Measurement of SUSY masses via cascade decays for SPS 1a

Abstract

If R-parity conserving supersymmetry exists below the TeV-scale, new particles will be produced and decay in cascades at the LHC. The lightest supersymmetric particle will escape the detectors, thereby complicating the full reconstruction of the decay chains. In this paper we expand on existing methods for determining the masses of the particles in the cascade from endpoints of kinematical distributions. We perform scans in the mSUGRA parameter space to delimit the region where this method is applicable. From the examination of theoretical distributions for a wide selection of mass scenarios it is found that caution must be exerted when equating the theoretical endpoints with the experimentally obtainable ones. We provide analytic formulae for the masses in terms of the endpoints most readily available. Complications due to the composite nature of the endpoint expressions are discussed in relation to the detailed analysis of two points on the SPS~1a line. Finally we demonstrate how a Linear Collider measurement can improve dramatically on the precision of the masses obtained.

arXiv comment57 pages, several figures, some of which should be viewed/printed in colour. v2: version accepted for publication

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• High-Energy-Physics Event Generation with PYTHIA 6.1
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Supersymmetric Dark Matter in Light of WMAP
• Strong Constraints on the Parameter Space of the MSSM from Charge and Color Breaking Minima
• Determining the spin of supersymmetric particles at the LHC using lepton charge asymmetry
• Charge and Colour Breaking in the Constrained MSSM

Cited by in corpus (109)

• Dark Matter Candidates: A Ten-Point Test
• Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
• Minimal Kinematic Constraints and MT2
• Model-Independent Jets plus Missing Energy Searches
• Supersymmetry and the LHC Inverse Problem
• 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
• Visible Effects of Invisible Hidden Valley Radiation
• Accurate Mass Determinations in Decay Chains with Missing Energy
• B, D and K decays
• 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
• Measurement of the Gluino Mass via Cascade Decays for SPS 1a
• Squark and Gluino Production with Jets
• Invariant mass distributions in cascade decays
• Reconstructing Sparticle Mass Spectra using Hadronic Decays
• Superpartner mass measurements with 1D decomposed MT2
• Measuring Supersymmetry
• It's a Gluino!
• 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
• Weak boson fusion production of supersymmetric particles at the LHC
• Determining SUSY model parameters and masses at the LHC using cross-sections, kinematic edges and other observables
• Precision gluino mass at the LHC in SUSY models with decoupled scalars
• Phenomenology of the nMSSM from colliders to cosmology
• Determining the Dark Matter Relic Density in the Minimal Supergravity Stau-Neutralino Coannihilation Region at the Large Hadron Collider
• Kinematic Cusps: Determining the Missing Particle Mass at Colliders
• Same-sign top quarks as signature of light stops at the CERN LHC
• Using kinematic boundary lines for particle mass measurements and disambiguation in SUSY-like events with missing energy
• Sparticle Spectra and LHC Signatures for Large Volume String Compactifications
• Gravitino Dark Matter Scenarios with Massive Metastable Charged Sparticles at the LHC
• Precise reconstruction of sparticle masses without ambiguities
• The Precision Determination of Invisible-Particle Masses at the LHC
• Constraining Dark Matter in the MSSM at the LHC
• Supersymmetry Simulations with Off-Shell Effects for LHC and ILC
• Phenomenology of Mirror Fermions in the Littlest Higgs Model with T-Parity
• 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
• Accurate Mass Determinations in Decay Chains with Missing Energy: II
• Constrained invariant mass distributions in cascade decays. The shape of the "$m_{qll}$-threshold" and similar distributions
• On-shell constrained $M_2$ variables with applications to mass measurements and topology disambiguation
• Supersymmetric particle mass measurement with invariant mass correlations
• Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider
• Mass determination in sequential particle decay chains
• Non-Diagonal and Mixed Squark Production at Hadron Colliders
• Displaced vertices and long-lived charged particles in the NMSSM with right-handed sneutrinos
• Perspectives for the detection and measurement of Supersymmetry in the focus point region of mSUGRA models with the ATLAS detector at LHC
• Precision Determination of Invisible-Particle Masses at the CERN LHC: II
• Kinematic Cusps With Two Missing Particles I: Antler Decay Topology
• SUSY parameter determination at the LHC using cross sections and kinematic edges
• Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
• Light neutralinos at LHC in cosmologically-inspired scenarios: new benchmarks in the search for supersymmetry
• LHC signature of supersymmetric models with non-universal sfermion masses
• Controlling ISR in sparticle mass reconstruction
• Identifying Dark Matter Event Topologies at the LHC
• Kinematic Cusps with Two Missing Particles II: Cascade Decay Topology
• Sparticle masses in deflected mirage mediation
• Mass reconstruction with $M_2$ under constraint in semi-invisible production at a hadron collider
• NMSSM in disguise: discovering singlino dark matter with soft leptons at the LHC
• 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
• Bigger, Better, Faster, More at the LHC
• Bottom-Up Reconstruction Scenarios for (un)constrained MSSM Parameters at the LHC
• Using sorted invariant mass variables to evade combinatorial ambiguities in cascade decays
• Constrained $\sqrt{{\hat{S}}_{min}}$ and reconstructing with semi-invisible production at hadron colliders
• Testing Invisible Momentum Ansatze in Missing Energy Events at the LHC
• Identifying Phase Space Boundaries with Voronoi Tessellations
• Squark Cascade Decays to Charginos/Neutralinos: Gluon Radiation
• Determining the mass for an ultralight gravitino at LHC
• Initial determination of the spins of the gluino and squarks at LHC
• Wedgebox analysis of four-lepton events from neutralino pair production at the LHC
• Extracting MSSM Masses From Heavy Higgs Decays to Four Leptons at the LHC
• Determining the Dark Matter Particle Mass through Antler Topology Processes at Lepton Colliders
• Improving SUSY Spectrum Determinations at the LHC with Wedgebox Technique
• A Sneutrino NLSP in the $\nu$CMSSM
• Distinguishing between MSSM and NMSSM by combined LHC and ILC analyses
• Same-Sign Charginos and Majorana Neutralinos at the LHC
• Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable
• Kinematic Edges with Flavor Splitting and Mixing
• Sparticle masses from transverse mass kinks at the LHC: the case of Yukawa-unified SUSY GUTs
• Multi-Dimensional Phase Space Methods for Mass Measurements and Decay Topology Determination
• Flavour Structure of R-violating Neutralino Decays at the LHC
• Supersymmetry With Prejudice: Fitting the Wrong Model to LHC Data
• Kinematic Edges with Flavor Oscillation and Non-Zero Widths
• Discriminating Electroweak-ino Parameter Ordering at the LHC and Its Impact on LFV Studies
• Measuring Masses in Semi-Invisible Final States at Electron-Positron Colliders
• Discovery Potential of Selectron or Smuon as the Lightest Supersymmetric Particle at the LHC
• Measuring Supersymmetry with Heavy Scalars
• Search at the CERN LHC for a light neutralino of cosmological interest
• Neutralino Reconstruction at the LHC from Decay-frame Kinematics
• Momentum reconstruction at the LHC for probing CP-violation in the stop sector
• New techniques for chargino-neutralino detection at LHC
• Energy spectra of massive two-body decay products and mass measurement
• Kinematic Focus Point Method for Particle Mass Measurements in Missing Energy Events
• CP-violation in SUSY cascades at the LHC
• Dreaming Awake: Disentangling the Underlying Physics in Case of a SUSY-like Discovery at the LHC
• Kinematic Edge Detection Using Finite Impulse Response Filters
• General analysis of decay chains with three-body decays involving missing energy
• Reconstruction of stop quark mass at the LHC
• Using rates to measure mixed modulus-anomaly mediated supersymmetry breaking at the LHC
• Constraining slepton and chargino through compressed top squark search
• Gauge-mediated supersymmetry breaking with generalized messenger sector at LHC
• Ordered Kinematic Endpoints for 5-body Cascade Decays
• Looking for lepton flavour violation in supersymmetry at the LHC
• Applying Machine Learning Techniques To Intermediate-Length Cascade Decays
• Complementarity of the CERN Large Hadron Collider and the $e^{+}{e}^{-}$ International Linear Collider
• Flavor and LHC Searches for New Physics