We perform a study of lepton-pair production in association with bottom quarks at the LHC based on the predictions obtained at next-to-leading order in QCD, both at fixed order and matched with a QCD parton shower. We consider a comprehensive set of observables and estimate the associated theoretical uncertainties by studying the dependence on the perturbative QCD scales (renormalisation, factorisation and shower) and by comparing different parton-shower models (Pythia8 and Herwig++) and matching schemes (MC@NLO and POWHEG). Based on these results, we propose a simple procedure to include bottom-quark effects in neutral-current Drell-Yan production, going beyond the standard massless approximation. Focusing on the inclusive lepton-pair transverse-momentum distribution p⊥ℓ+ℓ−, we quantify the impact of such effects on the tuning of the simulation of charged-current Drell-Yan observables and the W-boson mass determination.
Lepton-pair production in association with a bb¯ pair and the determination of the W boson mass / E. Bagnaschi, F. Maltoni, A. Vicini, M. Zaro. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2018:7(2018 Jul 16), pp. 101.1-101.47. [10.1007/JHEP07(2018)101]
Lepton-pair production in association with a bb¯ pair and the determination of the W boson mass
A. Vicini;M. Zaro
2018
Abstract
We perform a study of lepton-pair production in association with bottom quarks at the LHC based on the predictions obtained at next-to-leading order in QCD, both at fixed order and matched with a QCD parton shower. We consider a comprehensive set of observables and estimate the associated theoretical uncertainties by studying the dependence on the perturbative QCD scales (renormalisation, factorisation and shower) and by comparing different parton-shower models (Pythia8 and Herwig++) and matching schemes (MC@NLO and POWHEG). Based on these results, we propose a simple procedure to include bottom-quark effects in neutral-current Drell-Yan production, going beyond the standard massless approximation. Focusing on the inclusive lepton-pair transverse-momentum distribution p⊥ℓ+ℓ−, we quantify the impact of such effects on the tuning of the simulation of charged-current Drell-Yan observables and the W-boson mass determination.File | Dimensione | Formato | |
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