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Work on implementing quirks in Geant4 has begun, but is far from trivial because it involves fundamental changes to the way the Geant propagates particles through the detector: pairwise rather than individually. In parallel, we are beginning to develop background samples given our current level of understanding for the signature.
References
[arXiv:0805.4642v3 hep-ph|http://arxiv.org/abs/0805.4642]