A New Method for the Spin Determination of Dark Matter

Abstract

We construct a new kinematical variable that is able to fully reconstruct the absolute value, and partially reconstruct the sign, of the angular distribution in the center of momentum system of a decaying particle in certain cases where the center of momentum system is only known up to a two-fold ambiguity. After making contact with Drell-Yan production at the Large Hadron Collider, we apply this method to the pair-production of dark matter in association with two charged leptons at the International Linear Collider and show that for a small intermediate width, perfect agreement is found with the true angular distribution in the absence of initial state radiation. In the presence of initial state radiation, we find that the modification to the angular distributions is small for most angles and that the different spin combinations should still be distinguishable. This enables us to determine the spin of the mother particle and the dark matter particle in certain cases.

16 pages, 11 figures

References in corpus (11)

• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• A direct empirical proof of the existence of dark matter
• FeynRules - Feynman rules made easy
• M_T2-assisted on-shell reconstruction of missing momenta and its application to spin measurement at the LHC
• A General Method for Model-Independent Measurements of Particle Spins, Couplings and Mixing Angles in Cascade Decays with Missing Energy at Hadron Colliders
• Simulating spin-3/2 particles at colliders
• Discriminating spin through quantum interference
• Spin Analysis of Supersymmetric Particles
• Determining Spin through Quantum Azimuthal-Angle Correlations
• Spin Determination via Third Generation Cascade Decays
• Distinguishing spins in decay chains with photons at the Large Hadron Collider

Cited by in corpus (6)

• Exploring properties of long-lived particles in inelastic dark matter models at Belle II
• Determining the Dark Matter Particle Mass through Antler Topology Processes at Lepton Colliders
• Neutron stars with spin polarized self-interacting dark matter
• Spin and Chirality Effects in Antler-Topology Processes at High Energy $e^{+}{e}^{-}$ Colliders
• Decoding Dark Matter at future $e^{+}{e}^{-}$ colliders
• Distinguishing nonstandard scalar and fermionic charged particles at future $e^{+}{e}^{-}$ collider