Manifestations of Top Compositeness at Colliders

TL;DR

This paper investigates the potential signatures of a composite right-handed top quark at colliders, analyzing modifications to top couplings and four-top production to identify observable effects at the LHC and Tevatron.

Contribution

It provides a comprehensive analysis of dimension six operators affecting top quark interactions and assesses collider sensitivities to top compositeness scales up to 5 TeV.

Findings

Low compositeness scales are possible due to cancellations in tar{t} rates.

Kinematic distributions can improve sensitivity to compositeness.

LHC with 100 fb^{-1} can probe scales up to 5 TeV.

Abstract

We explore the possibility that the right-handed top quark is composite, identifying possible signatures of compositeness and how they might manifest themselves at the LHC and Tevatron. We perform a complete analysis of the dimension six modifications of the top coupling to gluons and find that cancellations among operators in the t\bar{t} rate allow for very low compositeness scales, but this can be drastically improved by looking at kinematic distributions. Turning to the LHC, we examine four top production from a dimension six four-top operator and estimate the LHC with 100 {\rm fb}^{-1} collected luminosity to be sensitive to compositeness scales as high as 5 TeV.