Hadroproduction of tt¯bb¯ final states at LHC

predictions at NLO accuracy matched with parton shower

M. V. Garzelli, A. Kardos, Z. Trócsányi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Abstract: We present predictions for the hadroproduction of tt¯bb¯ final states at the LHC with collision energies (Formula Presented.) = 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 significantly 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 collaboration. For these predictions, we present the theoretical uncertainty bands, related to both scale and PDF variations. We find that these uncertainties are only moderately affected by the change of the collision energy.

Original languageEnglish
Article number83
Pages (from-to)1-19
Number of pages19
JournalJournal of High Energy Physics
Volume2015
Issue number3
DOIs
Publication statusPublished - 2015

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showers
partons
collisions
predictions
kinematics
energy
decay

Keywords

  • Hadronic Colliders
  • NLO Computations

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Hadroproduction of tt¯bb¯ final states at LHC : predictions at NLO accuracy matched with parton shower. / Garzelli, M. V.; Kardos, A.; Trócsányi, Z.

In: Journal of High Energy Physics, Vol. 2015, No. 3, 83, 2015, p. 1-19.

Research output: Contribution to journalArticle

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AB - Abstract: We present predictions for the hadroproduction of tt¯bb¯ final states at the LHC with collision energies (Formula Presented.) = 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 significantly 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 collaboration. For these predictions, we present the theoretical uncertainty 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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