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We revisit some aspects of the stringy approach to dipole-dipoleinteractions, scattering and entanglement in QCD, using the Nambu-Goto (NG)string, without recourse to holography. We first show that the potentialbetween two static dipoles exchanging closed NG strings is attractive at allseparations. Underlining the exchange there is an emergent entropy, that isdominated by the tachyon at large separation, and vanishes at short separation,a measure of the confinement-deconfinement transition. The same tachyon isdominant in the scattering amplitude, as a correlator of two Wilson loops fortwo fixed dipole-like hadrons separated at large rapidity gap, where thecontribution of the worldsheet fermions is included. While the tachyon causesthe mean string bit density to grow exponentially with the rapidity, the totalscattering cross section still satisfies the Froissart bound by quantumshadowing. The stringy scattering exchange also carries an entanglemententropy, that saturates when the bound is reached. For hadrons with varyingdipole sizes, the tachyon exchange takes place in hyperbolic space in theconformal limit. The result for the full S-matrix is reminiscent of the onefrom Mueller$^\prime$s evolved dipole wavefunction, for the total dipole-dipolecross section in perturbative QCD.

The Nambu-Goto string in QCD: Dipole interactions, scattering and entanglement