Roper-like resonances with various flavor contents and their two-pion emission decays

Abstract

We study the three-body decay of the newly observed bottom baryon ${\Lambda }_b^{\ast }(6072)$ by LHCb; ${\Lambda }_b^{\ast }(6072)\to {\Lambda }_b\pi \pi$. Its mass about 500 MeV above the ground state ${\Lambda }_b$ and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon $N(1440)$. In terms of sequential processes going through ${\Sigma }_b$ and ${\Sigma }_b^{\ast }$, we find that the observed invariant mass distribution is reproduced assuming its spin and parity $J^P=1/2^{+}$. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.

arXiv comment4 pages, 5 figures

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Cited by in corpus (12)

• An updated review of the new hadron states
• Relativistic corrections to decays of heavy baryons in the quark model
• Mixing effects on 1S and 2S state heavy mesons in the light-front quark model
• Universal behavior of mass gaps existing in the single heavy baryon family
• Strong decays of the low-lying bottom strange baryons
• Analysis of the 1S and 2S states of the ${\Lambda }_Q$ and ${\Xi }_Q$ with the QCD sum rules
• Novel pentaquark picture for singly heavy baryons from chiral symmetry
• Newly discovered ${\Xi }_c^0$ resonances and their parameters
• The newly observed ${\Lambda }_b(6072{)}^0$ structure and its $\rho -$mode nonstrange partners
• Electromagnetic transition amplitude for Roper resonance from holographic QCD
• Systematic study of hadronic excitation energy using Schottky anomaly
• Axial anomaly effect on three-quark and five-quark singly heavy baryons