Production of light stringy states

TL;DR

This paper explores the potential to produce and detect light stringy states at the LHC, which are localized at D-brane intersections and could be lighter than the string scale, offering new signatures beyond traditional string resonances.

Contribution

It provides a detailed calculation of the tree-level scattering amplitude involving light stringy states and gauge bosons, applicable to D-brane models of the Standard Model.

Findings

Light stringy states can have masses below the string scale.

Computed scattering amplitudes for light stringy states interacting with gauge bosons.

Potential LHC signatures for light stringy states in low string scale scenarios.

Abstract

We discuss the direct production of light stringy states. Those states correspond to the lightest stringy excitations localized at the intersection of two D-brane stacks and their mass can be parametrically smaller than the string scale. Thus in a low string scale scenario one may observe stringy signatures at LHC even in the absence of the usual string resonances. We compute the tree level string scattering amplitude involving two gauge bosons and two such light stringy states. We give the squared amplitude summed over all polarization and gauge configuration and eventually apply the result to the quark sector of a D-brane realization of the Standard Model.