Measurement of CP asymmetries in neutralino production at the ILC

Abstract

We study the prospects to measure the CP-sensitive triple-product asymmetries in neutralino production e+e- -> ~chi^0_i ~chi^0_1 and subsequent leptonic two-body decays ~chi^0_i -> ~l_R l, ~l_R -> ~chi^0_1 l, for l=e, mu, 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.

27 pages, 5 figures, minor changes, to appear in the EPJC

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Cited by in corpus (8)

• Physics at the e+ e- Linear Collider
• On the choice of beam polarization in $e^{+}{e}^{-}\to ZZ/Z\gamma$ and anomalous triple gauge-boson couplings
• Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions
• Lepton flavour violation: physics potential of a Linear Collider
• Probing the anomalous triple gauge boson couplings in $e^{+}{e}^{-}\to W^{+}{W}^{-}$ using $W$ polarizations with polarized beams
• Inclusive spin-momentum analysis and new physics at a polarized electron-positron collider
• Measurement of CP Violation in the MSSM Neutralino Sector with the ILD
• Optimising the ILC Setup: Physics Programme, Running Scenarios and Design Choices