The Compact Linear Collider (CLIC) is a concept for a next-generation accelerator at CERN, colliding electrons and positrons at energies up to several TeV. 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. However, the shape of the threshold cross section depends not only on the top-quark mass but also on other model parameters as the top-quark width, top Yukawa coupling and the strong coupling constant. We study the expected precision of the top-quark mass determination from the threshold scan. We use the most general fit approach with all relevant model parameters taken into account. In addition, we take the normalisation uncertainty into account as well as the expected constraints on the top Yukawa coupling and strong coupling constant from earlier experiments. We demonstrate that even in the most general approach the top-quark mass can be extracted with statistical precision of the order of 20 to 30 MeV. Additional improvement is expected if the running scenario is optimized. We also address the feasibility of the top Yukawa coupling determination from the threshold scan.
The Compact Linear Collider (CLIC) is a concept for a next-generation machine at CERN, 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.
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