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We present a Monte Carlo generator that implements significant theoreticalimprovements in the simulation of top-quark pair production and decay at theLHC. Spin correlations and off-shell effects in top-decay chains are describedin terms of exact matrix elements for $p p \to\ell^+\nu_{\scriptscriptstyle\ell}\, l^-\bar{\nu}_{\scriptscriptstyle l} b\bar{b}$ at NLO QCD, where the leptons $\ell$ and $l$ belong to differentfamilies, and $b$ quarks are massive. Thus, the contributions from $t\bar{t}$and $Wt$ single-top production as well as their quantum interference are fullyincluded. Matrix elements are matched to the Pythia8 parton shower using arecently proposed method that allows for a consistent treatment of resonancesin the POWHEG framework. These theoretical improvements are especiallyimportant for the interpretation of precision measurements of the top-quarkmass, for single-top analyses in the $Wt$ channel, and for $t\bar{t}$ and $Wt$backgrounds in the presence of jet vetoes or cuts that enhance off-shelleffects. The new generator is based on a process-independent interface of theOpenLoops amplitude generator with the POWHEGBOX framework.

An NLO+PS generator for $t\bar{t}$ and $Wt$ production and decay including non-resonant and interference effects