${\Lambda }_b(6146{)}^0$ state newly observed by LHCb

Abstract

We study the bottom ${\Lambda }_b(6146{)}^0$ baryon, newly discovered by the LHCb Collaboration. By adopting an interpolating current of $(L_{\rho },L_{\lambda })=(0,2)$ type and $D$-wave nature with spin-parity quantum numbers $J^P={\frac{3}{2}}^{+}$ for this heavy bottom baryon, we calculate its mass and residue. Using these spectroscopic parameters, we also investigate its dominant decays ${\Lambda }_b(6146{)}^0\to {\Sigma }_b\pi$ and ${\Lambda }_b(6146{)}^0\to {\Sigma }_b^{\ast }\pi$ and estimate the width of ${\Lambda }_b(6146{)}^0$ obtained via these channels. The obtained mass, $m_{{\Lambda }_b}=(6144\pm 68)$~MeV is in accord nicely with the experimental data. The width obtained via the dominant channels is also consistent with the experimental data of LHCb collaboration. We calculate the spectroscopic parameters and the same decay channels for the $c$-partner of ${\Lambda }_b(6146{)}^0$ state, namely ${\Lambda }_c(2860{)}^{+}$, as well. We compare the obtained results with the existing theoretical predictions as well as experimental data. The results indicate that the state ${\Lambda }_b(6146{)}^0$ and its charmed-partner ${\Lambda }_c(2860{)}^{+}$ can be considered as $1D$-wave baryons with $J^P={\frac{3}{2}}^{+}$.

11 Pages and 5 Tables. The title has slightly been changed

References in corpus (28)

• 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
• Strong Decays of Charmed Baryons in Heavy Hadron Chiral Perturbation Theory
• Strong decays of charmed baryons
• 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
• Mass spectra and Regge trajectories of ${\Lambda }_c^{+}$, ${\Sigma }_c^0$, ${\Xi }_c^0$ and ${\Omega }_c^0$ Baryons
• Low-lying charmed and charmed-strange baryon states
• Radiative Decays of the Heavy Flavored Baryons in Light Cone QCD Sum Rules
• Analysis of the $1/2^{-}$ and $3/2^{-}$ heavy and doubly heavy baryon states with QCD sum rules
• Structure of charmed baryons studied by pionic decays
• D-wave charmed and bottomed baryons from QCD sum rules
• Study of excited ${\Lambda }_{\mathrm{b}}^0$ states decaying to ${\Lambda }_{\mathrm{b}}^0{\pi }^{+}{\pi }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• 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 $6_F$
• Strong coupling constants of light pseudoscalar mesons with heavy baryons in QCD
• Study of $P$-wave excitations of observed charmed strange baryons
• ${\Omega }_c\gamma \to {\Omega }_c^{\ast }$ transition in lattice QCD
• Strong decays of the higher excited ${\Lambda }_Q$ and ${\Sigma }_Q$ baryons
• Strong decays of heavy baryons in Bethe-Salpeter formalism
• Interpretation of the observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ states as 1$D$ bottom baryons
• Strong Decays of observed ${\Lambda }_c$ Baryons in the ${}^3{P}_0$ Model
• ${\Sigma }_Q{\Lambda }_Q\pi$ Coupling Constant in Light Cone QCD Sum Rules
• Study of $2S$- and $1D$- excitations of observed charmed strange baryons

Cited by in corpus (14)

• An updated review of the new hadron states
• Systematic analysis of strange single heavy baryons ${\Xi }_c$ and ${\Xi }_b$
• Spectra and decay properties of ${\Lambda }_b$ and ${\Sigma }_b$ baryons
• Identifying the ${\Xi }_b(6100)$ as the $P$-wave bottom baryon of $J^P=3/2^{-}$
• The newly observed ${\Lambda }_b(6072{)}^0$ structure and its $\rho -$mode nonstrange partners
• New ${\Lambda }_b(6072{)}^0$ state as a $2S$ bottom baryon
• 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
• Analysis of the electromagnetic form factors and the radiative decays of the vector heavy-light mesons
• Chiral effective theory of scalar and vector diquarks revisited
• Baryons and baryoniums in the perspective of QCD sum rules
• Strange pentaquark molecules in QCD sum rules