A novel technique for measuring masses of a pair of semi-invisibly decaying particles

Abstract

Motivated by evidence for the existence of dark matter, many new physics models predict the pair production of new particles, followed by the decays into two invisible particles, leading to a momentum imbalance in the visible system. For the cases where all four components of the vector sum of the two `missing' momenta are measured from the momentum imbalance, we present analytic solutions of the final state system in terms of measureable momenta, with the mass shell constraints taken into account. We then introduce new variables which allow the masses involved in the new physics process, including that of the dark matter particles, to be extracted. These are compared with a selection of variables in the literature, and possible applications at lepton and hadron colliders are discussed.

5 pages, 4 figures

References in corpus (7)

• Herwig++ Physics and Manual
• Gluino Stransverse Mass
• Minimal Kinematic Constraints and MT2
• Central Exclusive Particle Production at High Energy Hadron Colliders
• Transverse Observables and Mass Determination at Hadron Colliders
• Mass Determination of New States at Hadron Colliders
• Detection of two-photon exclusive production of supersymmetric pairs at the LHC

Cited by in corpus (9)

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• Exploring properties of long-lived particles in inelastic dark matter models at Belle II
• Singularity Variables for Missing Energy Event Kinematics
• New method for non-standard invisible particle searches in tau lepton decays
• Measuring Masses in Semi-Invisible Final States at Electron-Positron Colliders
• Extracting gluino endpoints with event topology patterns
• Sharpening $m_{T2}$ cusps: the mass determination of semi-invisibly decaying particles from a resonance
• Kinematical Observables in Semi-Invisible Decays