The European Physical Journal C

, 72:1854

Measurement of CP asymmetries in neutralino production at the ILC

  • O. Kittel
  • G. Moortgat-Pick
  • K. Rolbiecki
  • P. Schade
  • M. Terwort
Regular Article - Theoretical Physics

Abstract

We study the prospects to measure the CP-sensitive triple-product asymmetries in neutralino production \(e^{+} e^{-} \to\tilde{\chi}^{0}_{i}\tilde{\chi}^{0}_{1}\) and subsequent leptonic two-body decays \(\tilde{\chi}^{0}_{i} \to \tilde{\ell}_{R} \ell\), \(\tilde{\ell}_{R} \to \tilde{\chi}^{0}_{1} \ell\), for =e,μ, within the Minimal Supersymmetric Standard Model. We include a full detector simulation of the International Large Detector for the International Linear Collider. The simulation was performed at a center-of-mass energy of \(\sqrt{s}=500\) GeV, including the relevant Standard Model background processes, a realistic beam energy spectrum, beam backgrounds and a beam polarization of 80% and −60% for the electron and positron beams, respectively. In order to effectively disentangle different signal samples and reduce SM and SUSY backgrounds we apply a method of kinematic reconstruction. Assuming an integrated luminosity of 500 fb−1 collected by the experiment and the performance of the current ILD detector, we arrive at a relative measurement accuracy of 10% for the CP-sensitive asymmetry in our scenario. We demonstrate that our method of signal selection using kinematic reconstruction can be applied to a broad class of scenarios and it allows disentangling processes with similar kinematic properties.

Copyright information

© Springer-Verlag / Società Italiana di Fisica 2012

Authors and Affiliations

  • O. Kittel
    • 1
  • G. Moortgat-Pick
    • 2
    • 3
  • K. Rolbiecki
    • 3
  • P. Schade
    • 3
    • 4
  • M. Terwort
    • 3
  1. 1.Departamento de Física Teórica y del Cosmos and CAFPEUniversidad de GranadaGranadaSpain
  2. 2.University of HamburgHamburgGermany
  3. 3.DESYHamburgGermany
  4. 4.CERNGeneve 23Switzerland

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