Double Polarization Observables in Pentaquark Photoproduction

Abstract

We investigate the properties of the hidden charm pentaquark-like resonances first observed by LHCb in 2015, by measuring the polarization transfer KLL between the incident photon and the outgoing proton in the exclusive photoproduction of J/psi near threshold. We present a first estimate of the sensitivity of this observable to the pentaquark photocouplings and hadronic branching ratios, and extend our predictions to the case of initial state helicity correlation ALL, using a polarized target. These results serve as a benchmark for the SBS experiment at Jefferson Lab, which proposes to measure for the first time the helicity correlations ALL and KLL in J/psi exclusive photoproduction, in order to determine the pentaquark photocouplings and branching ratios.

9 pages, 7 figures, 2 tables, Version published in PRD

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• Novel approaches in Hadron Spectroscopy
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• Identify the hidden charm pentaquark signal from non-resonant background in electron-proton scattering
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• Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules
• On the possibility of testing the two-peak structure of the LHCb hidden-charm strange pentaquark $P_{cs}(4459{)}^0$ in near-threshold antikaon-induced charmonium production on protons and nuclei
• Analysis of the contribution of the quantum anomaly energy to the proton mass
• Regarding the possibility to observe the LHCb hidden-charm strange pentaquark $P_{cs}(4459{)}^0$ in antikaon-induced $J/\psi$ meson production on protons and nuclei near the $J/\psi$$\Lambda$ production threshold
• Probing the hidden-bottom pentaquark resonances in photonuclear bottomonium production near threshold: differential observables
• Production of vector mesons in pentaquark states resonance channel in $p$-$A$ ultraperipheral collisions
• The possibility to study in-medium modification of $J/\psi$ mesons from their photoproduction on nuclei near threshold in the case of presence of the LHCb pentaquark states $P_c^{+}$ in this photoproduction
• Towards modeling the short-range interactions of hidden/open charm pentaquark molecular states
• Search for the $N$(1685) in $\eta \pi$-Photoproduction
• Quantum Numbers of the Pentaquark States $P_c^{+}$ via Symmetry Analysis
• Analysis of $J/\psi$ and $\psi (2S)$ Charmonium Production in Ultraperipheral Lead-Lead and Proton-Lead Collisions at LHC Energies