S-matrix unitarity, impact parameter profiles, gluon saturation and high-energy scattering

Signatures of gluon saturation in high energy scattering

Unitarity and the Holographic S-Matrix

The bulk S-Matrix can be given a non-perturbative definition in terms of the flat space limit of AdS/CFT. We show that the unitarity of the S-Matrix, ie the optical theorem, can be derived by studying the behavior of the OPE and the conformal block decomposition in the flat space limit. When applied to perturbation theory in AdS, this gives a holographic derivation of the cutting rules for Feyn...

ar X iv : h ep - p h / 03 01 08 4 v 1 1 3 Ja n 20 03 From Static Potentials to High - Energy Scattering

γ * L p Reaktionen und die stossparameterabhängige Gluonverteilung des Protons xG(x, Q 2 , | b ⊥ |) zeigen Sättigung bei extrem hohen Energien in¨Ubereinstimmung mit Unitaritätsgrenzen. Abstract We develop a loop-loop correlation model for a unified description of static color dipole potentials , confining QCD strings, and hadronic high-energy reactions with special emphasis on saturation effec...

Gluon shadowing and unitarity effects

New data from HERA experiment on deep inelastic scattering have been used to parametrize nucleon and Pomeron structure functions. Within the Gribov theory, the parameterizations were employed to calculate gluon shadowing for various heavy ions. The latter was compared with predictions from other models. Calculations of multiplicity reduction due to gluon shadowing for d+Au collisions at forward...

Polarized hyperons from pA scattering in the gluon saturation regime

We study the production of transversely polarized Λ hyperons in high-energy collisions of protons with large nuclei. The large gluon density of the target at saturation provides an intrinsic semi-hard scale which should naturally allow for a weakcoupling QCD description of the process in terms of a convolution of the quark distribution of the proton with the elementary quark–nucleus scattering ...