Matching NLO QCD and parton showers in heavy flavour production

Abstract

We apply the MC@NLO approach to the process of heavy flavour hadroproduction. MC@NLO is a method for matching next-to-leading order (NLO) QCD calculations and parton shower Monte Carlo (MC) simulations, with the following features: fully exclusive events are generated, with hadronisation according to the MC model; total rates are accurate to NLO; NLO results for distributions are recovered upon expansion in $\as$; hard emissions are treated as in NLO computations while soft/collinear emissions are handled by the MC simulation, with the same logarithmic accuracy as the MC; matching between the hard and soft regions is smooth, and no intermediate integration steps are necessary. The method was applied previously to the hadroproduction of gauge boson pairs, which at NLO involves only initial-state QCD radiation and a unique colour structure. In heavy flavour production, it is necessary to include contributions from final-state QCD radiation and different colour flows. We present illustrative results on top and bottom production at the Tevatron and LHC.

arXiv comment70 pages Latex; 38 figures included. Minor modifications to the text, units in figs. 7,8,10,11 corrected

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• Measurement of beauty production from dimuon events at HERA
• Top quark mass studies with $t\bar{t}j$ at the LHC
• Search for the Higgs boson in the H->WW->lnujj decay channel at sqrt(s) = 7 TeV with the ATLAS detector
• Heavy-flavor particle correlations in STAR via electron azimuthal correlations with D^0 mesons
• Back-to-back azimuthal correlations in Z+jet events at high transverse momentum in the TMD parton branching method at next-to-leading order
• Higher-order QCD effects in the Higgs to ZZ search channel at the LHC
• Measurement of the inclusive $t\bar{t}$ production cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV and determination of the top quark pole mass
• Heavy quark radiation in NLO+PS POWHEG generators
• New Approach to Parton Shower MC's for Precision QCD Theory: HERWIRI1.0(31)
• External leg corrections in the unitarity method
• Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\sqrt{s}=7$TeV using the ATLAS detector
• Search for a Standard Model Higgs boson in the mass range 200-600 GeV in the H->ZZ->llqq decay channel
• Combination of measurements of the top quark mass from data collected by the ATLAS and CMS experiments at $\sqrt{s}$ = 7 and 8 TeV
• HERWIRI1.0: MC Realization of IR-Improved DGLAP-CS Parton Showers
• MC@NLO for the hadronic decay of Higgs bosons in associated production with vector bosons
• Heavy-flavor hadro-production with heavy-quark masses renormalized in the $\overline{\mathrm{MS}}$, MSR and on-shell schemes
• Search for a heavy particle decaying to a top quark and a light quark in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Measurements of $e^{+}{e}^{-}$ pairs from open heavy flavor in $p$+$p$ and $d$+$A$ collisions at $\sqrt{s_{NN}}=200$ GeV
• Measurement of Inclusive and Dijet D* Meson Cross Sections in Photoproduction at HERA
• Using single top rapidity to measure V_td, V_ts, V_tb at hadron colliders
• Computational challenges for MC event generation
• Collinearity approximations and kinematic shifts in partonic shower algorithms
• Effective Field Theory in the top sector: do multijets help?
• Measurements of charge and CP asymmetries in $b$-hadron decays using top-quark events collected by the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV
• Top Background Extrapolation for H -> WW Searches at the LHC
• Measurement of the $b\overline{b}$ dijet cross section in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the Forward-Backward Asymmetry in the Production of $B^{\pm }$ Mesons in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV
• From Tevatron's top and lepton-based asymmetries to the LHC
• A Comparison of two different jet algorithms for the top mass reconstruction at the LHC
• Single Slepton Production in association with a single Top Quark at the Tevatron and LHC
• Complete NLO corrections to top-quark pair production with isolated photons
• High Energy Photoproduction
• Status of the observed and predicted b bar{b} production at the Tevatron
• NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICE
• Resummation Effects in the Search of SM Higgs Boson at Hadron Colliders
• In Search of Lonely Top Quarks at the Tevatron
• In Search of Lonely Top Quarks at the Tevatron
• Gaining analytic control of parton showers
• Study of perturbative QCD predictions at next-to-leading order and beyond for \pp -> H -> gamma gamma + X
• Measurement of the Top Quark Mass in the Lepton+Jets Channel Using the Lepton Transverse Momentum
• Measurement of the mass difference between top and anti-top quarks in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $\sqrt{s}=7$ and 8 TeV
• A new analysis technique to measure the W Production Charge Asymmetry at the Tevatron
• Electroweak Gauge-Boson Production in Association with b Jets at Hadron Colliders
• Heavy-flavor azimuthal correlations of D mesons
• Improving top quark induced charge asymmetries at the LHC using ttbar transverse momentum
• Measurement of Beauty and Charm Photoproduction using Semi-muonic Decays in Dijet Events at HERA
• Charm and bottom photoproduction at HERA with MC@NLO
• Four top final states with NLO accuracy in perturbative QCD: 4 lepton channel
• Drell-Yan Production of Z' in the Three-Site Higgsless Model at the LHC
• The SAGEX Review on Scattering Amplitudes, Chapter 12: Amplitudes and collider physics
• Hadronic production of top-quark pairs in association with a pair of leptons in the POWHEG BOX framework
• Theoretical Uncertainties in Electroweak Boson Production Cross Sections at 7, 10, and 14 TeV at the LHC
• Overview of charm production at RHIC
• Heavy-quark production at large rapidities at hadron colliders
• Heavy-flavor correlation measurements via electron azimuthal correlations with open charm mesons
• Anomalous Wtb coupling and forward-backward asymmetry of top quark production at the Tevatron
• $D$-meson production in high energy $pA$ collisions within the QCD color dipole transverse momentum representation
• Simulation of a Cross Section and Mass Measurement of a SM Higgs Boson in the H->WW->lvlv Channel at the LHC
• Hadroproduction of $W^{+}{W}^{-}b\bar{b}$ at NLO accuracy matched with shower Monte Carlo programs
• Matrix-Element Corrections to Parton Shower Simulations for Higgs Hadroproduction
• Reconstructing top quark-antiquark events with one lost jet
• Top-Quark Physics at the LHC
• Hard QCD at hadron colliders
• Top quark in theory
• Measurement of the forward-backward asymmetry in ${\Lambda }_b^0$ and ${\overline{\Lambda }}_b^0$ baryon production in $p\overline{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Measurement of top quark polarization in $t\overline{t}$ lepton+jets final states
• First measurements of beauty quark production at {\surd}s = 7 TeV with the CMS experiment
• Bottom Pair Production and Search for Heavy Resonances
• NLO QCD corrections to off-shell $t\bar{t}{W}^{\pm }$ production at the LHC: Correlations and Asymmetries
• Monte Carlo event generators & the top quark forward--backward asymmetry
• Standard and SUSY Higgs production at the LHC
• Measurements of jet multiplicity and jet transverse momentum in multijet events in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for a heavy vector boson decaying to two gluons in {$\boldmath{p\bar{p}}$} collisions at {$\boldmath{\sqrt{s}=1.96}$ TeV
• Measurement of the inclusive $t\bar{t}$ production cross section in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$= 7 TeV with the ATLAS detector using support vector machines
• QCD at hadron colliders
• APACIC++, A Parton Cascade in C++
• Apacic++ 2.0, A Parton Cascade In C++
• Heavy-quark dynamics in a hydrodynamically evolving medium
• Five-flavour scheme predictions for $t\bar{t}b\bar{b}$ at next-to-leading order accuracy
• Hadroproduction of four top quarks in the POWHEG BOX
• Recent Findings from Heavy-Flavor Angular Correlation Measurements in Hadronic Collisions
• Top quark pair production cross-section results at LHC in final states with tau or no leptons
• Production of massless bottom jets in ppbar and pp collisions at next-to-leading order of QCD
• New Applications of Resummation in Non-Abelian Gauge Theories: QED X QCD Exponentiation for LHC Physics, IR-Improved DGLAP Theory and Resummed Quantum Gravity
• Latest Results on Bottom Spectroscopy and Production with CDF
• LHC searches for physics beyond the Standard Model with top quarks
• Prospects for b-quark production cross section measurements in pp collisions at the LHC
• Differential top pair cross section and top anti-top plus jets Physics
• Vector boson plus multijet production
• Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions