The nominal signal tt¯ MC sample was generated assuming a top-quark mass of mt = 172.5 GeV using the Powheg- Box (v1) event generator [21–23], referred to in the fol- lowing as Powheg, providing NLO QCD matrix-element (ME) calculations [24]. The hdamp parameter that regulates ...
In the Standard Model (SM) this interaction has a (V − A) structure, where V and A refer to the vector and axial vector components of the weak coupling. The W boson, which is produced as a real particle in the decay of top quarks, possesses a polar- isation which can be left-...