Interpretation of the newly observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ states in a chiral quark model

Abstract

The strong decays of the low-lying $\lambda$-mode ${\Lambda }_b(1D,2S)$ and ${\Sigma }_b(2S)$ states are studied in a chiral quark model. We find that: (i) the newly observed ${\Lambda }_b(6146/6152)$ resonances in the ${\Lambda }_b{\pi }^{+}{\pi }^{-}$ spectrum by the LHCb Collaboration might be explained with the $\lambda$-mode ${\Lambda }_b(1D)$ states in the quark model. It should be emphasized that whether the structure in the ${\Lambda }_b{\pi }^{+}{\pi }^{-}$ spectrum correspond to two states or one state should be further clarified with more observations in future experiments. (ii) The ${\Lambda }_b(2S)$ $|J^P={\frac{1}{2}}^{+},0⟩$ state mainly decays into ${\Sigma }_b^{\ast }\pi$ channel, which may be an ideal channel for searching for this ${\Lambda }_b(2S)$ state in future experiments. (iii) The ${\Sigma }_b(2S)$ $|J^P={\frac{1}{2}}^{+},1⟩$ and $|J^P={\frac{3}{2}}^{+},1⟩$ dominantly decay into ${\Lambda }_b\pi$ with $\Gamma \simeq 3.82$ MeV and $\Gamma \simeq 4.72$ MeV, respectively.

6 pages. arXiv admin note: text overlap with arXiv:1810.02205

References in corpus (23)

• Heavy Baryons in a Quark Model
• Spectroscopy and Regge trajectories of heavy baryons in the relativistic quark-diquark picture
• Masses of excited heavy baryons in the relativistic quark-diquark picture
• Towards an understanding of heavy baryon spectroscopy
• Faddeev study of heavy baryon spectroscopy
• Assignments of ${\Lambda }_Q$ and ${\Xi }_Q$ baryons in the heavy quark-light diquark picture
• Strong and radiative decays of the low-lying $S$- and $P$-wave singly heavy baryons
• Charmed baryon strong decays in a chiral quark model
• Strong decays of heavy-light mesons in a chiral quark model
• Low-lying charmed and charmed-strange baryon states
• Strong and radiative decays of the doubly charmed baryons
• Structure of charmed baryons studied by pionic decays
• D-wave charmed and bottomed baryons from QCD sum rules
• Interpretation of the new ${\Omega }_c^0$ states via their mass and width
• Strong decays of the newly observed $D(2550)$, $D(2600)$, $D(2750)$, and $D(2760)$
• Strong decays of higher excited heavy-light mesons in a chiral quark model
• Identifying the ${\Xi }_b(6227)$ and ${\Sigma }_b(6097)$ as $P$-wave bottom baryons of $J^P=3/2^{-}$
• $D$-wave heavy baryons of the $SU(3)$ flavor $6_F$
• Excitations of single-beauty hadrons
• Strong decays of heavy baryons in Bethe-Salpeter formalism
• Canonical interpretation of the newly observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ via strong decay behaviors
• Combined Chiral Dynamics and MIT Bag Model Study of Strong Σ^{(*)}_Q \to Λ_QπDecays
• Dipion decays of heavy baryons

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• An updated review of the new hadron states
• Observation of a new baryon state in the ${\Lambda }_b^0{\pi }^{+}{\pi }^{-}$ mass spectrum
• Mass spectra and strong decays of charmed and charmed-strange mesons
• Strong decays of the higher excited ${\Lambda }_Q$ and ${\Sigma }_Q$ baryons
• $QQ\bar{s}\bar{s}$ tetraquarks in the chiral quark model
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Identification of newly observed singly charmed baryons using relativistic flux tube model
• Possible interpretation of the newly observed ${\Omega }_b$ states
• Strong decays of the low-lying bottom strange baryons
• Toward establishing the low-lying $P$-wave ${\Sigma }_b$ states
• Identifying the ${\Xi }_b(6100)$ as the $P$-wave bottom baryon of $J^P=3/2^{-}$
• Analysis of the 1S and 2S states of the ${\Lambda }_Q$ and ${\Xi }_Q$ with the QCD sum rules
• ${\Lambda }_b(6146{)}^0$ state newly observed by LHCb
• Strong decay properties of single heavy baryons ${\Lambda }_Q$, ${\Sigma }_Q$ and ${\Omega }_Q$
• New ${\Lambda }_b(6072{)}^0$ state as a $2S$ bottom baryon
• The newly observed ${\Lambda }_b(6072{)}^0$ structure and its $\rho -$mode nonstrange partners
• Determination of the possible quantum numbers for the newly observed ${\Xi }_b(6227{)}^0$ state
• The $1D$, $2D$ ${\Xi }_b$ and ${\Lambda }_b$ baryons
• Strong decays of singly heavy baryons from a chiral effective theory of diquarks
• Identifying the ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ as $D$-wave bottom baryons
• The $\Lambda$-type P-wave bottom baryon states via the QCD sum rules
• Toward establishing the low-lying $P$-wave excited ${\Sigma }_c$ baryon states
• Spectroscopic properties of $1F$-wave singly bottom baryons
• Chiral effective theory of scalar and vector diquarks revisited