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ATLAS has no experiment-wide definition of "fiducial", it basically means sensitive to signal. The definition is confusing because, unlike most experiments, ATLAS (and CMS, D0, CDF, etc) doesn't just define the physical area where the experiment is sensitive, they also define collision properties. This means the definition of fiducial isn't limited to the ...


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This presentation (NB: PDF) has a "jargon" page that states, Fiducial (Webster's): Taken as a standard of reference Founded on faith or trust Having a nature to be trusted Fiducial Volume (Particle Physics): The volume used to make physics measurements The volume where the detector is assumed to be well understood With the ...


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In some detector experiments, The response at the periphery of the detector is poorly understood. The majority of background events interact in the periphery of the detector. The periphery of the detector is the final shielding. Some parts of the detector may be broken. In such cases, results from such parts of the detector are ignored. The results are ...


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There are two methods for making predictions for LHC searches: Data-driven. If you are searching for a signal, extrapolate the background prediction from a "sideband" region to a "signal" region of phase space. Monte Carlo (MC). Generate events with in pseudo-experiments (event generation from matrix elements, followed showering, hadronization, and ...


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Have you heard of the "bubble chamber"? It is like a cloud chamber, but uses liquid hydrogen (usually). When you take a liquid to a temperature/pressure where bubbles could form if there is a nucleation site, you can indeed observe traces. Now whether you observed something like this in your bathroom is hard to estimate. Supersaturated liquids (like hot ...



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