First extraction of complete NΔ vector and tensor couplings to ρ, b1, a2 from polarized πΔ photoproduction using a Regge model on GlueX data.
Features of $\pi \Delta$ Photoproduction at High Energies
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abstract
Hybrid/exotic meson spectroscopy searches at Jefferson Lab require the accurate theoretical description of the production mechanism in peripheral photoproduction. We develop a model for $\pi\Delta$ photoproduction at high energies ($5 \leq E_{\text{lab}} \leq 16~\text{GeV}$) that incorporates both the absorbed pion and natural-parity cut contributions. We fit the available observables, providing a good description of the energy and angular dependencies of the experimental data. We also provide predictions for the photon beam asymmetry of charged pions at $E_{\text{lab}} = 9~\text{GeV}$ which is expected to be measured by GlueX and CLAS12 experiments in the near future.
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Regge amplitude fit to high-energy polarized pi- Delta++ photoproduction confirms pion dominance at small t and extracts pi N Delta coupling consistent with Delta decay plus first values for rho, b1, and a2 N Delta couplings.
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First determination of vector and tensor couplings from polarized $\pi\Delta$ photoproduction
First extraction of complete NΔ vector and tensor couplings to ρ, b1, a2 from polarized πΔ photoproduction using a Regge model on GlueX data.
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Mechanisms of high energy polarized photoproduction of $\pi^{-}\Delta^{++}$
Regge amplitude fit to high-energy polarized pi- Delta++ photoproduction confirms pion dominance at small t and extracts pi N Delta coupling consistent with Delta decay plus first values for rho, b1, and a2 N Delta couplings.