Fermions hard scattering from superstrings

TL;DR

This paper investigates high-energy fermion and gluon scattering in gauge theories using type IIB superstring theory, revealing angular selection rules, partonic structures, and Regge behavior in the dual gauge field context.

Contribution

It provides explicit calculations of scattering amplitudes involving fermions and gluons in superstring theory, connecting them to gauge theory predictions and uncovering new selection rules and Regge behavior.

Findings

Derived angular selection rules for four-glueball scattering.

Calculated partonic structure of scattering cross sections.

Established Regge behavior in high-energy scattering amplitudes.

Abstract

We study high-energy scattering at fixed angle in the planar limit of non-Abelian gauge field theories from type IIB superstring theory scattering amplitudes. Firstly, we consider four-glueball scattering described in terms of the four-dilaton string theory scattering amplitude. We explicitly calculate some angular integrals of four scalar spherical harmonics on the five sphere leading to selection rules for several scattering processes. Then, we consider the high-energy limit of the four-dilatino scattering amplitude in type IIB superstring theory, which allows to describe four spin-1/2 fermions scattering in the dual gauge field theory. In both cases the partonic structure of the scattering cross sections is obtained. The Regge behavior is also obtained. In addition, we study certain related aspects by considering the effective action constructed from IIB supergravity.