Prospects for improving top-quark mass measurement precision at future e~+e~- colliders

摘要

The Compact Linear Collider (CLIC) its a concept for a next-generation machine at CERX, colliding electrons and positrons at energies up to several TeV. Higgs boson studies, top-quark physics and searches for Beyond the Standard Model (BSM) phenomena are the three pillars of the CLIC research programme. One of the main goals at the initial CLIC running stage is the measurement of the top-quark mass and width in a scan of the beam energy through the pair production threshold. The baseline running scenario assumes the threshold scan with ten equidistant energy points. We present a study of optimizing the expected precision of the top-quark mass determination from the threshold scan. We used simulated data on top-quark pair production cross section and Monte Carlo methods to find the best set of collision energies to minimize uncertainties on the top-quark mass. Only by testing random configurations we found sets with statistical errors on mass and strong coupling constant over 20% smaller than those obtained for the baseline running scenario.