Hadroproduction of ttbb final states at LHC: predictions at NLO accuracy matched with Parton Showe

Garzelli, M. V. and Kardos, Ádám and Trócsányi, Zoltán (2015) Hadroproduction of ttbb final states at LHC: predictions at NLO accuracy matched with Parton Showe. JOURNAL OF HIGH ENERGY PHYSICS (3). ISSN 1126-6708

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Abstract

We present predictions for the hadroproduction of t¯tb¯b final states at the LHC with collision energies √s = 8 TeV and 14 TeV at NLO accuracy matched with parton shower, as obtained with PowHel+ PYTHIA. We quantify the effects of parton shower and hadronization. We find these are in general moderate except the effect of the decay of heavy particles, which can modify signifi- cantly some distributions, like that of the invariant mass of the two leading b-jets. We also show kinematic distributions obtained with cuts inspired to those recently employed by the CMS col- laboration. For these predictions, we present the theoretical un- certainty bands, related to both scale and PDF variations. We find that these uncertainties are only moderately affected by the change of the collision energy.

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