Gottfried-Jackson polarization filters for holographic dilaton and transverse-traceless gluon responses in near-threshold $J/ψ$ photoproduction
Year: 2026
Type: preprint
Abstract: Within the Hatta-Yang holographic graviton-dilaton amplitude for near-threshold $J/ψ$ photoproduction, we identify exact dilaton-null spin-projection channels in the Gottfried--Jackson basis. The $m=0$ and $m=-λ_γ$ amplitudes receive no dilaton contribution; for photon polarization normal to the reaction plane the $m=0$ channel further isolates $A_g(t)+B_g(t)$ and requires nucleon spin transfer. Standard beam-polarization spin-density-matrix elements then furnish a TT-sensitive combination and a second bilinear containing linear dilaton-TT interference. Comparison with modern GlueX and CLAS12 cross sections shows substantial sensitivity to the shape of the original holographic parameterization. The polarization observables therefore provide direct probes of the tensor structure of the production amplitude.
Source: arXiv (Cornell University)
Author: Syamtomov, Arkadiy I.
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214707403