PUSubtractionMethods.cc

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// PUSubtractionMethods.cc
// Authors: Alex Barbieri
//          Kalanand Mishra, Fermilab
//          Inga Bucinskaite, UIC
//
// This file should contain the different algorithms used to perform PU, UE subtraction.


//#include "DataFormats/L1TCalorimeter/interface/CaloRegion.h"
#include "L1Trigger/L1TCalorimeter/interface/PUSubtractionMethods.h"
#include "TMath.h"

//#include "DataFormats/L1CaloTrigger/interface/L1CaloRegionDetId.h"
#include <vector>

namespace l1t {

  void HICaloRingSubtraction(const std::vector<l1t::CaloRegion> & regions,
                 std::vector<l1t::CaloRegion> *subRegions,
                 CaloParamsHelper const *params)
  {
    int puLevelHI[L1CaloRegionDetId::N_ETA];

    for(unsigned i = 0; i < L1CaloRegionDetId::N_ETA; ++i)
    {
      puLevelHI[i] = 0;
    }

    for(std::vector<CaloRegion>::const_iterator region = regions.begin();
    region != regions.end(); region++){
      puLevelHI[region->hwEta()] += region->hwPt();
    }

    for(unsigned i = 0; i < L1CaloRegionDetId::N_ETA; ++i)
    {
      //puLevelHI[i] = floor(((double)puLevelHI[i] / (double)L1CaloRegionDetId::N_PHI)+0.5);
      puLevelHI[i] = (puLevelHI[i] + 9) * 455 / (1 << 13); // approx equals X/18 +0.5
    }

    for(std::vector<CaloRegion>::const_iterator region = regions.begin(); region!= regions.end(); region++){
      int subPt = std::max(0, region->hwPt() - puLevelHI[region->hwEta()]);
      int subEta = region->hwEta();
      int subPhi = region->hwPhi();


      ROOT::Math::LorentzVector<ROOT::Math::PxPyPzE4D<double> > ldummy(0,0,0,0);

      CaloRegion newSubRegion(*&ldummy, 0, 0, subPt, subEta, subPhi, region->hwQual(), region->hwEtEm(), region->hwEtHad());
      subRegions->push_back(newSubRegion);
    }
  }

  void simpleHWSubtraction(const std::vector<l1t::CaloRegion> & regions,
               std::vector<l1t::CaloRegion> *subRegions)
  {
    for(std::vector<CaloRegion>::const_iterator region = regions.begin();
    region != regions.end(); region++){
      int subEta = region->hwEta();
      int subPhi = region->hwPhi();
      int subPt = region->hwPt();

      if(subPt != (2<<10)-1)
    subPt = subPt - (10+subEta); // arbitrary value chosen in meeting
      if(subPt < 0)
    subPt = 0;
      ROOT::Math::LorentzVector<ROOT::Math::PxPyPzE4D<double> > ldummy(0,0,0,0);

      CaloRegion newSubRegion(*&ldummy, 0, 0, subPt, subEta, subPhi, region->hwQual(), region->hwEtEm(), region->hwEtHad());
      subRegions->push_back(newSubRegion);
    }
  }



  void RegionCorrection(const std::vector<l1t::CaloRegion> & regions,
            std::vector<l1t::CaloRegion> *subRegions,
            CaloParamsHelper const *params)
  {

    std::string regionPUSType = params->regionPUSType();

    if(regionPUSType == "None") {
      for(std::vector<CaloRegion>::const_iterator notCorrectedRegion = regions.begin();
      notCorrectedRegion != regions.end(); notCorrectedRegion++){
    CaloRegion newSubRegion= *notCorrectedRegion;
    subRegions->push_back(newSubRegion);
      }
    }

    if (regionPUSType == "HICaloRingSub") {
      HICaloRingSubtraction(regions, subRegions, params);
    }

    if (regionPUSType == "PUM0") {
      int puMult = 0;

      // ------------ This calulates PUM0 ------------------
      for(std::vector<CaloRegion>::const_iterator notCorrectedRegion = regions.begin();
      notCorrectedRegion != regions.end(); notCorrectedRegion++){
    int regionET = notCorrectedRegion->hwPt();
    if (regionET > 0) {puMult++;}
      }
      int pumbin = (int) puMult/22;
      if(pumbin == 18) pumbin = 17; // if puMult = 396 exactly there is an overflow

      for(std::vector<CaloRegion>::const_iterator notCorrectedRegion = regions.begin();
      notCorrectedRegion != regions.end(); notCorrectedRegion++){

    int regionET = notCorrectedRegion->hwPt();
    int regionEta = notCorrectedRegion->hwEta();
    int regionPhi = notCorrectedRegion->hwPhi();

    //int puSub = ceil(regionPUSParams[18*regionEta+pumbin]*2);
    int puSub = params->regionPUSValue(pumbin, regionEta);
    // The values in regionSubtraction are MULTIPLIED by
    // RegionLSB=.5 (physicalRegionEt), so to get back unmultiplied
    // regionSubtraction we want to multiply the number by 2
    // (aka divide by LSB).

    int regionEtCorr = std::max(0, regionET - puSub);
    if(regionET == 1023)
      regionEtCorr = 1023; // do not subtract overflow regions
    if((regionET==255) && (regionEta < 4 || regionEta > 17))
      regionEtCorr = 255;

    ROOT::Math::LorentzVector<ROOT::Math::PxPyPzE4D<double> > lorentz(0,0,0,0);
    CaloRegion newSubRegion(*&lorentz, 0, 0, regionEtCorr, regionEta, regionPhi, notCorrectedRegion->hwQual(), notCorrectedRegion->hwEtEm(), notCorrectedRegion->hwEtHad());
    subRegions->push_back(newSubRegion);
      }
    }
  }
}