Polarization Effects on the $e+e- \to W^+W^-$ process with Large Extra Dimensions

TL;DR

This paper investigates how large extra dimensions influence the polarization of W boson pairs and electron beams in electron-positron collisions, proposing polarization measurements as a means to detect quantum gravity effects.

Contribution

It introduces polarization-based observables in the $e^+ e^- o W^+ W^-$ process to enhance sensitivity to large extra dimension effects and sets bounds on the string scale using collider data.

Findings

Transversely polarized W pair cross sections are sensitive to extra dimensions.

Right-handed electron beams improve detection prospects for quantum gravity effects.

Left-handed beams provide stronger bounds on the string scale.

Abstract

We study large extra dimension effects on the polarizations of the $W$ pair and electron beam at the $e^+ e^-\to W^+ W^-$ process. It is shown that the measurements of the cross section for transversely polarized $W$ pair with the right-handed electron beam remarkably enhance the possibilities to see the low scale quantum gravity effects. Higher Linear Collider bounds on the string scale in this model can be obtained by using the left-handed electron beam.