Missing Momentum Reconstruction and Spin Measurements at Hadron Colliders

Abstract

We study methods for reconstructing the momenta of invisible particles in cascade decay chains at hadron colliders. We focus on scenarios, such as SUSY and UED, in which new physics particles are pair produced. Their subsequent decays lead to two decay chains ending with neutral stable particles escaping detection. Assuming that the masses of the decaying particles are already measured, we obtain the momenta by imposing the mass-shell constraints. Using this information, we develop techniques of determining spins of particles in theories beyond the standard model. Unlike the methods relying on Lorentz invariant variables, this method can be used to determine the spin of the particle which initiates the decay chain. We present two complementary ways of applying our method by using more inclusive variables relying on kinematic information from one decay chain, as well as constructing correlation variables based on the kinematics of both decay chains in the same event.

Version to appear in JHEP

References in corpus (31)

• Herwig++ Physics and Manual
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• TeV Symmetry and the Little Hierarchy Problem
• Little Hierarchy, Little Higgses, and a Little Symmetry
• Top quark pair production and decay at hadron colliders
• Warped Unification, Proton Stability and Dark Matter
• Baryon Number in Warped GUTs : Model Building and (Dark Matter Related) Phenomenology
• Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider
• Top pair invariant mass distribution: a window on new physics
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• Measuring slepton spin at the LHC
• Mass Determination in SUSY-like Events with Missing Energy
• Spin Correlation in Top-Quark Production at Hadron Colliders
• Accurate Mass Determinations in Decay Chains with Missing Energy
• A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
• Spin Measurements in Cascade Decays at the LHC
• Distinguishing Spins in Decay Chains at the Large Hadron Collider
• Six-Dimensional Gauge Theory on the Chiral Square
• Spinless photon dark matter from two universal extra dimensions
• Top-antitop and Top-top Resonances in the Dilepton Channel at the CERN LHC
• A General Method for Model-Independent Measurements of Particle Spins, Couplings and Mixing Angles in Cascade Decays with Missing Energy at Hadron Colliders
• A Review of Spin Determination at the LHC
• Search for Supersymmetry with Gauge-Mediated Breaking in Diphoton Events with Missing Transverse Energy at CDF II
• Spin Correlations in Decay Chains Involving W Bosons
• Search for Supersymmetry in Di-Photon Final States at sqrt{s} = 1.96 TeV
• On the Existence of Angular Correlations in Decays with Heavy Matter Partners
• Testing Gluino Spin with Three-Body Decays
• Probing CP Violation with and without Momentum Reconstruction at the LHC
• Reconstructing particle masses from pairs of decay chains
• Distinguishing spins in decay chains with photons at the Large Hadron Collider
• Study of chargino-neutralino production at hadron colliders in a long-lived slepton scenario

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• Exploring properties of long-lived particles in inelastic dark matter models at Belle II
• Early spin determination at the LHC?
• Polynomials, Riemann surfaces, and reconstructing missing-energy events
• Spin effects in the antler event topology at hadron colliders
• Distinguishing spins at the LHC using bound state signals
• Improved mass measurement using the boundary of many-body phase space
• Detecting kinematic boundary surfaces in phase space: particle mass measurements in SUSY-like events
• Identifying Phase Space Boundaries with Voronoi Tessellations
• Measuring Invisible Particle Masses Using a Single Short Decay Chain
• Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC
• Spin before mass at the LHC
• Multi-Dimensional Phase Space Methods for Mass Measurements and Decay Topology Determination
• Spin and Chirality Effects in Antler-Topology Processes at High Energy $e^{+}{e}^{-}$ Colliders
• Applying Machine Learning Techniques To Intermediate-Length Cascade Decays