Spin Discrimination in Three-Body Decays

Abstract

The identification of the correct model for physics beyond the Standard Model requires the determination of the spin of new particles. We investigate to which extent the spin of a new particle $X$ can be identified in scenarios where it decays dominantly in three-body decays $X\to f\bar{f}Y$. Here we assume that $Y$ is a candidate for dark matter and escapes direct detection at a high energy collider such as the LHC. We show that in the case that all intermediate particles are heavy, one can get information on the spins of $X$ and $Y$ at the LHC by exploiting the invariant mass distribution of the two standard model fermions. We develop a model-independent strategy to determine the spins without prior knowledge of the unknown couplings and test it in a series of Monte Carlo studies.

31+1 pages, 4 figures, 8 tables, JHEP.cls included

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• Bounds on the Fermion-Bulk Masses in Models with Universal Extra Dimensions
• Gluino Decay as a Probe of High Scale Supersymmetry Breaking
• Discovery in Drell-Yan Processes at the LHC
• Spin effects in the antler event topology at hadron colliders
• Determination of the Spin of New Resonances in Electroweak Gauge Boson Pair Production at the LHC
• Characterizing dark matter at the LHC in Drell-Yan events
• General analysis of decay chains with three-body decays involving missing energy
• Spin and Chirality Effects in Antler-Topology Processes at High Energy $e^{+}{e}^{-}$ Colliders