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Control Regions

  1. Feb 29, 2016 #1

    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:
    http://www-cdf.fnal.gov/physics/ewk/wwllll/
     
  2. jcsd
  3. Feb 29, 2016 #2

    Orodruin

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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.
     
  4. Feb 29, 2016 #3

    ChrisVer

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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?
     
  5. Mar 1, 2016 #4

    mfb

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    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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