Automatic Generation of Tree Level Helicity Amplitudes

Abstract

The program MadGraph is presented which automatically generates postscript Feynman diagrams and Fortran code to calculate arbitrary tree level helicity amplitudes by calling HELAS[1] subroutines. The program is written in Fortran and is available in Unix and VMS versions. MadGraph currently includes standard model interactions of QCD and QFD, but is easily modified to include additional models such as supersymmetry.

Standard Latex file. 21 pages. 1 postscript figure appended after "\end{document}". Uses epsf.sty (available from hep-ph) to place figure. Can be TeXed without the figure if you don't have postscript. Harcopies or postscript file of entire paper available on request. MAD/PH/813

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• CP violating anomalous couplings in $W\gamma$ and $Z\gamma$ production at the LHC
• Z' signals in polarised top-antitop final states
• Search for Scalar Top Quark Production in p-pbar Collisions at sqrt(s)=1.96 TeV
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• Determination of the Spin of New Resonances in Electroweak Gauge Boson Pair Production at the LHC
• CP violation in sbottom decays
• The E6 inspired isosinglet quark and the Higgs boson
• Associated Production of Non-Standard Higgs Bosons at the LHC
• Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC
• A new method for extracting the bottom quark Yukawa coupling at the CERN Large Hadron Collider
• 'carlomat', A program for automatic computation of lowest order cross sections
• Probing neutrino mass with multilepton production at the Tevatron in the simplest R-parity violation model
• Feynman Rules for the Rational Part of One-loop QCD Corrections in the MSSM
• Unravelling the $WW\gamma$ and $WWZ$ Vertices at the Linear Collider: $\bar{\nu }\nu \gamma$ and $\bar{\nu }\nu \bar{q}q$ final states
• Recent Progress in the Golem Project
• Prospects to search for E6 isosinglet quarks in ATLAS
• Sqrt{shat}_{min} resurrected
• Probing Anomalous Quartic Couplings in e-gamma and gamma-gamma Colliders
• Associated production of the Higgs boson and a single top quark in the littlest Higgs model at Large Hadron Collier
• Spin correlations and new physics in $\tau$-lepton decays at the LHC
• Search for new physics in events with high jet multiplicity and low missing transverse momentum in proton-proton collisions at sqrt(s) = 8 TeV
• Polarized ZZ pairs in gluon fusion and vector boson fusion at the LHC
• Probing the light radion through diphotons at the Large Hadron Collider
• Tests of Anomalous Quartic Couplings at the NLC
• Single top quark photoproduction at the LHC
• Gluon Radiation in t\bar{t} Production at the Tevatron p\bar{p} Collider
• Non-exotic $Z^{\prime }$ signals in ${\ell }^{+}{\ell }^{-}$, $b\bar{b}$ and $t\bar{t}$ final states at the LHC
• Inverse type II seesaw mechanism and its signature at the LHC and ILC
• On Gluon Radiation in $t\bar{t}$ Production and Decay
• Discovering Colorons at the Early Stage LHC
• Doubly Charged Higgs Boson Production at Hadron Colliders II: A Zee-Babu Case Study
• H\to hh in the Mirror Model at the CERN Large Hadron Collider
• Electroweakino pair production at the LHC: NLO SUSY-QCD corrections and parton-shower effects
• Spin Polarisation of $t\bar{t}\gamma \gamma$ production at NLO+PS with GoSam interfaced to MadGraph5_aMC@NLO
• Next-to-leading order QCD corrections to photon production via weak-boson fusion
• NLO QCD corrections to diphoton plus jet production through graviton exchange
• Detecting a Higgs Pseudoscalar with a $Z$ Boson at the LHC
• Inelastic Photoproduction at HERA: a Second Charmonium Crisis?
• A Two-Tiered Correlation of Dark Matter with Missing Transverse Energy: Reconstructing the Lightest Supersymmetric Particle Mass at the LHC
• Anomalous Higgs Boson Contribution to e^+ e^- \to b \bbar γat LEP2
• Towards model-independent exclusion of light Stops
• A Precise Measurement of the Tau Lifetime
• Detecting a Higgs Pseudoscalar with a Z Boson Produced in Bottom Quark Fusion
• Robust LHC Higgs Search in Weak Boson Fusion
• Hidden Extra U(1) at the Electroweak/TeV Scale
• Four-fermion production at gamma gamma colliders: 1. Lowest-order predictions and anomalous couplings
• 'carlomat', version 2 of the program for automatic computation of lowest order cross sections
• PHASE, a Monte Carlo event generator for six-fermion physics at the LHC
• Down Type Isosinglet Quarks in ATLAS
• Discovering the Higgs Bosons of Minimal Supersymmetry with Tau Leptons and a Bottom Quark
• Associated W and Higgs boson photoproduction and other electroweak photon induced processes at the LHC
• Properties of the Top Quark
• Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
• Beyond the Higgs boson at the Tevatron: detecting gluinos from Yukawa-unified SUSY
• Boosted Top Quarks and Jet Structure
• Present Bounds on New Neutral Vector Resonances from Electroweak Gauge Boson Pair Production at the LHC
• Top-quark couplings to TeV resonances at future lepton colliders
• Searching the Inclusive Lepton + Photon + Missing ET + b-quark Signature for Radiative Top Quark Decay and Non-Standard-Model Processes
• New developments in FeynRules
• Observation of Single Top Quark Production
• Testing Grand Unification at the (S)LHC
• Multiple Z' -> t-tbar signals in a 4D Composite Higgs Model
• Top quark pair + jet production at next-to-leading order: NLO QCD corrections to gg -> t tbar g
• Calculation of Z Plus Four Jet Production at the Tevatron
• Associated production of light gravitinos in e^+e^- and e^-γcollisions
• Heavy-quark production at large rapidities at hadron colliders
• Next-To-Leading Order QCD Corrections to Associated Production of a SM Higgs Boson with a Pair of Weak Bosons in the POWHEG-BOX
• Top-quark pair + 1-jet production at next-to-leading order QCD
• Detection of heavy charged Higgs bosons in $e^{+}{e}^{-}\to t\bar{b}{H}^{-}$ production at future Linear Colliders
• Diffractive W + 2 jet production: a background to exclusive H \to WW production at hadron colliders
• Testing Non commutative QED gamma-gamma-gamma and gamma-gamma-gamma-gamma Couplings at LHC
• Method 2 at NLO
• Tevatron Potential for Technicolor Search with Prompt Photons
• Tagging Sneutrino Resonances at a Linear Collider with Associated Photons
• Leptonic final states from di-boson production at the LHC in the 4-Dimensional Composite Higgs Model
• Search for New Physics in Lepton + Photon + X Events with L=305 pb-1 of ppbar Collisions at roots=1.96 TeV
• Squark Mixing in Electron-Positron Reactions
• Detecting Fourth Generation Quarks at Hadron Colliders
• Radion and Higgs Signals in Peripheral Heavy Ion Collisions at the LHC
• Probing the Radion-Higgs mixing at hadronic colliders
• Gluon Radiation in $t\bar{t}$ Production and Decay at the LHC
• Direct Signals for Large Extra Dimensions in the Production of Fermion Pairs at Linear Colliders
• Adding Pseudo-Observables to the Four-Lepton Experimentalist's Toolbox
• Signatures of the Light Down-Squark Scenario at the Upgraded Tevatron
• Dynamical R-parity Breaking at the LHC
• Tau lepton charge asymmetry and new physics at the LHC
• Using Tau Polarization to Sharpen up the SUGRA Signal at Tevatron
• NLO QCD corrections to the production of off--shell WW pairs at $e^{+}{e}^{-}$ colliders
• Correlated Event Excesses in LHC SUSY Searches at 7 & 8 TeV: New Physics or Conspiring Noise?
• The Associated Production of Weak Bosons and Jets by Multiple Parton Interactions
• Factorizable electroweak O(alpha) corrections for top quark pair production and decay at a linear e+e- collider
• Slepton pair production in association with a jet: NLO-QCD corrections and parton-shower effects
• Intermediate mass standard model Higgs boson at the proposed CERN LEP$\otimes$LHC $ep$ collider
• Top quark phenomenology of the ADD model and the Minimal Length Scenario
• ee4fgamma, A program for e+e- -> 4f, 4fgamma with nonzero fermion masses
• On Forward J/ψProduction at Fermilab Tevatron
• FeynGrav 3.0
• Discovering the Higgs Bosons of Minimal Supersymmetry with Bottom Quarks
• Same Sign WW Scattering Process as a Probe of Higgs Boson in pp Collision at $\sqrt{s}$ = 10 TeV
• Probing Trilinear Gauge Boson Interactions via Single Electroweak Gauge Boson Production at the LHC
• Slepton Oscillation at e-gamma Colliders
• Single sneutrino production at hadron colliders
• Three photon production to NLO+PS accuracy at the LHC
• Angular Correlations and Light Gluinos in Multi-jet Photoproduction at HERA
• Probing Higgs Couplings in e^+ e^- \to γγγ
• Generating QCD amplitudes in the color-flow basis with MadGraph
• Increased Yield of ttbb at Hadron Colliders in Low-Energy Supersymmetry
• The $\tau$-polarisation test for the $H/A\to {\tau }^{+}{\tau }^{-}$ signal at the LHC
• Discovering the Origin of Yukawa Couplings at the LHC with a Singlet Higgs and Vector-like Quarks
• Discovery and Mass Spectroscopy via Mixed Di-Boson Production at the LHC in a 4-Site Model with a Composite Higgs Boson
• Event generator for the LHC
• Anomalous Couplings in e^+ e^- --> W^+ W^- gamma at LEP2 and NLC
• Observing Higgs Dark Matter at the CERN LHC
• QCD at high energy
• Effective squark/chargino/neutralino couplings: MadGraph implementation
• Prospects for Higgs Searches with the Tri-bottom Channel in Unified SUSY Models
• A simple algorithm for automatic Feynman diagram generation
• Top quark pair production and decay at linear colliders: signal vs. off resonance background
• Automatic one-loop calculation of MSSM processes with GRACE
• Uncovering quasi-degenerate Kaluza-Klein Electro-Weak gauge bosons with top asymmetries at the LHC
• QCD Loop Corrections to Top Production and Decay at e^+ e^- Colliders
• Dark matter pair production in the MSSM and in simplified dark matter models at the LHC
• T-odd anomalous interactions of the top-quark at the Large Hadron Collider
• Functional Directed Acyclical Graphs for Scattering Amplitudes in Perturbation Theory
• Searching for long-lived dark scalars at the FCC-ee
• Precision tools for the simulation of double-Higgs production via vector-boson fusion
• Sum rules for $e^{+}{e}^{-}\to W^{+}{W}^{-}$ helicity amplitudes from BRS invariance
• Super AutoDipole
• Light Fermion Mass Effects in e^+e^- -> 4 Fermions
• Quaero@H1: An Interface to High-pT HERA Event Data
• Probing the radion-Higgs mixing at photon colliders
• Intermediate mass Higgs bosons of the Minimal Supersymmetric Standard Model at the proposed CERN LEP$\otimes$LHC $ep$ collider
• Mixed top-bottom squark production at the LHC
• A study of single sneutrino production in association with fermion pairs at polarised photon colliders
• Testing Color Evaporation in Photon-Photon Production of J/Psi at CERN LEP II
• Longitudinal parity-violating asymmetry in hadronic decays of weak bosons in polarized proton collisions
• The 750 GeV threshold to a new particle world
• Next-to-leading-order QCD corrections and parton-shower effects for weakino+squark production at the LHC
• QCD: Theoretical Developments
• Soft Color Enhancement of the Production of J/psi's by Neutrinos
• Fourth-Generation Leptons at LEP2
• Probing Near-Conformal Technicolor through Weak Boson Scattering
• The contribution of the four-parton final states to gamma* gamma* -> hadrons
• Top-quark forward-backward asymmetry from a color-octet t-channel resonance
• New Higgs Interactions in ZZγand ZγγProduction
• Light $Z^{\prime }$ Signatures at the LHC
• Physics Potential of a Tevatron Tripler
• Next-to-leading order QCD corrections for single top-quark production in association with two jets
• Constricted SUSY from No-Scale F-SU(5): A "Blind Spot" for LHC Top Quark Reconstruction?
• The role of charge and spin asymmetries in profiling Z'-> tt events
• Hunting a Light U(1)_B Gauge Boson Coupled to Baryon Number in Collider Experiments
• Associated production of Z boson and a pair of new quarks at the LHC
• QCD at hadron colliders
• Prospects of Squark & Slepton searches at a Gamma Gamma Collider
• The production of gauge bosons pairs $W^{+}{W}^{-}$ associated with 0, 1 and 2 jets in proton-proton collisions at LHC
• Heavy Higgs production and decay via $e^{+}{e}^{-}\to Z^0{H}^0\to b\bar{b}{Z}^0{Z}^0$ and irreducible backgrounds at Next Linear Colliders
• CP violating Z t anti-t and gamma t anti-t Couplings at a Future e+ e- Collider
• Weak Boson Production Amplitude Zeros; Equalities of the Helicity Amplitudes
• The dual gauge fixing property of the S matrix
• Automated computation of scattering amplitudes
• Top pair production with an extra gluon at the Tevatron
• Hard processes in multi-TeV ion collisions
• QCD corrections to single top quark production in electron photon interactions
• Monte Carlo Event Generators
• Standard Model Higgs boson production and hard photon radiation in $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}b\bar{b}\gamma$ events at LEP II and Next Linear Collider
• Finite width and irreducible background effects to $t\bar{t}$ production at $\gamma \gamma$ Next Linear Colliders
• Discovery Limits for Techni-Omega Production in $e\gamma$ Collisions
• New Signatures For Top In Hadron Collider
• Higgs signals and hard photons via $WW$-fusion in the Standard Model at the Next Linear Collider
• Probing new physics with tau-leptons at the LHC
• Searches for New Physics in Photon Final States
• GoSam applications for automated NLO calculations
• Monte Carlo Event Generators for Future Lepton Colliders
• Weak bosons as partons below 10 TeV partonic center-of-momentum
• Top-antitop pair production via $b$-quark initiated processes at the Large Hadron Collider
• Production of gauge bosons plus jets in hadronic collisions
• Triple Gauge Boson Production and Dynamical Symmetry Breaking at the Next Linear Collider
• Current status of CARLOMAT, a program for automatic computation of lowest order cross sections
• NLO QCD corrections to pp -> ttbb+X via quark anti-quark annihilation
• Prospects for Higgs search at the LHC
• Six-fermion production at e+e- colliders