Photon ID Certification Results

Version 1.0 for p14

last update November 08, 2004

Recommended Photon-selection cuts:

	SCONE (no T42)
Selection Cuts	EM id 10, 11, or -11 isolation below 0.15 EM fraction above 0.9 width of EM cluster in EM3 below 14 squared cm central calorimeter, fiducial region only spatial track match chi2 probability below 0.001

An example of photon candidate selection for TMBTrees is given below:
      // Container for photons:
      vector<TMBEmcl *> photons;

      for ( Int_t i=0; i<fEmcl->GetLast()+1; ++i ) {
          TMBEmcl *emcl = (TMBEmcl *) fEmcl->At(i);
          // if not a Simple cone algorithm -- reject the candidate
          if ( strcmp(emcl->algoname(),"scone") != 0 ) continue;
          // if not of a sufficient quality -- reject the candidate
          bool quality =
               abs(emcl->id()) < 12                                  &&      // id 10, 11, -11
               emcl->iso() < 0.15                                                &&      // isolation below 0.15
               emcl->emfrac() > 0.9                                           &&      // emfraction above 90%
               *(emcl->flrS1(3)) < 14                                         &&      // EM3 width below 14 cm2
               emcl->is_in_fiducial()                                           &&      // fiducial region of Calorimeter
               fabs(emcl->CalDetectorEta()) < 1.1                  &&      // central region only
   emcl->track_match_spatialchi2prob() < 0.001;           // no track match
   if ( !quality ) continue;

           // EM object passed selection criteria, add it to the container
           photons.push_back(emcl);
      } // loop over em clusters

A description of the results from the photon certification can be found in D0-note 4487.

Last update Nov 8, 2004 by Yurii Maravin.