Top-pair production and decay at NLO matched with parton showers

Abstract

We present a next-to-leading order (NLO) calculation of $t\bar{t}$ production in hadronic collisions interfaced to shower generators according to the POWHEG method. We start from an NLO result from previous work, obtained in the zero width limit, where radiative corrections to both production and decays are included. The POWHEG interface required an extension of the POWHEG BOX framework, in order to deal with radiation from the decay of resonances. This extension is fully general (i.e. it can be applied in principle to any process considered in the zero width limit), and is here applied for the first time. In order to perform a realistic simulation, we introduce finite width effects using different approximations, that we validated by comparing with published exact NLO results. We have interfaced our POWHEG code to the PYTHIA8 shower Monte Carlo generator. At this stage, we dealt with novel issues related to the treatment of resonances, especially with regard to the initial scale for the shower that needs to be set appropriately. This procedure affects, for example, the fragmentation function of the b quark, that we have studied with particular attention. We believe that the tool presented here improves over previous generators for all aspects that have to do with top decays, and especially for the study of issues related to top mass measurements that involve B hadrons or b jets. The work presented here also constitutes a first step towards a fully consistent matching of NLO calculations involving intermediate resonances decaying into coloured particles, with parton showers.

Minor changes: improved few sentences, added 1 explanatory figure in sec. 1. Now it matches the version published in JHEP

References in corpus (12)

• Parton distributions for the LHC
• New parton distributions for collider physics
• Parton Distributions for LHC
• Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
• NLO QCD corrections to WWbb production at hadron colliders
• NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
• Vector boson plus one jet production in POWHEG
• Measurement of the t t-bar production cross section in pp collisions at sqrt(s) = 7 TeV with lepton + jets final states
• Measurement of the $t\bar{t}$ production cross-section as a function of jet multiplicity and jet transverse momentum in 7 TeV proton-proton collisions with the ATLAS detector
• NNLO QCD subtraction for top-antitop production in the $q\bar{q}$ channel
• Top-quark processes at NLO in production and decay
• Hadroproduction of $W^{+}{W}^{-}b\bar{b}$ at NLO accuracy matched with shower Monte Carlo programs

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