Invariant mass distributions in cascade decays

Abstract

We derive analytical expressions for the shape of the invariant mass distributions of massless Standard Model endproducts in cascade decays involving massive New Physics (NP) particles, D -> Cc -> Bbc -> Aabc, where the final NP particle A in the cascade is unobserved and where two of the particles a, b, c may be indistinguishable. Knowledge of these expressions can improve the determination of NP parameters at the LHC. The shape formulas are composite, but contain nothing more complicated than logarithms of simple expressions. We study the effects of cuts, final state radiation and detector effects on the distributions through Monte Carlo simulations, using a supersymmetric model as an example. We also consider how one can deal with the width of NP particles and with combinatorics from the misidentification of final state particles. The possible mismeasurements of NP masses through `feet' in the distributions are discussed. Finally, we demonstrate how the effects of different spin configurations can be included in the distributions.

39 pages, 14 figures (colour), JHEP class

References in corpus (20)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• High-Energy-Physics Event Generation with PYTHIA 6.1
• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• Bounds on Universal Extra Dimensions
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Precision SUSY Measurements at LHC
• Bosonic Supersymmetry? Getting Fooled at the LHC
• ISAJET 7.37: A Monte Carlo Event Generator for $pp$, $\bar{p}p$, and $e^{+}{e}^{-}$ Interactions
• Measurements of Masses in SUGRA Models at LHC
• Measuring sparticle masses in non-universal string inspired models at the LHC
• Distinguishing Spins in Supersymmetric and Universal Extra Dimension Models at the Large Hadron Collider
• PYTHIA 6.3 Physics and Manual
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• Measurement of SUSY masses via cascade decays for SPS 1a
• Spin Correlations in Monte Carlo Simulations
• Measurement of the Gluino Mass via Cascade Decays for SPS 1a
• AcerDET-2.0: a particle level fast simulation and reconstruction package for phenomenological studies on high p_T physics at LHC
• Simulating Supersymmetry with ISAJET 7.0/ ISASUSY 1.0
• Slepton Mass Measurements at the LHC

Cited by in corpus (74)

• QCD radiation in the production of heavy colored particles at the LHC
• Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
• On measuring the masses of pair-produced semi-invisibly decaying particles at hadron colliders
• Seeking Sgluons
• Physics searches at the LHC
• Top Partners at the LHC: Spin and Mass Measurement
• Mass Determination in SUSY-like Events with Missing Energy
• Dark Matter Particle Spectroscopy at the LHC: Generalizing MT2 to Asymmetric Event Topologies
• Accurate Mass Determinations in Decay Chains with Missing Energy
• A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
• Transverse masses and kinematic constraints: from the boundary to the crease
• Radiative seesaw: Warm dark matter, collider and lepton flavour violating signals
• Spin Measurements in Cascade Decays at the LHC
• Distinguishing Spins in Decay Chains at the Large Hadron Collider
• Reconstructing Sparticle Mass Spectra using Hadronic Decays
• Mass Determination of New States at Hadron Colliders
• Collider aspects of flavour physics at high Q
• \sqrt{s}_min: a global inclusive variable for determining the mass scale of new physics in events with missing energy at hadron colliders
• Testing the Majorana Nature of Gluinos and Neutralinos
• Using kinematic boundary lines for particle mass measurements and disambiguation in SUSY-like events with missing energy
• Same-sign top quarks as signature of light stops at the CERN LHC
• The Standard Model and Supersymmetric Flavor Puzzles at the Large Hadron Collider
• Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC
• Precise reconstruction of sparticle masses without ambiguities
• LHC diphoton excess from colorful resonances
• Algebraic Singularity Method for Mass Measurements with Missing Energy
• RECO level \sqrt{s}_{min} and subsystem \sqrt{s}_{min}: improved global inclusive variables for measuring the new physics mass scale in missing energy events at hadron colliders
• Collider signatures of gravitino dark matter with a sneutrino NLSP
• A hybrid method for determining particle masses at the Large Hadron Collider with fully identified cascade decays
• Accurate Mass Determinations in Decay Chains with Missing Energy: II
• Distinguishing Dark Matter Stabilization Symmetries Using Multiple Kinematic Edges and Cusps
• Discovery and Measurement of Sleptons, Binos, and Winos with a Z'
• Constrained invariant mass distributions in cascade decays. The shape of the "$m_{qll}$-threshold" and similar distributions
• Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider
• Supersymmetric particle mass measurement with invariant mass correlations
• NLO corrections to squark-squark production and decay at the LHC
• Mass determination in sequential particle decay chains
• Signals of a Sneutrino (N)LSP at the LHC
• Amplification of endpoint structure for new particle mass measurement at the LHC
• Mass Determination in Cascade Decays Using Shape Formulas
• Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
• LHC signature of supersymmetric models with non-universal sfermion masses
• Controlling ISR in sparticle mass reconstruction
• Mixed Higgsino Dark Matter from a Large SU(2) Gaugino Mass
• Identifying Dark Matter Event Topologies at the LHC
• NMSSM in disguise: discovering singlino dark matter with soft leptons at the LHC
• Improved mass measurement using the boundary of many-body phase space
• Spin Determination via Third Generation Cascade Decays
• Detecting kinematic boundary surfaces in phase space: particle mass measurements in SUSY-like events
• Hidden Thresholds: A Technique for Reconstructing New Physics Masses at Hadron Colliders
• Identifying Phase Space Boundaries with Voronoi Tessellations
• Squark Cascade Decays to Charginos/Neutralinos: Gluon Radiation
• Distinguishing spins in decay chains with photons at the Large Hadron Collider
• Extracting MSSM Masses From Heavy Higgs Decays to Four Leptons at the LHC
• Leptophilic Signals of a Sneutrino (N)LSP and Flavor Biases from Flavor-Blind SUSY
• Same-Sign Charginos and Majorana Neutralinos at the LHC
• Improving SUSY Spectrum Determinations at the LHC with Wedgebox Technique
• Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable
• Multi-Dimensional Phase Space Methods for Mass Measurements and Decay Topology Determination
• Discovery Potential of Selectron or Smuon as the Lightest Supersymmetric Particle at the LHC
• Kinematic Edges with Flavor Oscillation and Non-Zero Widths
• Measuring Masses in Semi-Invisible Final States at Electron-Positron Colliders
• LHC signals for Singlet Neutrinos from a Natural Warped Seesaw (I)
• Supersymmetry With Prejudice: Fitting the Wrong Model to LHC Data
• Neutralino Reconstruction at the LHC from Decay-frame Kinematics
• Energy spectra of massive two-body decay products and mass measurement
• Determining masses of supersymmetric particles
• Interpreting a CMS $lljj{p}_T^{\mathrm{miss}}$ Excess With the Golden Cascade of the MSSM
• Determination of supersymmetric masses using kinematic fits at the LHC
• General analysis of decay chains with three-body decays involving missing energy
• A New Approach for Reconstructing SUSY Particle Masses with a few fb^(-1) at the LHC
• Constraining slepton and chargino through compressed top squark search
• Momentum asymmetries as CP violating observables
• Applying Machine Learning Techniques To Intermediate-Length Cascade Decays