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We perform a study of lepton-pair production in association with bottomquarks at the LHC based on the predictions obtained at next-to-leading order inQCD, both at fixed order and matched with a QCD parton shower. We consider acomprehensive set of observables and estimate the associated theoreticaluncertainties by studying the dependence on the perturbative QCD scales(renormalisation, factorisation and shower) and by comparing differentparton-shower models (Pythia8 and Herwig++) and matching schemes(MadGraph5_aMC@NLO and POWHEG). Based on these results, we propose a simpleprocedure to include bottom-quark effects in neutral-current Drell-Yanproduction, going beyond the standard massless approximation. Focusing on theinclusive lepton-pair transverse-momentum distribution $p_{\bot}^{l^+l^-}$, wequantify the impact of such effects on the tuning of the simulation ofcharged-current Drell-Yan observables and the $W$-boson mass determination.

Lepton-pair production in association with a $b\bar{b}$ pair and the determination of the $W$ boson mass