M_T2-assisted on-shell reconstruction of missing momenta and its application to spin measurement at the LHC

Abstract

We propose a scheme to assign a 4-momentum to each WIMP in new physics event producing a pair of mother particles each of which decays to an invisible weakly interacting massive particle (WIMP) plus some visible particle(s). The transverse components are given by the value that determines the event variable M_T2, while the longitudinal component is determined by the on-shell condition on the mother particle. Although it does not give the true WIMP momentum in general, this M_T2-assisted on-shell reconstruction of missing momenta provides kinematic variables well correlated to the true WIMP momentum, and thus can be useful for an experimental determination of new particle properties. We apply this scheme to some processes to measure the mother particle spin, and find that spin determination is possible even without a good knowledge of the new particle masses.

11 pages, 10 figures, typos are corrected, figures are replaced

References in corpus (6)

• Gluino Stransverse Mass
• Measuring superparticle masses at hadron collider using the transverse mass kink
• Accurate Mass Determinations in Decay Chains with Missing Energy
• Transverse Observables and Mass Determination at Hadron Colliders
• A General Method for Model-Independent Measurements of Particle Spins, Couplings and Mixing Angles in Cascade Decays with Missing Energy at Hadron Colliders
• Testing Gluino Spin with Three-Body Decays

Cited by in corpus (14)

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• A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
• Right-handed sneutrino dark matter in the NMSSM
• A model independent spin analysis of fundamental particles using azimuthal asymmetries
• Using kinematic boundary lines for particle mass measurements and disambiguation in SUSY-like events with missing energy
• Identification of Dark Matter particles with LHC and direct detection data
• Precise reconstruction of sparticle masses without ambiguities
• Reconstructing the Higgs boson in dileptonic W decays at hadron collider
• Mass determination in sequential particle decay chains
• Precision Determination of Invisible-Particle Masses at the CERN LHC: II
• Effects of QCD radiation on inclusive variables for determining the scale of new physics at hadron colliders
• Measuring the Higgs boson mass with transverse mass variables
• Spin Determination via Third Generation Cascade Decays
• General analysis of signals with two leptons and missing energy at the Large Hadron Collider