Fake Rate Definitions

Numerator definition

We form a "relaxed numerator" compared to what we would get solely by using our photon ID. Since we will start by using sigma_iEtaiEta templates, this is the variable we choose to relax. Our numerator definition is the same ID as the High pT photon ID, but without any sigma_iEtaiEta cut.

Denominator definition

We form a "loose-but-not-tight" denominator. An object must pass

iso < 5 * (iso cut) || iso < 0.2 * photon->pt()

where "iso" is each isolation variable used in the High pT photon ID, of which there are two: charged hadron isolation and "corrected" photon isolation. In addition, we require the object to fail at least one of the High pT photon ID variables, except for the CSEV, which can be applied offline, if desired.

Sigma_iEtaiEta

Since sigma_iEtaiEta isn't used in the numerator but is one of the ID-vetos in the denominator, it's possible for an object to end up in both our numerator and denominator definitions.

Our code

https://github.com/cms-exotica-diphotons/diphoton-analysis/blob/master/CommonClasses/interface/PhotonID.h

-- AndrewBuccilli - 2016-03-07

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Topic revision: r2 - 2016-03-07 - AndrewBuccilli
 
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