The Role of Beam polarization for Radiative Neutralino Production at the ILC

Abstract

We analyze the impact of electron and positron beam polarization on radiative neutralino production at the International Linear Collider (ILC). We focus on three different mSUGRA scenarios in turn at the Higgs strahlung threshold, the top pair production threshold, and at $\sqrt{s} =500\GeV$. In these scenarios at the corresponding $\sqrt{s}$, radiative neutralino production is the only supersymmetric production mechanism which is kinematically allowed. The heavier neutralinos, and charginos as well as the sleptons, squarks and gluinos are too heavy to be pair produced. We calculate the signal cross section and also the Standard Model background from radiative neutrino production. For our scenarios, we obtain significances larger than 10 and signal to background ratios between 2% and 5%, if we have electron beam polarization $P_{e^{-}}=0.0-0.8$ and positron beam polarization $P_{e^{+}}=0.0-0.3$. If we have electron beam polarization of $P_{e^{-}}=0.9$, then the signal is observable with $P_{e^{+}}=0.0$ but both the significance and the signal to background ratio are significantly improved for $P_{e^{+}}=0.3$.

arXiv comment12 pages, 12 figures. v2 includes additional discussion and references

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• Illuminating Dark Matter at the ILC
• Rare meson decays into very light neutralinos
• Shedding Light on the Dark Sector with Direct WIMP Production
• R-Parity Violation and Light Neutralinos at SHiP and the LHC
• Gravitino cosmology with a very light neutralino
• Measuring a Light Neutralino Mass at the ILC: Testing the MSSM Neutralino Cold Dark Matter Model
• Chargino and Neutralino Production at e+e- Colliders in the Complex MSSM: A Full One-Loop Analysis
• Normal tau polarisation as a sensitive probe of CP violation in chargino decay
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• How light can the lightest neutralino be?