Control_Regions.htmlControl Regions: What Are They?

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Discussion Overview

The discussion revolves around the concept of control regions in the context of particle physics, specifically in relation to signal regions and their role in ensuring accurate simulation modeling of data. The focus includes theoretical understanding and application in experimental settings.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires whether control regions are synonymous with signal regions and expresses confusion regarding their purpose in simulation modeling.
  • Another participant clarifies that control regions are orthogonal to signal regions, suggesting that they are areas where no signal is expected, used to understand background processes.
  • A third participant questions the rationale behind the characteristics of a Drell-Yan control region, specifically the requirements for low missing ET and dilepton mass near the Z boson mass.
  • A subsequent reply explains that this particular control region is designed to minimize the contribution from WW production, allowing for the assessment of selection efficiencies.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between control regions and signal regions, with some clarifying their distinct roles while others raise questions about specific examples, indicating that the discussion remains unresolved.

Contextual Notes

There are assumptions regarding the definitions and roles of control regions and signal regions that are not fully explored. The discussion also touches on specific conditions related to Drell-Yan processes that may not be universally applicable.

ChrisVer
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What are control regions? Is it a different name for "signal region"?
If yes I don't really understand what they mean with the following:
In order to ensure that simulation is properly modeling the data, several control regions which are orthogonal to the signal regions are investigated.
http://www-cdf.fnal.gov/physics/ewk/wwllll/
 
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No, as your quote states, they are orthogonal to the signal regions. It means that you expect no signal there and so you can try to use them to see if you understand your background.
 
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Strange, then why would a Drell-Yan control region require low missing ET and dilepton mass around the Z boson's one?
 
It is one of the control regions for WW production. With low missing ET and a mass around the Z peak the contribution from WW is negligible, and you can check selection efficiencies.
 
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