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We study hadronic jets that are tagged as heavy-flavoured, i.e. they containeither beauty or charm. In particular, we consider heavy-flavour jets that havebeen groomed with the Soft Drop algorithm. In order to achieve a deeperunderstanding of these objects, we apply resummed perturbation theory to jetsinitiated by a massive quark and we perform analytic calculations for twovariables that characterise Soft Drop jets, namely the opening angle and themomentum fraction of the splitting that passes Soft Drop. We compare ourfindings to Monte Carlo simulations. Furthermore, we investigate thecorrelation between the Soft Drop energy fraction and alternative observablesthat aim to probe heavy-quark fragmentation functions.

On heavy-flavour jets with Soft Drop