Holographic Pomeron and the Schwinger Mechanism

Abstract

We revisit the problem of dipole-dipole scattering via exchanges of soft Pomerons in the context of holographic QCD. We show that a single closed string exchange contribution to the eikonalized dipole-dipole scattering amplitude yields a Regge behavior of the elastic amplitude; the corresponding slope and intercept are different from previous results obtained by a variational analysis of semi-classical surfaces. We provide a physical interpretation of the semi-classical worldsheets driving the Regge behavior for (-t)>0 in terms of worldsheet instantons. The latter describe the Schwinger mechanism for string pair creation by an electric field, where the longitudinal electric field E_L=σ_T tanh(χ/2) at the origin of this non-perturbative mechanism is induced by the relative rapidity χ of the scattering dipoles. Our analysis naturally explains the diffusion in the impact parameter space encoded in the Pomeron exchange; in our picture, it is due to the Unruh temperature of accelerated strings under the electric field. We also argue for the existence of a "micro-fireball" in the middle of the transverse space due to the soft Pomeron exchange, which may be at the origin of the thermal character of multiparticle production in ep/pp collisions. After summing over uncorrelated multi-Pomeron exchanges, we find that the total dipole-dipole cross section obeys the Froissart unitarity bound.

17 pages, 4 figures, version 2: minor typos corrected, references added

References in corpus (8)

• The Pomeron and Gauge/String Duality
• A holographic model of deconfinement and chiral symmetry restoration
• Thermal Hadronization and Hawking-Unruh Radiation in QCD
• Multi-particle Production and Thermalization in High-Energy QCD
• A QCD motivated model for soft interactions at high energies
• High-energy strong interactions: from `hard' to `soft'
• Reggeon exchange from gauge/gravity duality
• Schwinger Pair Creation of Particles and Strings

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