ADD and MLS signals in top-antitop final states

TL;DR

This paper investigates how the Minimal Length Scenario (MLS) affects top-antitop production at colliders within the ADD model of extra dimensions, showing significant effects on cross sections and potential experimental limits on the string scale.

Contribution

It introduces the impact of MLS as a natural regulator in the ADD model, providing new insights into collider phenomenology and constraints on the string scale M_S.

Findings

Sizable effects on cross sections due to graviton mediation for M_S of 1-10 TeV.

Distinct phenomenological differences between ADD and MLS-modified scenarios.

Potential to set experimental limits on the string scale M_S.

Abstract

We study top-(anti)quark pair production at the Tevatron and Large Hadron Collider (LHC) in the context of the Minimal Length Scenario (MLS) of the Arkani-Hamed, Dimopoulos and Dvali (ADD) model of extra dimensions (XDs). We show that sizable effects onto both the integrated and differential cross section due to graviton mediation are expected for a String scale, M_S, of O(1-10TeV) and several XDs, \delta, all compatible with current experimental constraints. Potential limits on M_S are extracted. We also highlight clear phenomenological differences between a simple ADD scenario and its modification based on using the MLS as a natural regulator for divergent amplitudes of virtual KK graviton exchange.