Top-quark physics at CLIC
June 10, 2020
The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC will be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV and 3 TeV. This contribution discusses the prospects for precision measurements of top-quark production and properties at CLIC. Based on a dedicated centre-of-mass energy scan around the top-quark pair production threshold, the top-quark mass can be determined with a precision of about 50 MeV in a theoretically well-defined manner. Other approaches to extract the top-quark mass at the first stage of CLIC make use of ISR photons or the direct reconstruction of the top quarks. The large number of top-quark pairs produced also allows competitive searches for Flavour Changing Neutral Current (FCNC) top-quark decays to charm quarks. At the high-energy stages of CLIC the top Yukawa coupling and CP properties in the ttH coupling can be studied, as well as the top-quark pair production through the vector-boson fusion. Expected limits on new physics contributions described in terms of Effective Field Theory (EFT) operator coefficients are presented, showing sensitivity of CLIC to mass scales up to 100 TeV.
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