Papers › Improving t t̅ reconstruction in the dilepton channel at future lepton colliders
Improving t t̅ reconstruction in the dilepton channel at future lepton colliders
P. Martín-Ramiro, J. M. Moreno
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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 t̅ 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 t̅ 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 t̅ sample, our reconstruction method allows to calculate these observables with an accuracy better than 1 %.
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