Scattering amplitudes for particles and strings in six-dimensional (2,0) theory

TL;DR

This paper analyzes low-energy particle scattering off a BPS string in six-dimensional (2,0) theory, deriving the S-matrix through symmetry and explicit perturbative calculations.

Contribution

It provides the first explicit perturbative calculation of scattering amplitudes in (2,0) theory involving tensor multiplets and BPS strings.

Findings

S-matrix largely determined by symmetry considerations

Explicit lowest-order scattering amplitudes calculated

Results valid for energies much lower than string tension's square root

Abstract

We study the scattering of low-energy tensor multiplet particles against a BPS saturated cosmic string. We show that the corresponding S-matrix is largely determined by symmetry considerations. We then apply a specific supersymmetric model of (2,0) theory and calculate the scattering amplitudes to lowest non-trivial order in perturbation theory. Our results are valid as long as the energy of the incoming particle is much lower than the square root of the string tension. The calculation involves the quantization of a (2,0) tensor multiplet and the derivation of an effective action describing the low-energy particles in the presence of a nearly BPS saturated string.