ttH, ttZ and ttW measurements at LHC and top quark compositeness

TL;DR

This paper explores potential explanations for observed excesses in ttH, ttZ, and ttW channels at the LHC, suggesting they may originate from top quark compositeness or heavy vector-like quarks, with future data needed for clarification.

Contribution

It proposes a composite interpretation of top quark anomalies, linking excesses to heavy quarks or four-top final states, offering a new perspective on LHC observations.

Findings

Excesses may stem from top quark compositeness or heavy vector-like quarks.

Data at 13 TeV could clarify the origin of these excesses.

Interpretation challenges due to overlapping signals and systematics.

Abstract

This note is an attempt to interpret some excesses, not yet significant due to systematics, observed by ATLAS and CMS in various analyses related to the standard channels ttH, ttZ and ttW. It is argued, within a composite interpretation of top particles, that such excesses are not necessarily related to these channels themselves, although this is not excluded, but due to the underlying presence of either vector-like heavy quarks tprime,bprime or to final states as predicted in composite theories. The outcome of this discussion is that although it will not be easy to reach an exclusive interpretation, the data collected at 13 TeV may establish the origin of this effect as coming from the four top quark topology.