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Next-to-leading order QCD effects and the top quark mass measurements at the LHC
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It is anticipated that a number of techniques to measure the top quark mass at the LHC will yield m_top with uncertainties of about 0.5-1 percent. These uncertainties are mostly theoretical; they are usually estimated using parton shower Monte Carlo programs whose reliability at this level of precision is difficult to assess. The goal of this paper is to contrast those estimates with the results of NLO QCD computations for a few observables, often discussed in the context of high-precision top quark mass measurements at the LHC. In particular, we study the NLO QCD corrections to the invariant mass distribution of a charged lepton and a B-meson in lepton+jets channels. In the dilepton channel we investigate the invariant mass distribution of a charged lepton and a b-jet, the average energy of the two leptons and the average energy of the b-jets from top decays.
Forward citations
Cited by 2 Pith papers
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Towards NNLO QCD predictions for off-shell top-quark pair production and decays
The first NNLO QCD prediction for off-shell W+W-bbbar production with massive bottom quarks at the LHC, using a double-pole approximation for the two-loop virtual and an on-shell matching for non-factorisable corrections.
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Top-quark mass interpretation from simulation of top-flavoured mesons
Comparing Pythia top-pair events to fictitious top-meson samples linked by HQET yields a 200–300 MeV shift between the Monte Carlo top mass and the pole mass.
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