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

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [1];  [2];  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. INFN, Milano (Italy)
  3. Univ. of Oxford, Oxford (United Kingdom)

We present a next-to-leading order (NLO) calculation of tt¯ 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. As a result, 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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1226308
Report Number(s):
FERMILAB-PUB-14-504-T; OUTP-14-17P; arXiv eprint number arXiv:1412.1828; TRN: US1500556
Journal Information:
Journal of High Energy Physics (Online), Vol. 2015, Issue 4; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 98 works
Citation information provided by
Web of Science

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Top quark pair production and decay at hadron colliders text January 2004
Vector boson plus one jet production in POWHEG text January 2010
Parton distributions for the LHC text January 2009
MadGraph 5 : Going Beyond text January 2011
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NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders text January 2012
Measurement of the $ \mathrm{t}\overline{\mathrm{t}} $ production cross section in the all-jet final state in pp collisions at $ \sqrt{s}=7 $ TeV journal May 2013

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Addendum to: A Theoretical Study of Top-Mass Measurements at the LHC Using NLO+PS Generators of Increasing Accuracy text January 2019
Measurement of the cross-section for producing a W boson in association with a single top quark in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV with ATLAS journal January 2018
Measurements of b-jet tagging efficiency with the ATLAS detector using t t ¯ $$ t\overline{t} $$ events at s = 13 $$ \sqrt{s}=13 $$ TeV journal August 2018
Top-pair production at the LHC through NNLO QCD and NLO EW text January 2017
Measurement of differential cross sections for top quark pair production using the lepton + jets final state in proton-proton collisions at 13 TeV journal May 2017
Probing the top-quark width through ratios of resonance contributions of e + e − → W + W − b b ¯ $$ {\mathrm{e}}^{+}{\mathrm{e}}^{-}\to {\mathrm{W}}^{+}{\mathrm{W}}^{-}\mathrm{b}\overline{\mathrm{b}} $$ journal March 2016
Evidence for the Associated Production of a Single Top Quark and a Photon in Proton-Proton Collisions at s = 13 TeV journal November 2018
Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum in $$\sqrt{s}=13$$s=13 $$\text {TeV}$$TeV pp collisions using the ATLAS detector journal February 2020
Measurement of the top quark pair production cross section in dilepton final states containing one τ lepton in pp collisions at √s = 13 TeV text January 2020
Top-pair production at the LHC through NNLO QCD and NLO EW text January 2017
Measurement of the top quark Yukawa coupling from t t ¯ kinematic distributions in the lepton + jets final state in proton-proton collisions at s = 13     TeV journal October 2019
Search for a low-mass $\tau^+\tau^-$ resonance in association with a bottom quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV text January 2019
Evidence for the Associated Production of a Single Top Quark and a Photon in Proton-Proton Collisions at √s = 13 TeV text January 2018
Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at $\sqrt{s} = 13\,\text {TeV}$ text January 2019
NLO electroweak corrections to off-shell top-antitop production with leptonic decays at the LHC text January 2016
Measurement of the integrated and differential t t ¯ production cross sections for high- p T top quarks in p p collisions at s = 8 TeV journal October 2016
NLO and off-shell effects in top quark mass determinations journal July 2018
NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron text January 2016
Multi-jet merged top-pair production including electroweak corrections journal April 2018
Off-shell production of top-antitop pairs in the lepton+jets channel at NLO QCD journal February 2018
Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal March 2019
Measurement of the top quark pair production cross section in dilepton final states containing one τ lepton in pp collisions at √s= 13 TeV text January 2020
NLO QCD+EW predictions for HV and HV +jet production including parton-shower effects text January 2017
Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s} =$ 13 TeV text January 2019
Search for pair production of heavy vectorlike quarks decaying into hadronic final states in p p collisions at s = 13 TeV with the ATLAS detector journal November 2018
Search for a heavy resonance decaying into a Z boson and a vector boson in the $ \nu \overline{\nu}\mathrm{q}\overline{\mathrm{q}} $ final state text January 2018
Search for supersymmetry in final states with two same-sign or three leptons and jets using 36 fb−1 of s = 13 $$ \sqrt{s}=13 $$ TeV pp collision data with the ATLAS detector journal September 2017
Search for direct production of supersymmetric partners of the top quark in the all-jets final state in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV journal October 2017
Search for charged Higgs bosons decaying into top and bottom quarks at s = 13 $$ \sqrt{s}=13 $$ TeV with the ATLAS detector journal November 2018
Search for pair and single production of vectorlike quarks in final states with at least one Z boson decaying into a pair of electrons or muons in p p collision data collected with the ATLAS detector at s = 13 TeV journal December 2018
Measurement of associated production of a $$\mathrm {W}$$ W boson and a charm quark in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te journal March 2019
Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s} =$ 13 TeV text January 2020
Measurement of differential cross-sections of a single top quark produced in association with a W boson at $$\sqrt{s}={13}{\text {TeV}}$$ s = 13 TeV with ATLAS journal March 2018
Measurement of differential cross sections for top quark pair production using the lepton+jets final state in proton-proton collisions at 13 TeV text January 2017
Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton + jets events from p p collisions at s = 13 TeV journal June 2018
Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s} =$ 13 TeV text January 2019
Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt s$ = 13 TeV text January 2020
NNLOPS accurate associated HZ production with H → b b ¯ $$ H\to b\overline{b} $$ decay at NLO journal November 2018
Search for a heavy resonance decaying into a Z boson and a vector boson in the $ \nu \overline{\nu}\mathrm{q}\overline{\mathrm{q}} $ final state text January 2018
Heavy quark radiation in NLO+PS POWHEG generators text January 2017
Top quark mass studies with t t ¯ j $$ t\overline{t}j $$ at the LHC journal March 2018
Measurement of the top quark mass with lepton+jets final states using $$\mathrm {p}$$ p $$\mathrm {p}$$ p collisions at $$\sqrt{s}=13\,\text {TeV} $$ s = 13 TeV journal November 2018
Measurement of associated Z + charm production in proton–proton collisions at $$\sqrt{s} = 8$$ s = 8 $$\,\text {TeV}$$ TeV journal April 2018
Coherent showers in decays of colored resonances journal October 2019
Measurement of normalized differential t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ cross sections in the dilepton channel from pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV journal April 2018
Measurement of the top quark pair production cross section in dilepton final states containing one τ lepton in pp collisions at $$ \sqrt{s} $$ = 13 TeV journal February 2020
Effective field theory approach to heavy quark fragmentation text January 2016
Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV in the ATLAS detector journal June 2015
NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron text January 2016
Multi-jet merged top-pair production including electroweak corrections text January 2018
Addendum to: A theoretical study of top-mass measurements at the LHC using NLO+PS generators of increasing accuracy journal October 2019
NLO and off-shell effects in top quark mass determinations text January 2017
Search for a low-mass $\tau^+\tau^-$ resonance in association with a bottom quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV text January 2019
Heavy quark radiation in NLO+PS POWHEG generators journal February 2018
NLO QCD+EW predictions for HV and HV+jet production including parton-shower effects text January 2017
Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton+jets final state in pp collisions at $\sqrt{s} =$ 13 TeV text January 2018
Addendum to: A theoretical study of top-mass measurements at the LHC using NLO+PS generators of increasing accuracy text January 2019
Measurement of differential cross sections for top quark pair production using the lepton+jets final state in proton-proton collisions at 13 TeV text January 2016

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