QCD radiation in the production of heavy colored particles at the LHC

Abstract

We present a study of effects of QCD radiation in the production of heavy colored states, employing inclusive multi-jet samples obtained by matching matrix elements and parton showers. We discuss several examples showing that matched samples are in general not only more accurate than a parton shower alone, but also often indispensable to make reliable predictions of beyond the Standard Model signals.

arXiv comment26 pages, 9 figures

References in corpus (38)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• MadGraph/MadEvent v4: The New Web Generation
• QCD Matrix Elements + Parton Showers
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• MadEvent: Automatic Event Generation with MadGraph
• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• Automatic Generation of Tree Level Helicity Amplitudes
• Single-top hadroproduction in association with a W boson
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Matching matrix elements and shower evolution for top-quark production in hadronic collisions
• CompHEP 4.4 - Automatic Computations from Lagrangians to Events
• Matching NLO QCD and parton showers in heavy flavour production
• SHERPA 1.alpha, a proof-of-concept version
• Correcting the Colour-Dipole Cascade Model with Fixed Order Matrix Elements
• Multijet matrix elements and shower evolution in hadronic collisions: W b bbar + n jets as a case study
• Matrix Elements and Parton Showers in Hadronic Interactions
• CalcHEP 2.3: MSSM, structure functions, event generation, batchs, and generation of matrix elements for other packages
• Gluino Stransverse Mass
• A practical Seedless Infrared-Safe Cone jet algorithm
• Measuring superparticle masses at hadron collider using the transverse mass kink
• Matching Matrix Elements and Parton Showers with HERWIG and PYTHIA
• Searching for Directly Decaying Gluinos at the Tevatron
• Model-Independent Jets plus Missing Energy Searches
• Weighing Wimps with Kinks at Colliders: Invisible Particle Mass Measurements from Endpoints
• The t W- Mode of Single Top Production
• Squark and Gluino Production with Jets
• Invariant mass distributions in cascade decays
• Weak boson fusion production of supersymmetric particles at the LHC
• Determining SUSY model parameters and masses at the LHC using cross-sections, kinematic edges and other observables
• SFITTER: SUSY Parameter Analysis at LHC and LC
• Supersymmetry Simulations with Off-Shell Effects for LHC and ILC
• Simulating W/Z+jets production at the Tevatron
• Simulating W/Z+jets production at the CERN LHC
• Colour connection structure of (supersymmetric) QCD ($2\to 2$) processes
• Squark Cascade Decays to Charginos/Neutralinos: Gluon Radiation

Cited by in corpus (195)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• MadGraph 5 : Going Beyond
• Event generation with SHERPA 1.1
• Tuning Monte Carlo Generators: The Perugia Tunes
• QCD matrix elements and truncated showers
• Merging meets matching in MC@NLO
• Simplified Models for a First Characterization of New Physics at the LHC
• Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
• Recombination Algorithms and Jet Substructure: Pruning as a Tool for Heavy Particle Searches
• Techniques for improved heavy particle searches with jet substructure
• NLO matrix elements and truncated showers
• A framework for Higgs characterisation
• Higgs pair production at the LHC with NLO and parton-shower effects
• A comprehensive approach to new physics simulations
• Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV
• Soft triple-real radiation for Higgs production at N3LO
• Hard photon production and matrix-element parton-shower merging
• Inclusive search for a vector-like T quark with charge 2/3 in pp collisions at sqrt(s) = 8 TeV
• Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from $\sqrt{s}=8$ TeV LHC Data
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• Physics searches at the LHC
• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• Bounding wide composite vector resonances at the LHC
• How low can SUSY go? Matching, monojets and compressed spectra
• Automating the POWHEG method in Sherpa
• Large Hadron Collider reach for supersymmetric models with compressed mass spectra
• Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV
• Revisiting slepton pair production at the Large Hadron Collider
• Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method
• Improved bounds on the heavy neutrino productions at the LHC
• Improving NLO-parton shower matched simulations with higher order matrix elements
• The Galactic Center Excess from the Bottom Up
• Nearly Degenerate Gauginos and Dark Matter at the LHC
• Compressed supersymmetry after 1/fb at the Large Hadron Collider
• Monojet versus rest of the world I: t-channel Models
• Probing Baryogenesis with Displaced Vertices at the LHC
• Heavy Flavor Simplified Models at the LHC
• Isolating Wt production at the LHC
• Gluino NLSP, Dark Matter via Gluino Coannihilation, and LHC Signatures
• Strong tW Scattering at the LHC
• THE TOOLS AND MONTE CARLO WORKING GROUP Summary Report from the Les Houches 2009 Workshop on TeV Colliders
• Challenges in Monte Carlo event generator software for High-Luminosity LHC
• Shedding Light on Neutrino Masses with Dark Forces
• Measurement of B anti-B Angular Correlations based on Secondary Vertex Reconstruction at sqrt(s)=7 TeV
• Measurements of jet multiplicity and differential production cross sections of Z + jets events in proton-proton collisions at sqrt(s) = 7 TeV
• Where the Sidewalk Ends: Jets and Missing Energy Search Strategies for the 7 TeV LHC
• Hunting Asymmetric Stops
• Single Productions of Colored Particles at the LHC: An Example with Scalar Leptoquarks
• Higgs characterisation via vector-boson fusion and associated production: NLO and parton-shower effects
• Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at sqrt(s) = 7 and 8 TeV
• A comprehensive approach to dark matter studies: exploration of simplified top-philic models
• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
• The Coannihilation Codex
• The Matrix Element Method and QCD Radiation
• Dark matter production through loop-induced processes at the LHC: the s-channel mediator case
• Hadronic final states in deep-inelastic scattering with Sherpa
• Determination of the top quark mass circa 2013: methods, subtleties, perspectives
• Unravelling $t\bar{t}h$ via the matrix element method
• Sgluon Pair Production to Next-to-Leading Order
• Searching for sgluons in multitop events at a center-of-mass energy of 8 TeV
• Evidence for electroweak production of four charged leptons and two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Charged Higgs boson production in association with a top quark in MC@NLO
• Automated Squark and Gluino Production to Next-to-Leading Order
• Measurement of the Z/gamma* + b-jet cross section in pp collisions at 7 TeV
• Novel reconstruction technique for New Physics processes with initial state radiation
• Distinguishing Dirac/Majorana Sterile Neutrinos at the LHC
• Simplified dark matter models with a spin-2 mediator at the LHC
• Exploring QCD uncertainties when setting limits on compressed SUSY spectra
• RECO level \sqrt{s}_{min} and subsystem \sqrt{s}_{min}: improved global inclusive variables for measuring the new physics mass scale in missing energy events at hadron colliders
• Very Light Scalar Top Quarks at the LHC
• Probing the CP-even Higgs Sector via $H_3\to H_2{H}_1$ in the Natural NMSSM
• Measurement of differential cross sections for Z boson production in association with jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Simplified Phenomenology for Colored Dark Sectors
• Improved Parton Showers at Large Transverse Momenta
• Automized Squark-Neutralino Production to Next-to-Leading Order
• Cornering Natural SUSY at LHC Run II and Beyond
• Measurements of the associated production of a Z boson and b jets in pp collisions at sqrt(s) = 8 TeV
• Modified Signals for Supersymmetry in the NMSSM with a Singlino-like LSP
• Stop on Top
• Matching Squark Pair Production at NLO with Parton Showers
• Measurements of the t-tbar production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections
• Electroweakino constraints from LHC data
• Measurement of electroweak-induced production of W gamma with two jets in pp collisions at sqrt(s) = 8 TeV and constraints on anomalous quartic gauge couplings
• NLO corrections to squark-squark production and decay at the LHC
• Unconventional phenomenology of a minimal two-Higgs-doublet model
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• Boosted decision trees in the era of new physics: a smuon analysis case study
• Ratios of $W$ and $Z$ cross sections at large boson $p_T$ as a constraint on PDFs and background to new physics
• Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $R_{D^{(\ast )}}$ anomalies
• Cornering pseudoscalar-mediated dark matter with the LHC and cosmology
• Searching for the minimal Seesaw models at the LHC and beyond
• Introduction to QCD
• Jets plus Missing Energy with an Autofocus
• Top Channel for Early SUSY Discovery at the LHC
• Simulating graviton production at hadron colliders
• Probing top anomalous couplings at the LHC with trilepton signatures in the single top mode
• Measurement of the differential cross sections for the associated production of a W boson and jets in proton-proton collisions at sqrt(s) = 13 TeV
• Higgs Pair Production: Improved Description by Matrix Element Matching
• Impact of LHC Searches on NLSP Top Squark and Gluino Mass
• Forward-Backward t tbar Asymmetry from Anomalous Stop Pair Production
• Amplification of endpoint structure for new particle mass measurement at the LHC
• W+Jets at CDF: Evidence for Top Quarks
• It's On: Early Interpretations of ATLAS Results in Jets and Missing Energy Searches
• Opening the black box of neural nets: case studies in stop/top discrimination
• Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
• Probing Color Octet Electrons at the LHC
• LHC Missing-Transverse-Energy Constraints on Models with Universal Extra Dimensions
• Recasting LHC searches for long-lived particles with MadAnalysis 5
• Controlling ISR in sparticle mass reconstruction
• Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at sqrt(s) = 8 TeV
• Measurement of the production cross section of a W boson in association with two b jets in pp collisions at sqrt(s) = 8 TeV
• Some remarks on dipole showers and the DGLAP equation
• Signatures of Dirac and Majorana Sterile Neutrinos in Trilepton Events at the LHC
• Signals of a superlight gravitino at the LHC
• A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC
• Deciphering Universal Extra Dimension from the top quark signals at the CERN LHC
• Top LHCb Physics
• Gauge Mediation Models with Vectorlike Matters at the LHC
• Matched predictions for Higgs production via heavy-quark loops in the SM and beyond
• XQCAT: eXtra Quark Combined Analysis Tool
• Non-standard top substructure
• Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Probing the top-Higgs boson FCNC couplings via the $h\to \gamma \gamma$ channel at the HE-LHC and FCC-hh
• Automated third generation squark production to next-to-leading order
• Illuminating New Electroweak States at Hadron Colliders
• A study of multi-jet production in association with an electroweak vector boson
• Probing Compositeness with the CMS $eejj$ & $eej$ Data
• Chargino and neutralino production at the Large Hadron Collider in left-right supersymmetric models
• Resolving Combinatorial Ambiguities in Dilepton $t\bar{t}$ Event Topologies with Constrained $M_2$ Variables
• Rare $Z$ Boson Decays to a Hidden Sector
• One Universal Extra Dimension in Pythia
• Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• T-Quarks at the Large Hadron Collider: 2010-12
• LHC constraints on M_1/2 and m_0 in the semi-constrained NMSSM
• Bigger, Better, Faster, More at the LHC
• Detecting a Boosted Diboson Resonance
• Monojets reveal overlapping excesses for light compressed higgsinos
• Understanding Single Tops using Jets
• LHC Discovery Potential for Non-Standard Higgs Bosons in the 3b Channel
• Establishing Jet Scaling Patterns with a Photon
• Energetic long-lived particles in the CMS muon chambers
• Search for baryon number violation in top-quark decays
• Light gravitino production in association with gluinos at the LHC
• Simplified Supersymmetry with Sneutrino LSP at 8 TeV LHC
• Travels on the squark-gluino mass plane
• Jet mass distribution in Higgs/vector boson + jet events at hadron colliders with $k_t$ clustering
• Looking for a vectorlike B quark at LHC using jet substructure
• Top B Physics at the LHC
• Dissecting Jets and Missing Energy Searches Using $n$-body Extended Simplified Models
• Azimuthal decorrelation between a jet and a Z boson at hadron colliders
• Stairway to discovery: a report on the CMS programme of cross section measurements from millibarns to femtobarns
• Seeking a coherent explanation of LHC excesses for compressed spectra
• Looking for leptogluons
• Study of Z bosons plus jets events using variables sensitive to double-parton scattering in pp collisions at 13 TeV
• Loop-induced $ZZ$ production at the LHC: an improved description by matrix-element matching
• Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at $\sqrt{s}=$ 13 TeV
• Signatures of top flavour-changing dark matter
• Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the $\mu \mu$bb and $\tau \tau$bb final states
• LHC constraints on electroweakino dark matter revisited
• Search for resonant production of second-generation sleptons with same-sign dimuon events in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measuring Supersymmetry with Heavy Scalars
• Characterising the 750 GeV diphoton excess
• Mu_x boosted-bottom-jet tagging and Z-prime boson searches
• Higgs and Z boson associated production via gluon fusion in the SM and the 2HDM
• Neutral Triple Vector Boson Production in Randall-Sundrum Model at the LHC
• Monojet Signatures from Heavy Colored Particles: Future Collider Sensitivities and Theoretical Uncertainties
• t-channel dark matter at the LHC -- a whitepaper
• Searches for violation of Lorentz invariance in top quark pair production using dilepton events in 13 TeV proton-proton collisions
• Measurement of differential cross sections for the production of a Z boson in association with jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Hidden Dipole Dark Matter
• A New Observable for Identifying Dijet Resonances
• Gluino Meets Flavored Naturalness
• Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Matching in $pp\to t\bar{t}W/Z/h+$ jet SMEFT studies
• LHC EFT WG Note: SMEFT predictions, event reweighting, and simulation
• Study on the azimuthal angle correlation between two jets in the top quark pair production
• Diquark contributions to Top quark charge asymmetry at the Tevatron and LHC
• Supersymmetry after the Higgs discovery and its LHC phenomenology
• A joint explanation for the soft lepton and monojet LHC excesses in the wino-bino model
• Higgs $p_t$ distribution in Higgs + jet production at hadron colliders within the noncommutative effective standard model
• Difference between two species of emu hides a test for lepton flavour violation
• Collider imprint of vector-like leptons in light of anomalous magnetic moment and neutrino data
• Supersymmetry - When Theory Inspires Experimental Searches
• Doubly resonant WW plus jet signatures at the LHC
• Improving smuon searches with Neural Networks
• Speeding up MadGraph5_aMC@NLO
• Implementation of full and simplified likelihoods in CheckMATE
• Searching for top-philic heavy resonances in boosted four-top final states
• Resummed jet mass distribution with trimming in Z+jet events at the LHC
• Vector-Like top quark production via a chromo-magnetic moment at the LHC
• Enhancing di-jet resonance searches via a final-state radiation jet tagging algorithm
• Deciphering compressed electroweakino excesses with MadAnalysis 5
• A simple merging algorithm for jet angular correlation studies
• Searching for Gluino LSP at the LHC