Understanding the nature of the heavy pentaquarks and searching for them in pion-induced reactions

Abstract

We investigate the reaction ${\pi }^{-}p\to {\pi }^{-}J/\psi p$ via the open-charm hadron rescattering diagrams. Due to the presence of the triangle singularity (TS) in the rescattering amplitudes, the TS peaks can simulate the pentaquark-like resonances arising in the $J/\psi p$ invariant mass distributions, which may bring ambiguities on our understanding of the nature of the exotic states. Searching for the heavy pentaquark in different processes may help us to clarify the ambiguities, because of the highly process-dependent characteristic of the TS mechanism.

15 pages, 3 figures, 4 tables

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• Big-Bang Nucleosynthesis
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• Strong Decays of Charmed Baryons in Heavy Hadron Chiral Perturbation Theory
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Cited by in corpus (23)

• Hadronic molecules
• Pentaquark and Tetraquark states
• Threshold cusps and triangle singularities in hadronic reactions
• Tetra- and penta-quark structures in the constituent quark model
• Remarks on the $P_c$ structures and triangle singularities
• $P_c$ pentaquarks with chiral tensor and quark dynamics
• Hidden-charm and bottom meson-baryon molecules coupled with five-quark states
• Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for ${\bar{D}}^{(\ast )}{\Lambda }_{\mathrm{c}}$ and ${\bar{D}}^{(\ast )}{\Sigma }_{\mathrm{c}}^{(\ast )}$
• Confronting pentaquark photoproduction with new LHCb observations
• Hidden-Bottom Pentaquarks
• Hidden Charm Pentaquark $P_c(4380)$ and Doubly Charmed Baryon ${\Xi }_{cc}^{\ast }(4380)$ as Hadronic Molecule States
• How to understand the underlying structures of $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$
• Visible narrow cusp structure in ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ enhanced by triangle singularity
• Photoproduction of strange hidden-charm and hidden-bottom states
• On the hidden charm pentaquark-s in ${\Lambda }_b\to J/\psi K^{-}p$ decay
• Generating a resonance-like structure in the reaction $B_c\to B_s\pi \pi$
• Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^{+}\to J/\psi \varphi K^{+}$
• Flavor-singlet charm pentaquark
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Identify the hidden charm pentaquark signal from non-resonant background in electron-proton scattering
• Production of hidden-charm and hidden-bottom pentaquark states in electron-proton collisions
• Hidden charm pentaquark and $\Lambda (1405)$ in the ${\Lambda }_b^0\to {\eta }_c{K}^{-}p(\pi \Sigma )$ reaction
• Hunting for the heavy quark spin symmetry partner of $Z_{cs}$