Model Discrimination at the LHC: a Case Study

Abstract

We investigate the potential of the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) to discriminate between two theoretical models predicting anomalous events with jets and large missing transverse energy, minimal supersymmetry and Little Higgs with T Parity. We focus on a simple test case scenario, in which the only exotic particles produced at the LHC are heavy color-triplet states (squarks or T-quarks), and the only open decay channel for these particles is into the stable missing-energy particle (neutralino or heavy photon) plus a quark. We find that in this scenario, the angular and momentum distributions of the observed jets are sufficient to discriminate between the two models with a few inverse fb of the LHC data, provided that these distributions for both models and the dominant Standard Model backgrounds can be reliably predicted by Monte Carlo simulations.

19 pages, 6 figures. v3: included calibration procedure of PGS to CMS detector and an estimate of new physics discovery significance levels

References in corpus (27)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• High-Energy-Physics Event Generation with PYTHIA 6.1
• A Supersymmetry Primer
• MadEvent: Automatic Event Generation with MadGraph
• TeV Symmetry and the Little Hierarchy Problem
• Phenomenology of the Little Higgs Model
• Little Higgs Models and Their Phenomenology
• Phenomenology of the Littlest Higgs with T-Parity
• T Parity and the Littlest Higgs
• Top Quarks and Electroweak Symmetry Breaking in Little Higgs Models
• Electroweak Precision Constraints on the Littlest Higgs Model with T Parity
• Discrimination of Supersymmetry and Universal Extra Dimensions at Hadron Colliders
• Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• Measuring slepton spin at the LHC
• Top Partners at the LHC: Spin and Mass Measurement
• Spin Measurements in Cascade Decays at the LHC
• Distinguishing Spins in Decay Chains at the Large Hadron Collider
• It's a Gluino!
• A General Method for Model-Independent Measurements of Particle Spins, Couplings and Mixing Angles in Cascade Decays with Missing Energy at Hadron Colliders
• Missing energy look-alikes with 100 pb-1 at the LHC
• A Review of Spin Determination at the LHC
• Collider Signature of T-quarks
• New Developments in MadGraph/MadEvent
• Testing Gluino Spin with Three-Body Decays
• On the Existence of Angular Correlations in Decays with Heavy Matter Partners

Cited by in corpus (11)

• Higgs look-alikes at the LHC
• From the LHC to Future Colliders
• Precise reconstruction of sparticle masses without ambiguities
• Shedding Light on the Dark Sector with Direct WIMP Production
• Identifying Dark Matter Event Topologies at the LHC
• Early spin determination at the LHC?
• T-Quarks at the Large Hadron Collider: 2010-12
• Beyond the Standard Model
• Two jets and missing $E_T$ signature to determine the spins of the new particles
• Dreaming Awake: Disentangling the Underlying Physics in Case of a SUSY-like Discovery at the LHC
• Odd Decays from Even Anomalies: Gauge Mediation Signatures Without SUSY