Supersymmetry Simulations with Off-Shell Effects for LHC and ILC

Abstract

At the LHC and at an ILC, serious studies of new physics benefit from a proper simulation of signals and backgrounds. Using supersymmetric sbottom pair production as an example, we show how multi-particle final states are necessary to properly describe off-shell effects induced by QCD, photon radiation, or by intermediate on-shell states. To ensure the correctness of our findings we compare in detail the implementation of the supersymmetric Lagrangian in MadGraph, Sherpa and Whizard. As a future reference we give the numerical results for several hundred cross sections for the production of supersymmetric particles, checked with all three codes.

56 p., 14 embedded figs., accepted for publication in PRD

References in corpus (112)

• Particle Dark Matter: Evidence, Candidates and Constraints
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Supersymmetric Dark Matter
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• A complete analysis of FCNC and CP constraints in general SUSY extensions of the standard model
• QCD Matrix Elements + Parton Showers
• SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+ e- colliders
• MadEvent: Automatic Event Generation with MadGraph
• Measurement of the Negative Muon Anomalous Magnetic Moment to 0.7 ppm
• SuSpect: a Fortran Code for the Supersymmetric and Higgs Particle Spectrum in the MSSM
• SOFTSUSY: a program for calculating supersymmetric spectra
• Automatic Generation of Tree Level Helicity Amplitudes
• SUSY Les Houches Accord: Interfacing SUSY Spectrum Calculators, Decay Packages, and Event Generators
• CompHEP 4.4 - Automatic Computations from Lagrangians to Events
• ANALYTICAL EXPRESSIONS FOR RADIATIVELY CORRECTED HIGGS MASSES AND COUPLINGS IN THE MSSM
• More Model-Independent Analysis of b->s Processes
• Leptoproduction of Heavy Quarks II -- A Unified QCD Formulation of Charged and Neutral Current Processes from Fixed-target to Collider Energies
• Stop Production at Hadron Colliders
• Squark and Gluino Production at Hadron Colliders
• The Muon Anomalous Magnetic Moment: A Harbinger For "New Physics"
• Branching Fraction and Photon Energy Spectrum b -> s gamma
• The Production of Charginos/Neutralinos and Sleptons at Hadron Colliders
• Physics Interplay of the LHC and the ILC
• Predictions for all processes e^+e^- -> 4 fermions + gamma
• SHERPA 1.alpha, a proof-of-concept version
• Higgs boson production in bottom quark fusion at next-to-next-to-leading order
• Pair Production of Neutral Higgs Particles in Gluon--Gluon Collisions
• SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
• AMEGIC++ 1.0, A Matrix Element Generator In C++
• Updated Estimate of the Muon Magnetic Moment Using Revised Results from e+e- Annihilation
• Hard-scattering factorization with heavy quarks: A general treatment
• Complete set of Feynman rules for the MSSM -- ERRATUM
• Matrix Elements and Parton Showers in Hadronic Interactions
• Analysis of Neutral Higgs-Boson Contributions to the Decays B_s -> l^+l^- and B -> K l^+l^-
• 2HDMs predictions for $B\to X_s\gamma$ in NLO QCD
• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Higgs Radiation off Bottom Quarks at the Tevatron and the LHC
• Extracting Higgs boson couplings from LHC data
• Observing an invisible Higgs boson
• Reanalysis of Hadronic Cross Section Measurements at CMD-2
• Exclusive Higgs Boson Production with bottom quarks at Hadron Colliders
• O'Mega: An Optimizing Matrix Element Generator
• Electroweak radiative corrections to e+e- --> WW --> 4fermions in double-pole approximation -- the RACOONWW approach
• Measurement of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma )$ and extraction of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-})$ below 1 {\rm GeV} with the KLOE detector
• Relations between ΔM_{s,d} and B_{s,d}\to μ\barμin Models with Minimal Flavour Violation
• Weight optimization in multichannel Monte Carlo
• Electroweak and supersymmetric two-loop corrections to (g-2)_μ
• Measurements of Masses in SUGRA Models at LHC
• HELAC: a package to compute electroweak helicity amplitudes
• Treatment of Heavy Quarks in Deeply Inelastic Scattering
• Measuring sparticle masses in non-universal string inspired models at the LHC
• Charged Higgs Boson Production in Bottom-Gluon Fusion
• Predictions for g-2 of the muon and alpha_QED(M_Z^2)
• Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider
• Searching for supersymmetry in rare B decays
• Higgs-Boson Production in Association with a Single Bottom Quark
• Regularization by Dimensional Reduction: Consistency, Quantum Action Principle, and Supersymmetry
• High-Precision Predictions for the MSSM Higgs Sector at O(alpha_b alpha_s)
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• $K_L\to {\pi }^0{e}^{+}{e}^{-}$ and $B\to X_s{\ell }^{+}{\ell }^{-}$ Decay in the MSSM
• Vegas Revisited: Adaptive Monte Carlo Integration Beyond Factorization
• Associated Production of a Top Quark and a Charged Higgs Boson
• A method for identifying H -> tau tau -> e mu pTmiss at the CERN LHC
• Measuring slepton spin at the LHC
• Measurement of SUSY masses via cascade decays for SPS 1a
• Stable Calculations for Unstable Particles: Restoring Gauge Invariance
• Spin Correlations in Monte Carlo Simulations
• Three Loop Top Quark Contributions to the rho Parameter
• The Quartic Higgs Coupling at Hadron Colliders
• Interactions of Heavy Stable Hadronizing Particles
• Addendum to: 2HDMs predictions for $B\to X_s\gamma$ in NLO QCD
• Measurement of the Gluino Mass via Cascade Decays for SPS 1a
• Finite Width Effects and Gauge Invariance in Radiative $W$ Production and Decay
• Renormalization of the Minimal Supersymmetric Standard Model
• The fermion-loop scheme for finite-width effects in e^+ e^- annihilation into four fermions
• Squark and Gluino Production with Jets
• Split Supersymmetry at Colliders
• Stopping Gluinos
• LUSIFER: a LUcid approach to SIx-FERmion production
• Higgs-Boson Production Induced by Bottom Quarks
• Production of Charged Higgs Boson Pairs in Gluon-Gluon Collisions
• Search for Bs->mu+mu- and Bd->mu+mu- Decays in ppbar Collisions at sqrt(s)=1.96 TeV
• Implementing the ME+PS merging algorithm
• A Search for the Flavor-Changing Neutral Current Decay B0_s -> mu^+mu^- in pp(bar) Collisions at \sqrt{s} = 1.96 TeV with the D0 Detector
• Three-Loop Electroweak Correction to the Rho Parameter in the Large Higgs Mass Limit
• Probing the MSSM Higgs Sector via Weak Boson Fusion at the LHC
• CIRCE Version 1.0: Beam Spectra for Linear Collider Physics
• Simulating W/Z+jets production at the Tevatron
• Super-conservative interpretation of muon g-2 results applied to supersymmetry
• Inclusive production of a Higgs or Z boson in association with heavy quarks
• Dyson summation without violating Ward identities and the Goldstone-boson equivalence theorem
• Cross sections for multi-particle final states at a linear collider
• Improved description of charged Higgs boson production at hadron colliders
• Theoretical precision in estimates of the hadronic contributions to (g-2)_mu and alpha_QED(M_Z)
• Charged Higgs Boson Pairs at the LHC
• Detecting Exotic Heavy Leptons at the Large Hadron Collider
• Determination of the Branching Fraction for Inclusive Decays B -> X_{s} gamma
• One-loop calculations for SUSY processes
• Generic User Process Interface for Event Generators
• Unstable Particles and Non-Conserved Currents: a Generalization of the Fermion-Loop Scheme
• Renormalization of supersymmetric Yang-Mills theories with soft supersymmetry breaking
• Full one-loop corrections to neutralino pair production in e+e- annihilation
• Studying W+W- production at the Fermilab Tevatron with SHERPA
• Investigation of the Discovery Potential for Higgs Bosons of the Minimal Supersymmetric Extension of the Standard Model (MSSM) with ATLAS
• Minimal Gauge Invariant Classes of Tree Diagrams in Gauge Theories
• NEXTCALIBUR - A four-fermion generator for electron-positron collisions
• An effective Lagrangian approach for unstable particles
• Clockwork SUSY: Supersymmetric Ward and Slavnov-Taylor Identities At Work in Green's Functions and Scattering Amplitudes
• Complete Lagrangian of MSSM
• Production of Supersymmetric Particles at High-Energy Colliders
• Gauge checks, consistency of approximation schemes and numerical evaluation of realistic scattering amplitudes

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• Probing SUSY CP Violation in Two-Body Stop Decays at the LHC
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• CP asymmetries with Longitudinal and Transverse Beam Polarizations in Neutralino Production and Decay into the Z^0 Boson at the ILC
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• Distorted mass edges at LHC from supersymmetric leptoquarks
• Testing the CP-violating MSSM in stau decays at the LHC and ILC
• CP asymmetries in the supersymmetric trilepton signal at the LHC
• The NMSSM implementation in WHIZARD
• CP-sensitive spin-spin correlations in neutralino production at the ILC
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• Super AutoDipole
• Monte Carlo Event Generators