m_T2 : the truth behind the glamour

Abstract

We present the kinematic variable, m_T2, which is in some ways similar to the more familiar `transverse-mass', but which can be used in events where two or more particles have escaped detection. We define this variable and describe the event topologies to which it applies, then present some of its mathematical properties. We then briefly discuss two case studies which show how m_T2 is vital when reconstructing the masses of supersymmetric particles in mSUGRA-like and AMSB-like scenarios at the Large Hadron Collider.

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• Identifying the production process of new physics at colliders; symmetric or asymmetric?
• A Fat Gluino in Disguise
• Gauge-mediated supersymmetry breaking with generalized messenger sector at LHC
• Mass Measurement Using Energy Spectra in Three-body Decays
• Stop searches in flavourful supersymmetry
• The Influence of Lepton Portal on the WIMP-pFIMP framework
• Search for Heavy Stops with Merged Top-Jets
• Searches for direct slepton production in the compressed-mass corridor in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Momentum asymmetries as CP violating observables
• Lepton Flavor Violation: From Muon Decays to Muon Colliders
• Measurement of WWZ and ZH production cross sections at $\sqrt{s}$ = 13 and 13.6 TeV
• Heavy Higgs decay to $t\bar{t}Z$ and constraints on a $750$ GeV pseudoscalar
• CutLang V2: towards a unified Analysis Description Language
• Search for top squark pair production in a final state with two tau leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measuring the mass, width, and couplings of semi-invisible resonances with the Matrix Element Method
• Importance and construction of features in identifying new physics signals with deep learning
• Improving smuon searches with Neural Networks
• Supersymmetry with a Heavy Lightest Supersymmetric Particle
• Hunting for neutral, long-lived exotica at the LHC using a missing transverse energy signature
• The Lightest Massive Invisible Particles at the LHC
• Searches for Supersymmetry with the ATLAS Detector
• $M_{TN}$ is all you need: production of multiple semi-invisible resonances at hadron colliders
• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders
• Determining the squark mass at the LHC
• Measurements of $W^{+}{W}^{-}$ production in decay topologies inspired by searches for electroweak supersymmetry
• CutLang as an Analysis Description Language for Introducing Students to Analyses in Particle Physics
• Mass Determination of New Particle States
• Probing top quark anomalous moments in $W$ boson associated single top quark production at the LHC using polarization and spin correlation
• $\ge 4\mu$ signal from a vector-like lepton decaying to a muon-philic $Z^{\prime }$ boson at the LHC
• Energy peaks: a high energy physics outlook
• DeeLeMa: Missing information search with Deep Learning for Mass estimation
• Machine Learning Optimized Search for the $Z^{\prime }$ from $U(1{)}_{L_{\mu }-L_{\tau }}$ at the LHC
• $W^{\prime }$ Pair Production in the Light of CMS Searches
• Charged Slepton Flavor post the 8 TeV LHC: A Simplified Model Analysis of Low-Energy Constraints and LHC SUSY Searches
• Multi-Lepton Probes of the Drell-Yan Production of Triplet Higgses
• Could $M_{T2}$ be a singularity variable?
• Measuring Electroweak Quantum Numbers of Color Sextet Resonances at the LHC
• Higgs and $Z$ Assisted Stop Searches at Hadron Colliders
• Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions
• Top-Quark Mass Measurement in the Dilepton Channel Using {\it in situ} Jet Energy Scale Calibration
• Machine Learning Electroweakino Production
• Leveraging intermediate resonances to probe CP violation at colliders