Chromoelectric projections of light-front gluonic gravitational distributions in near-threshold quarkonium scattering
Abstract
We apply the established Drell-Yan-frame light-front EMT/GFF density framework to the gluonic response selected by compact-quarkonium chromoelectric scattering. The analysis separates the scalar trace form factor from the non-scalar gluon EMT combination governed by Ag(t), Dg(t), and Cg(t). The forward chromoelectric strength is fixed externally by the threshold ratio R LF int=N nt(0)/Nθ(0) 0.15, while the transverse profile is controlled by the normalized off-forward form-factor shape. We show that scalar and non-scalar responses can have different transverse localization and that near-threshold quarkonium production probes a chromoelectric EMT projection rather than an individual gravitational form-factor slope or a universal mass density.
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