On the nature of the lowest-lying odd parity charmed baryon ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$ resonances

Abstract

We study the structure of the ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$ resonances in the framework of an effective field theory consistent with heavy quark spin and chiral symmetries, that incorporates the interplay between ${\Sigma }_c^{(\ast )}\pi -N{D}^{(\ast )}$ baryon-meson degrees of freedom and bare P-wave $c\bar{u}d$ quark-model states. We show that these two resonances are not HQSS partners. The $J^P=3/2^{-}$ ${\Lambda }_c(2625)$ should be viewed mostly as a dressed three quark state, whose origin is determined by a bare state, predicted to lie very close to the mass of the resonance. The $J^P=1/2^{-}$ ${\Lambda }_c(2595)$ seems to have, however, a predominant molecular structure. This is because, it is either the result of the chiral ${\Sigma }_c\pi$ interaction, which threshold is located much more closer than the mass of the bare three-quark state, or because the light degrees of freedom in its inner structure are coupled to the unnatural $0^{-}$ quantum-numbers. We show that both situations can occur depending on the renormalization procedure used. We find some additional states, but the classification of the spectrum in terms of HQSS is difficult, despite having used interactions that respect this symmetry. This is because the bare quark-model state and the ${\Sigma }_c\pi$ threshold are located extraordinarily close to the ${\Lambda }_c(2625)$ and ${\Lambda }_c(2595)$, respectively, and hence they play totally different roles in each sector.

arXiv comment16 pages, 7 figures

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• ${\Lambda }_c\to {\Lambda }^{\ast }(1520)$ form factors from lattice QCD and improved analysis of the ${\Lambda }_b\to {\Lambda }^{\ast }(1520)$ and ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595,2625)$ form factors
• ${\Lambda }_b\to {\Lambda }_c^{\ast }(2595,2625){\ell }^{-}\bar{\nu }$ form factors from lattice QCD
• Investigating the spectroscopy behavior of undetected $1F$-wave charmed baryons
• Interpreting LHCb's ${\Lambda }_b\to {\Lambda }_c\tau \bar{\nu }$ measurement and puzzles in semileptonic ${\Lambda }_b$ decays
• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
• Measurement of the Masses and Widths of the ${\Sigma }_c(2455{)}^{+}$ and ${\Sigma }_c(2520{)}^{+}$ Baryons
• Strong decays of singly heavy baryons from a chiral effective theory of diquarks
• New physics effects on ${\Lambda }_b\to {\Lambda }_c^{\ast }\tau {\bar{\nu }}_{\tau }$ decays
• Study of $qqq\bar{q}Q$ pentaquark system in the Chiral Quark Model
• Is the ${\Lambda }_c(2625{)}^{+}$ the heavy quark spin symmetry partner of the ${\Lambda }_c(2595{)}^{+}$?
• Measurements of Born Cross Sections for $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2595{)}^{-}+c.c.$ and $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2625{)}^{-}+c.c.$ at $\sqrt{s}=$4918.0 and 4950.9 MeV
• Chiral effective theory of scalar and vector diquarks revisited
• $N^{\ast }$ states with hidden charm and a three-body nature