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The standard approaches for describing top quark production and its decaydynamics are currently mostly either based on the narrow-width (NW) limit or onoff-shell fixed-order calculations. In this article we present a factorisedapproach for boosted top quarks that combines the properties of the NW limitand off-shell computations accounting for the dominant off-shell effects in anexpansion in $m_t/Q$ with the hard scattering scale $Q$. We discuss the keyideas of our approach and show some preliminary results at tree-level.

Beyond the Narrow-Width Limit for Off-Shell and Boosted Differential Top Quark Decays