${\Xi }_c^{\prime 0}(1/2^{-})$ and ${\Xi }_c^{\prime 0}(1/2^{+})$ with quark content $csd$, respectively. The masses and pole residues of the ground-state and excited spin-$3/2$ baryons ${\Xi }_c^{\star 0}$ are found as well. Spectroscopic parameters of these particles are computed in the context of the QCD two-point sum rule method. Widths of the excited baryons are evaluated through their decays to final states ${\Lambda }_c^{+}{K}^{-}$ and . These processes are explored by means of the full QCD light-cone sum rule method necessary to determine strong couplings at relevant vertices. Obtained predictions for the masses and widths of the four excited baryons, as well as previous results for $1P$ and $2S$ flavor-antitriplet spin-1/2 particles ${\Xi }_c^0$ are confronted with available experimental data on ${\Xi }_c^0$ resonances to fix their quantum numbers. Our comparison demonstrates that the resonances ${\Xi }_c(2923{)}^0$ and ${\Xi }_c(2939{)}^0$ can be considered as $1P$ excitations of the spin-$1/2$ flavor-sextet and spin-$3/2$ baryons, respectively. The resonance ${\Xi }_c(2965{)}^0$ may be interpreted as the excited $2S$ state of either spin- flavor-sextet or antitriplet baryon.

15 Pages, 4 Figures and 2 Tables

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Cited by in corpus (7)

• An updated review of the new hadron states
• Charmed Baryon Physics Circa 2021
• Identifying the ${\Xi }_b(6100)$ as the $P$-wave bottom baryon of $J^P=3/2^{-}$
• Toward establishing the low-lying $P$-wave excited ${\Sigma }_c$ baryon states
• Strong decays of the low-lying $1P$- and $1D$-wave ${\Sigma }_c$ baryons
• Properties of spin-1/2 heavy baryons at nonzero temperature
• Radiative ${\Xi }_b^{-}\to {\Xi }^{-}\gamma$ decay