Abstract
The effects of the finite top quark width in the top pair production cross section close to the threshold are discussed in this talk. We introduce a t t ¯ cross section with a cut on the invariant masses of the top and antitop that can be calculated theoretically with effective field theory (EFT) methods. The matching procedure to implement the physical phase-space boundaries in the NRQCD framework (“phase-space matching”) is briefly outlined.
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