Selection and reconstruction of the top quarks in the all-hadronic decays at a Linear Collider

TL;DR

This paper proposes a new method for reconstructing top quarks in all-hadronic decays at a Linear Collider that avoids kinematic fits and assumptions on invariant masses, making it more robust against uncertainties.

Contribution

It introduces a novel top quark reconstruction technique that does not rely on kinematic fitting or invariant mass assumptions, tested with full detector simulation.

Findings

Method reduces sensitivity to top-mass uncertainties.

First application of full detector simulation for this reconstruction.

Effective background suppression demonstrated.

Abstract

A method of reconstruction of the top quarks produced in the process E+E- -> t\bar{t} -> 6 jets at a Linear Collider (LC) is proposed. The approach does not involve a kinematic fit, as well as assumptions on the invariant masses of the dijets originating from the decays of W bosons and, therefore, the method is expected to be less sensitive to theoretical and experimental uncertainties on the top-mass measurement than traditional reconstruction methods. For the first time, the reconstruction of the top quarks was investigated using the full LC detector simulation after taking into account the background arising from QCD multi-jet production.