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General analysis of decay chains with three-body decays involving missing energy

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Abstract

A model-independent analysis of decays of the form C → ℓ + ℓ − A (ℓ = e, μ) is presented, including the possibility that this three-body decay is preceded by an additional decay step D → jC. Here A, C and D are heavy new-physics particles and j stands for a quark jet. It is assumed that A escapes direct detection in a collider experiment, so that one cannot kinematically reconstruct the momenta of the new particles. Instead, information about their properties can be obtained from invariant-mass distributions of the visible decay products, i.e. the di-lepton (ℓℓ) and jet-lepton (jℓ) invariant-mass distributions. All possible spin configurations and renormalizable couplings of the new particles are considered, and explicit expressions for the invariant-mass distributions are derived, in a formulation that separates the coupling parameters from the spin and kinematic information. In a numerical analysis, it is shown how these properties can be determined independently from a fit to the m ℓℓ and m jℓ distributions.

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Authors and Affiliations

  1. Department of Physics, Carnegie Mellon University, Pittsburgh, PA, 15213, U.S.A.

    Chien-Yi Chen

  2. Pittsburgh Particle-physics Astro-physics & Cosmology Center (Pitt-PACC), Department of Physics & Astronomy, University of Pittsburgh, Pittsburgh, PA, 15260, U.S.A.

    A. Freitas

Authors
  1. Chien-Yi Chen
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  2. A. Freitas
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Correspondence to A. Freitas.

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ArXiv ePrint: 1110.6192

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Chen, CY., Freitas, A. General analysis of decay chains with three-body decays involving missing energy. J. High Energ. Phys. 2012, 124 (2012). https://doi.org/10.1007/JHEP01(2012)124

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  • DOI: https://doi.org/10.1007/JHEP01(2012)124

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