Automated Predictions from Polarized Matrix Elements

Abstract

The anticipated experimental resolution and data cache of the High Luminosity Large Hadron Collider will enable precision investigations of polarization in multiboson processes. This includes, for the first time, vector boson scattering. To facilitate such studies, we report the automation of polarized matrix element computations in the publicly available Monte Carlo tool suite, MadGraph5_aMC@NLO. This enables scattering and decay simulations involving helicity-polarized asymptotic or intermediate states, preserving both spin-correlation and off-shell effects. As demonstrations of the method, we investigate the leading order production and decay of polarized weak gauge bosons in the process $pp\to jj{W}_{\lambda }^{+}{W}_{{\lambda }^{\prime }}^{-}$, with helicity eigenstates $(\lambda ,{\lambda }^{\prime })$ defined in various reference frames. We consider the Standard Model at both $\mathcal{O}({\alpha }^4)$ and $\mathcal{O}({\alpha }^2{\alpha }_s^2)$ as well as a benchmark composite Higgs scenario. We report good agreement with polarization studies based on the On-Shell Projection (OSP) technique. Future capabilities are discussed.

arXiv comment47 pages, 10 figures (36 pdf files). Published in the JHEP

References in corpus (57)

• A Large Mass Hierarchy from a Small Extra Dimension
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The Hierarchy Problem and New Dimensions at a Millimeter
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• MadGraph 5 : Going Beyond
• Phenomenology, Astrophysics and Cosmology of Theories with Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
• LHAPDF6: parton density access in the LHC precision era
• The Minimal Composite Higgs Model
• UFO - The Universal FeynRules Output
• Bounds on Universal Extra Dimensions
• FeynRules - Feynman rules made easy
• MadEvent: Automatic Event Generation with MadGraph
• Automatic Generation of Tree Level Helicity Amplitudes
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• Higgs as a Holographic Pseudo-Goldstone Boson
• A custodial symmetry for Zbb
• Parton distributions with QED corrections
• Light custodians in natural composite Higgs models
• A standard format for Les Houches Event Files
• Automation of next-to-leading order computations in QCD: the FKS subtraction
• Composite Higgses
• W+W-, WZ and ZZ production in the POWHEG BOX
• The automation of next-to-leading order electroweak calculations
• Sudakov Factorization and Resummation
• A framework for Higgs characterisation
• Electroweak radiative corrections to e+e- --> WW --> 4fermions in double-pole approximation -- the RACOONWW approach
• Illuminating the photon content of the proton within a global PDF analysis
• Disentangling a dynamical Higgs
• Color-flow decomposition of QCD amplitudes
• ALOHA: Automatic Libraries Of Helicity Amplitudes for Feynman diagram computations
• Factorization and NNLL Resummation for Higgs Production with a Jet Veto
• Spin Correlations in Monte Carlo Simulations
• Unstable particles in One Loop Calculations
• Electroweak Splitting Functions and High Energy Showering
• On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy
• PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders
• Electroweak gauge boson polarisation at the LHC
• Precise predictions for same-sign W-boson scattering at the LHC
• Standard Model Parton Distributions at Very High Energies
• $\order(Γ)$ Corrections to $W$ pair production in $e^{+}{e}^{-}$ and $\gamma \gamma$ collisions
• Electroweak Higgs plus Three Jet Production at NLO QCD
• Color matrix element corrections for parton showers
• Simulating spin-3/2 particles at colliders
• Electroweak Evolution Equations
• $W$ boson polarization in vector boson scattering at the LHC
• Electroweak Logarithms in Inclusive Cross Sections
• Polarized vector boson scattering in the fully leptonic WZ and ZZ channels at the LHC
• Studies of Dimension-Six EFT effects in Vector Boson Scattering
• Isolating Vector Boson Scattering at the LHC: gauge cancellations and the Equivalent Vector Boson Approximation vs complete calculations
• Parton Shower and Matching Uncertainties in Top Quark Pair Production with Herwig 7
• Fiducial polarization observables in hadronic WZ production: A next-to-leading order QCD+EW study
• Polarization observables in WZ production at the 13 TeV LHC: Inclusive case
• Colour Reconnection from Soft Gluon Evolution
• Single top polarisation as a window to new physics
• Vector Boson scattering at the LHC: counting experiments for unitarized models in a full six fermion approach
• What Does the CMS Measurement of W-polarization Tell Us about the Underlying Theory of the Coupling of W-Bosons to Matter?
• Anomalous Sudakov Form Factors

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• $SU(2{)}_L$ triplet scalar as the origin of the 95 GeV excess?
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• Majorana Neutrinos in Same-Sign $W^{\pm }{W}^{\pm }$ Scattering at the LHC: Breaking the TeV Barrier
• Different polarization definitions in same-sign $WW$ scattering at the LHC
• Vector Boson Scattering Processes: Status and Prospects
• NNLO QCD study of polarised $W^{+}{W}^{-}$ production at the LHC
• Vector boson polarizations in the decay of the Standard Model Higgs
• From angular coefficients to quantum observables: a phenomenological appraisal in di-boson systems
• A quantitative study on helicity inversion in Majorana neutrino decays at the LHC
• NLO QCD corrections to polarised di-boson production in semi-leptonic final states
• Single top production in association with a $WZ$ pair at the LHC in the SMEFT
• Observation of gauge boson joint-polarisation states in $W^{\pm }Z$ production from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Polarized Z bosons from the decay of a Higgs boson produced in association with two jets at the LHC
• Target mass corrections in lepton--nucleus DIS: theory and applications to nuclear PDFs
• Measurement of Higgs boson self-couplings through $2\to 3$ vector bosons scattering in future muon colliders
• Polarized ZZ pairs in gluon fusion and vector boson fusion at the LHC
• Evidence of pair production of longitudinally polarised vector bosons and study of CP properties in $ZZ\to 4\ell$ events with the ATLAS detector at $\sqrt{s}=13$ TeV
• Doubly Charged Higgs Boson Production at Hadron Colliders II: A Zee-Babu Case Study
• Amplitude-assisted tagging of longitudinally polarised bosons using wide neural networks
• Polarization measurement for the dileptonic channel of $W^{+}{W}^{-}$ scattering using generative adversarial network
• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
• Prospects for measuring quark polarization and spin correlations in $b\bar{b}$ and $c\bar{c}$ samples at the LHC
• Polarized-boson pairs at NLO in the SMEFT
• Detecting anomaly in vector boson scattering
• Studies of the energy dependence of diboson polarization fractions and the Radiation Amplitude Zero effect in WZ production with the ATLAS detector
• Longitudinally polarized ZZ scattering at the Muon Collider
• $CP$ violation in the $HZZ$ vertex and left-right asymmetries
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• NLO EW and QCD corrections to polarized ZZ production in the four-charged-lepton channel at the LHC
• Sensitivity to longitudinal vector boson scattering and doubly-charged Higgs boson production in ${\mathbf{W}}^{\pm }{\mathbf{W}}^{\pm }\mathbf{jj}$ at future hadron colliders
• $CP$-odd form factor in the $HWW$ vertex
• Sensitivity to longitudinal vector boson scattering in semileptonic final states at the HL-LHC
• Weak bosons as partons below 10 TeV partonic center-of-momentum