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The initial objective is to develop a search for mesoscopic quirks using the ATLAS detector. The strategy is to identify simple and relatively loose identification criteria that provide adequate sensitivity while minimizing the dependence on specific model assumptions and uncertainties in the dynamics of quirk pairs. In time, we hope to expand the search signature to include macroscopic quirks, building on experience and tools developed for this simplest case.
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Second, the quirks move slowly enough that the hits they make in the detector can be out-of-time with respect to particles traveling at the speed of light, a problem that is obviously less severe in the inner layers of the detector. So, the reconstruction technique focuses on the elements of the inner detector: the pixels, SCT and TRT tracking detectors. Finally, the most critical inner layers of the detector, the ATLAS pixels, have limited dynamic range for large dE/dx, so hits from very slow moving quirks can simply be lost. Meanwhile, the internal dynamics of the bound quirk pair lead to some oddities in the energy deposition and trajectories of the quirk pairs that can significantly modify the basic signature. The magnitude of these effects needs to be understood to fully define the signature and the required background samples.
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