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

2024/01/10 by Hoang, André H., Plätzer, Simon, Regner, Christoph +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2401.05035

Abstract

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

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