Improving SUSY Spectrum Determinations at the LHC with Wedgebox Technique

Abstract

The LHC has the potential not only to discover supersymmetry (SUSY), but also to permit fairly precise measurements of at least a portion of the sparticle spectrum. Proposed mass reconstruction methods rely upon either inverting invariant mass endpoint expressions or upon solving systems of mass-shell equations. These methodologies suffer from the weakness that one certain specific sparticle decay chain is assumed to account for all the events in the sample. Taking two examples of techniques utilizing mass-shell equations, it is found that also applying the wedgebox technique allows for the isolation of a purer event sample, thus avoiding errors, possibly catastrophic, due to mistaken assumptions about the decay chains involved and simultaneously improving accuracy. What is innovative is using endpoint measurements (via the wedgebox technique) to obtain a more homogeneous, well-understood sample set rather than just using said endpoints to constrain the values of the masses (here found by the mass-shell technique). The fusion of different established techniques in this manner represents a highly profitable option for LHC experimentalists who will soon have data to analyze.

Final version published in JHEP with some minor typo corrected

References in corpus (28)

• PYTHIA 6.4 Physics and Manual
• Supersymmetry, Naturalness, and Signatures at the LHC
• Gluino Stransverse Mass
• Measuring superparticle masses at hadron collider using the transverse mass kink
• On measuring the masses of pair-produced semi-invisibly decaying particles at hadron colliders
• Weighing Wimps with Kinks at Colliders: Invisible Particle Mass Measurements from Endpoints
• Mass Determination in SUSY-like Events with Missing Energy
• Accurate Mass Determinations in Decay Chains with Missing Energy
• MTGEN : Mass scale measurements in pair-production at colliders
• Transverse Observables and Mass Determination at Hadron Colliders
• Reconstructing Sparticle Mass Spectra using Hadronic Decays
• Mass Determination of New States at Hadron Colliders
• Inclusive transverse mass analysis for squark and gluino mass determination
• A short comparison between m_T2 and m_CT
• A hybrid method for determining particle masses at the Large Hadron Collider with fully identified cascade decays
• Constrained invariant mass distributions in cascade decays. The shape of the "$m_{qll}$-threshold" and similar distributions
• Heavy-flavour tagging and the supersymmetry reach of the CERN Large Hadron Collider
• Three body kinematic endpoints in SUSY models with non-universal Higgs masses
• Mass Determination in Cascade Decays Using Shape Formulas
• Identifying Dark Matter Event Topologies at the LHC
• Supersymmetry in Elementary Particle Physics
• A Simple Mass Reconstruction Technique for SUSY particles at the LHC
• Hidden Thresholds: A Technique for Reconstructing New Physics Masses at Hadron Colliders
• Wedgebox analysis of four-lepton events from neutralino pair production at the LHC
• Squark Cascade Decays to Charginos/Neutralinos: Gluon Radiation
• Extracting MSSM Masses From Heavy Higgs Decays to Four Leptons at the LHC
• Neutralino Reconstruction at the LHC from Decay-frame Kinematics
• Mass Estimation without using MET in early LHC data

Cited by in corpus (11)

• Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
• Dark Matter Particle Spectroscopy at the LHC: Generalizing MT2 to Asymmetric Event Topologies
• Using kinematic boundary lines for particle mass measurements and disambiguation in SUSY-like events with missing energy
• Precise reconstruction of sparticle masses without ambiguities
• Supersymmetric particle mass measurement with invariant mass correlations
• Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
• Reconstructing the heavy resonance at hadron colliders
• On Measuring Split-SUSY Neutralino and Chargino Masses at the LHC
• A Simple Mass Reconstruction Technique for SUSY particles at the LHC
• Determination of supersymmetric masses using kinematic fits at the LHC
• ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Equivariant Quantum Neural Networks: Benchmarking against Classical Neural Networks