Top Mass Measurement at CLIC at 500 GeV

TL;DR

This study demonstrates that a 500 GeV CLIC collider can measure the top quark mass and width with precision comparable to the ILC, using detailed detector simulations and background control.

Contribution

It provides a detailed simulation-based analysis of top quark property measurements at CLIC, highlighting achievable precision under realistic conditions.

Findings

Top mass uncertainty of 0.08 GeV in fully-hadronic decays

Top mass uncertainty of 0.09 GeV in semi-leptonic decays

Comparable precision to ILC despite more challenging conditions

Abstract

We present a study of the capability of a 500 GeV e+e- collider based on CLIC technology for precision measurements of top quark properties. The analysis is based on full detector simulations of the CLIC_ILD detector concept using Geant4, including realistic background contributions from two photon processes. Event reconstruction is performed using a particle flow algorithm with stringent cuts to control the influence of background. The mass and width of the top quark are studied in fully-hadronic and semi-leptonic decays of ttbar pairs using event samples of signal and standard model background processes corresponding to an integrated luminosity of 100/fb. Statistical uncertainties of the top mass given by the invariant mass of its decay products of 0.08 GeV and 0.09 GeV are obtained for the fully-hadronic and the semi-leptonic decay channel, respectively, demonstrating that similar precision to that at ILC can be achieved at CLIC despite less favorable experimental conditions.