Improving \(t \bar{t}\) reconstruction in the dilepton channel at future lepton colliders

A future lepton collider, such as the proposed CLIC or ILC, would allow to study top quark properties with unprecedented precision. In this paper, we present a method to reconstruct the \(t \bar{t}\) decay in the dilepton channel at future \(e^+e^-\) colliders. We derive a simple, closed analytical...

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Bibliographic Details
Published inarXiv.org
Main Authors Martín-Ramiro, P, Moreno, J M
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.03.2020
Subjects
Helicity
Leptons
Mathematical analysis
Neutrinos
Optimization
Quarks
Reconstruction
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Summary:A future lepton collider, such as the proposed CLIC or ILC, would allow to study top quark properties with unprecedented precision. In this paper, we present a method to reconstruct the \(t \bar{t}\) decay in the dilepton channel at future \(e^+e^-\) colliders. We derive a simple, closed analytical expression for the neutrino four-momenta as a function of the \(W\) boson mass and develop a maximization procedure to find the optimal solution for the reconstruction of the full \(t \bar{t}\) event. We show that our method is able to reconstruct neutrino four-momenta with an error of less than \(2 \, \%\) in \(60 \, \%\) of the times. Finally, we test the performance of this reconstruction method in the calculation of the helicity fractions of the \(W\) boson. A precise measurement of these observables could be used to probe new physics effects in the \(Wtb\) vertex. We find that, from a large \(t \bar{t}\) sample, our reconstruction method allows to calculate these observables with an accuracy better than \(1 \, \%\).
ISSN:2331-8422