Relating $e^+e^-$ annihilation to high energy scattering at weak and strong coupling

TL;DR

This paper investigates the relationship between e^+e^- annihilation final states and small-x hadronic wavefunctions in both weakly and strongly coupled regimes, revealing mathematical similarities and applications to interjet observables.

Contribution

It establishes a novel correspondence between e^+e^- annihilation and high energy scattering, providing exact solutions and insights into gluon distributions at small-x.

Findings

At strong coupling, energy distributions resemble shock waves in AdS space.

Constructed an exact solution to the BFKL evolution equation.

Argued the correspondence extends to energy correlation functions.

Abstract

We explore the correspondence between the final state in e^+e^- annihilation and the small-x hadronic wavefunction in the transverse plane both in weakly coupled QCD and strongly coupled N=4 SYM. At strong coupling, the virtual and static photon produced in e^+e^- annihilation can be treated as a shock wave propagating in AdS space leaving spherical energy and charge distributions on the boundary. This is shown to be mathematically identical to the computation of energy and charge distributions in the transverse plane generated by a high energy color singlet state. At weak coupling, the correspondence is useful in studying interjet observables. By performing the stereographic projection to the BFKL equation, we construct an exact solution to the evolution equation derived by Marchesini and Mueller, and find the angular distribution of small-x gluons in the interjet region. Finally we argue that the correspondence holds also for the energy correlation functions.