L1GctJetFinderBase.cc

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#include "L1Trigger/GlobalCaloTrigger/interface/L1GctJetFinderBase.h"
 
#include "CondFormats/L1TObjects/interface/L1GctJetFinderParams.h"
#include "CondFormats/L1TObjects/interface/L1GctChannelMask.h"
#include "DataFormats/L1CaloTrigger/interface/L1CaloRegion.h"
#include "DataFormats/L1GlobalCaloTrigger/interface/L1GctInternJetData.h"
 
#include "L1Trigger/GlobalCaloTrigger/interface/L1GctJetSorter.h"
#include "L1Trigger/GlobalCaloTrigger/interface/L1GctJetEtCalibrationLut.h"
 
#include "FWCore/MessageLogger/interface/MessageLogger.h"
 
//DEFINE STATICS
const unsigned int L1GctJetFinderBase::MAX_JETS_OUT = 6;
const unsigned int L1GctJetFinderBase::N_EXTRA_REGIONS_ETA00 = 2;
const unsigned int L1GctJetFinderBase::COL_OFFSET = L1GctJetFinderParams::NUMBER_ETA_VALUES + N_EXTRA_REGIONS_ETA00;
const unsigned int L1GctJetFinderBase::N_JF_PER_WHEEL = ((L1CaloRegionDetId::N_PHI) / 2);
 
const unsigned int L1GctJetFinderBase::MAX_REGIONS_IN = L1GctJetFinderBase::COL_OFFSET * L1GctJetFinderBase::N_COLS;
const unsigned int L1GctJetFinderBase::N_COLS = 2;
const unsigned int L1GctJetFinderBase::CENTRAL_COL0 = 0;
 
L1GctJetFinderBase::L1GctJetFinderBase(int id)
    : L1GctProcessor(),
      m_id(id),
      m_neighbourJetFinders(2),
      m_idInRange(false),
      m_gotNeighbourPointers(false),
      m_gotJetFinderParams(false),
      m_gotJetEtCalLuts(false),
      m_gotChannelMask(false),
      m_positiveEtaWheel(id >= (int)(L1CaloRegionDetId::N_PHI / 2)),
      m_minColThisJf(0),
      m_CenJetSeed(0),
      m_FwdJetSeed(0),
      m_TauJetSeed(0),
      m_EtaBoundry(0),
      m_jetEtCalLuts(),
      m_useImprovedTauAlgo(false),
      m_ignoreTauVetoBitsForIsolation(false),
      m_tauIsolationThreshold(0),
      m_HttSumJetThreshold(0),
      m_HtmSumJetThreshold(0),
      m_EttMask(),
      m_EtmMask(),
      m_HttMask(),
      m_HtmMask(),
      m_inputRegions(MAX_REGIONS_IN),
      m_sentProtoJets(MAX_JETS_OUT),
      m_rcvdProtoJets(MAX_JETS_OUT),
      m_keptProtoJets(MAX_JETS_OUT),
      m_outputJets(MAX_JETS_OUT),
      m_sortedJets(MAX_JETS_OUT),
      m_outputHfSums(),
      m_outputJetsPipe(MAX_JETS_OUT),
      m_outputEtSumPipe(),
      m_outputExSumPipe(),
      m_outputEySumPipe(),
      m_outputHtSumPipe(),
      m_outputHxSumPipe(),
      m_outputHySumPipe() {
  // Call reset to initialise vectors for input and output
  this->reset();
  //Check jetfinder setup
  if (m_id < 0 || m_id >= static_cast<int>(L1CaloRegionDetId::N_PHI)) {
    if (m_verbose) {
      edm::LogWarning("L1GctSetupError") << "L1GctJetFinderBase::L1GctJetFinderBase() : Jet Finder ID " << m_id
                                         << " has been incorrectly constructed!\n"
                                         << "ID number should be between the range of 0 to "
                                         << L1CaloRegionDetId::N_PHI - 1 << "\n";
    }
  } else {
    m_idInRange = true;
  }
}
 
L1GctJetFinderBase::~L1GctJetFinderBase() {}
 
void L1GctJetFinderBase::setNeighbourJetFinders(const std::vector<L1GctJetFinderBase*>& neighbours) {
  m_gotNeighbourPointers = true;
  if (neighbours.size() == 2) {
    m_neighbourJetFinders = neighbours;
  } else {
    m_gotNeighbourPointers = false;
    if (m_verbose) {
      edm::LogWarning("L1GctSetupError") << "L1GctJetFinderBase::setNeighbourJetFinders() : In Jet Finder ID " << m_id
                                         << " size of input vector should be 2, but is in fact " << neighbours.size()
                                         << "\n";
    }
  }
  if (m_neighbourJetFinders.at(0) == nullptr) {
    m_gotNeighbourPointers = false;
    if (m_verbose) {
      edm::LogWarning("L1GctSetupError") << "L1GctJetFinderBase::setNeighbourJetFinders() : In Jet Finder ID " << m_id
                                         << " first neighbour pointer is set to zero\n";
    }
  }
  if (m_neighbourJetFinders.at(1) == nullptr) {
    m_gotNeighbourPointers = false;
    if (m_verbose) {
      edm::LogWarning("L1GctSetupError") << "L1GctJetFinderBase::setNeighbourJetFinders() : In Jet Finder ID " << m_id
                                         << " second neighbour pointer is set to zero\n";
    }
  }
  if (!m_gotNeighbourPointers && m_verbose) {
    edm::LogError("L1GctSetupError") << "Jet Finder ID " << m_id << " has incorrect assignment of neighbour pointers";
  }
}
 
void L1GctJetFinderBase::setJetFinderParams(const L1GctJetFinderParams* jfpars) {
  m_CenJetSeed = jfpars->getCenJetEtSeedGct();
  m_FwdJetSeed = jfpars->getForJetEtSeedGct();
  m_TauJetSeed = jfpars->getTauJetEtSeedGct();
  m_EtaBoundry = jfpars->getCenForJetEtaBoundary();
  m_tauIsolationThreshold = jfpars->getTauIsoEtThresholdGct();
  m_HttSumJetThreshold = jfpars->getHtJetEtThresholdGct();
  m_HtmSumJetThreshold = jfpars->getMHtJetEtThresholdGct();
  m_gotJetFinderParams = true;
}
 
void L1GctJetFinderBase::setJetEtCalibrationLuts(const L1GctJetFinderBase::lutPtrVector& jfluts) {
  m_jetEtCalLuts = jfluts;
  m_gotJetEtCalLuts = (jfluts.size() >= L1GctJetFinderParams::NUMBER_ETA_VALUES);
}
 
void L1GctJetFinderBase::setEnergySumMasks(const L1GctChannelMask* chmask) {
  bool matchCheckEttAndEtm = true;
  if (chmask != nullptr) {
    static const unsigned N_ETA = L1GctJetFinderParams::NUMBER_ETA_VALUES;
    for (unsigned ieta = 0; ieta < N_ETA; ++ieta) {
      unsigned globalEta = (m_positiveEtaWheel ? N_ETA + ieta : N_ETA - (ieta + 1));
      m_EttMask[ieta] = chmask->totalEtMask(globalEta);
      m_EtmMask[ieta] = chmask->missingEtMask(globalEta);
      m_HttMask[ieta] = chmask->totalHtMask(globalEta);
      m_HtmMask[ieta] = chmask->missingHtMask(globalEta);
 
      matchCheckEttAndEtm &= (m_EttMask[ieta] == m_EtmMask[ieta]);
    }
    if (!matchCheckEttAndEtm)
      edm::LogWarning("L1GctSetupError")
          << "L1GctJetFinderBase::setEnergySumMasks() : In Jet Finder ID " << m_id
          << " setting eta-dependent masks for Et sums: you cannot have different masks for total and missing Et\n";
    m_gotChannelMask = true;
  }
}
 
std::ostream& operator<<(std::ostream& os, const L1GctJetFinderBase& algo) {
  using std::endl;
  os << "ID = " << algo.m_id << endl;
  os << "Calibration lut pointers stored for " << algo.m_jetEtCalLuts.size() << " eta bins" << endl;
  for (unsigned ieta = 0; ieta < algo.m_jetEtCalLuts.size(); ieta++) {
    os << "Eta bin " << ieta << ", JetEtCalibrationLut* = " << algo.m_jetEtCalLuts.at(ieta) << endl;
  }
  os << "No of input regions " << algo.m_inputRegions.size() << endl;
  //   for(unsigned i=0; i < algo.m_inputRegions.size(); ++i)
  //     {
  //       os << algo.m_inputRegions.at(i);
  //     }
  os << "No of output jets " << algo.m_outputJets.size() << endl;
  //   for(unsigned i=0; i < algo.m_outputJets.size(); ++i)
  //     {
  //       os << algo.m_outputJets.at(i);
  //     }
  os << "Output total scalar Et " << algo.m_outputEtSum << endl;
  os << "Output vector Et x component " << algo.m_outputExSum << endl;
  os << "Output vector Et y component " << algo.m_outputEySum << endl;
  os << "Output total scalar Ht " << algo.m_outputHtSum << endl;
  os << "Output vector Ht x component " << algo.m_outputHxSum << endl;
  os << "Output vector Ht y component " << algo.m_outputHySum << endl;
  os << endl;
 
  return os;
}
 
void L1GctJetFinderBase::resetProcessor() {
  m_inputRegions.clear();
  m_inputRegions.resize(this->maxRegionsIn());
  m_outputJets.clear();
  m_outputJets.resize(MAX_JETS_OUT);
  m_sortedJets.clear();
  m_sortedJets.resize(MAX_JETS_OUT);
 
  m_sentProtoJets.clear();
  m_sentProtoJets.resize(MAX_JETS_OUT);
  m_rcvdProtoJets.clear();
  m_rcvdProtoJets.resize(MAX_JETS_OUT);
  m_keptProtoJets.clear();
  m_keptProtoJets.resize(MAX_JETS_OUT);
 
  m_outputEtSum = 0;
  m_outputExSum = 0;
  m_outputEySum = 0;
  m_outputHtSum = 0;
  m_outputHxSum = 0;
  m_outputHySum = 0;
 
  m_outputHfSums.reset();
}
 
void L1GctJetFinderBase::resetPipelines() {
  m_outputJetsPipe.reset(numOfBx());
  m_outputEtSumPipe.reset(numOfBx());
  m_outputExSumPipe.reset(numOfBx());
  m_outputEySumPipe.reset(numOfBx());
  m_outputHtSumPipe.reset(numOfBx());
  m_outputHxSumPipe.reset(numOfBx());
  m_outputHySumPipe.reset(numOfBx());
}
 
void L1GctJetFinderBase::setupObjects() {
  L1GctRegion tempRgn;
  tempRgn.setBx(bxAbs());
  m_inputRegions.assign(this->maxRegionsIn(), tempRgn);
 
  m_sentProtoJets.assign(MAX_JETS_OUT, tempRgn);
  m_rcvdProtoJets.assign(MAX_JETS_OUT, tempRgn);
  m_keptProtoJets.assign(MAX_JETS_OUT, tempRgn);
 
  L1GctJet tempJet;
  tempJet.setBx(bxAbs());
  m_outputJets.assign(MAX_JETS_OUT, tempJet);
}
 
// This is how the regions from the RCT get into the GCT for processing
void L1GctJetFinderBase::setInputRegion(const L1CaloRegion& region) {
  static const unsigned NPHI = L1CaloRegionDetId::N_PHI;
  static const unsigned N_00 = N_EXTRA_REGIONS_ETA00;
  unsigned crate = region.rctCrate();
  // Find the column for this region in a global (eta,phi) array
  // Note the column numbers here are not the same as region->gctPhi()
  // because the RCT crates are not numbered from phi=0.
  unsigned colAbsolute = (crate + 1) * 2 + region.rctPhi();
  unsigned colRelative = ((colAbsolute + NPHI) - m_minColThisJf) % NPHI;
  if (colRelative < this->nCols()) {
    // We are in the right range in phi
    // Now check we are in the right wheel (positive or negative eta)
    if ((crate / N_JF_PER_WHEEL) == (m_id / N_JF_PER_WHEEL)) {
      unsigned i = colRelative * COL_OFFSET + N_00 + region.rctEta();
      m_inputRegions.at(i) = L1GctRegion::makeJfInputRegion(region);
    } else {
      // Accept neighbouring regions from the other wheel
      if (region.rctEta() < N_00) {
        unsigned i = colRelative * COL_OFFSET + N_00 - (region.rctEta() + 1);
        m_inputRegions.at(i) = L1GctRegion::makeJfInputRegion(region);
      }
    }
  }
}
 
std::vector<L1GctInternJetData> L1GctJetFinderBase::getInternalJets() const {
  std::vector<L1GctInternJetData> result;
  for (RawJetVector::const_iterator jet = m_outputJetsPipe.contents.begin(); jet != m_outputJetsPipe.contents.end();
       jet++) {
    result.push_back(L1GctInternJetData::fromEmulator(jet->id(),
                                                      jet->bx(),
                                                      jet->calibratedEt(m_jetEtCalLuts.at(jet->rctEta())),
                                                      jet->overFlow(),
                                                      jet->tauVeto(),
                                                      jet->hwEta(),
                                                      jet->hwPhi(),
                                                      jet->rank(m_jetEtCalLuts.at(jet->rctEta()))));
  }
  return result;
}
 
std::vector<L1GctInternEtSum> L1GctJetFinderBase::getInternalEtSums() const {
  std::vector<L1GctInternEtSum> result;
  for (int bx = 0; bx < numOfBx(); bx++) {
    result.push_back(L1GctInternEtSum::fromEmulatorJetTotEt(m_outputEtSumPipe.contents.at(bx).value(),
                                                            m_outputEtSumPipe.contents.at(bx).overFlow(),
                                                            static_cast<int16_t>(bx - bxMin())));
    result.push_back(L1GctInternEtSum::fromEmulatorJetMissEt(m_outputExSumPipe.contents.at(bx).value(),
                                                             m_outputExSumPipe.contents.at(bx).overFlow(),
                                                             static_cast<int16_t>(bx - bxMin())));
    result.push_back(L1GctInternEtSum::fromEmulatorJetMissEt(m_outputEySumPipe.contents.at(bx).value(),
                                                             m_outputEySumPipe.contents.at(bx).overFlow(),
                                                             static_cast<int16_t>(bx - bxMin())));
    result.push_back(L1GctInternEtSum::fromEmulatorJetTotHt(m_outputHtSumPipe.contents.at(bx).value(),
                                                            m_outputHtSumPipe.contents.at(bx).overFlow(),
                                                            static_cast<int16_t>(bx - bxMin())));
  }
  return result;
}
 
std::vector<L1GctInternHtMiss> L1GctJetFinderBase::getInternalHtMiss() const {
  std::vector<L1GctInternHtMiss> result;
  result.reserve(numOfBx());
  for (int bx = 0; bx < numOfBx(); bx++) {
    result.push_back(L1GctInternHtMiss::emulatorJetMissHt(m_outputHxSumPipe.contents.at(bx).value(),
                                                          m_outputHySumPipe.contents.at(bx).value(),
                                                          m_outputHxSumPipe.contents.at(bx).overFlow(),
                                                          static_cast<int16_t>(bx - bxMin())));
  }
  return result;
}
 
// PROTECTED METHODS BELOW
void L1GctJetFinderBase::fetchProtoJetsFromNeighbour(const fetchType ft) {
  switch (ft) {
    case TOP:
      m_rcvdProtoJets = m_neighbourJetFinders.at(0)->getSentProtoJets();
      break;
    case BOT:
      m_rcvdProtoJets = m_neighbourJetFinders.at(1)->getSentProtoJets();
      break;
    case TOPBOT:
      // Copy half the jets from each neighbour
      static const unsigned int MAX_TOPBOT_JETS = MAX_JETS_OUT / 2;
      unsigned j = 0;
      RegionsVector temp;
      temp = m_neighbourJetFinders.at(0)->getSentProtoJets();
      for (; j < MAX_TOPBOT_JETS; ++j) {
        m_rcvdProtoJets.at(j) = temp.at(j);
      }
      temp = m_neighbourJetFinders.at(1)->getSentProtoJets();
      for (; j < MAX_JETS_OUT; ++j) {
        m_rcvdProtoJets.at(j) = temp.at(j);
      }
      break;
  }
}
 
void L1GctJetFinderBase::sortJets() {
  JetVector tempJets(MAX_JETS_OUT);
  for (unsigned j = 0; j < MAX_JETS_OUT; j++) {
    tempJets.at(j) = m_outputJets.at(j).jetCand(m_jetEtCalLuts);
  }
 
  // Sort the jets
  L1GctJetSorter jSorter(tempJets);
  m_sortedJets = jSorter.getSortedJets();
 
  //store jets in "pipeline memory" for checking
  m_outputJetsPipe.store(m_outputJets, bxRel());
}
 
void L1GctJetFinderBase::doEnergySums() {
  // Refactored energy sums code - find scalar and vector sums
  // of Et and Ht instead of strip stums
  doEtSums();
  doHtSums();
 
  //calculate the Hf tower Et sums and tower-over-threshold counts
  m_outputHfSums = calcHfSums();
 
  return;
}
 
// Calculates scalar and vector sum of Et over input regions
void L1GctJetFinderBase::doEtSums() {
  unsigned et0 = 0;
  unsigned et1 = 0;
  bool of = false;
 
  // Add the Et values from regions  2 to 12 for strip 0,
  //     the Et values from regions 15 to 25 for strip 1.
  unsigned offset = COL_OFFSET * centralCol0();
  unsigned ieta = 0;
  for (UShort i = offset + N_EXTRA_REGIONS_ETA00; i < offset + COL_OFFSET; ++i, ++ieta) {
    if (!m_EttMask[ieta]) {
      et0 += m_inputRegions.at(i).et();
      of |= m_inputRegions.at(i).overFlow();
      et1 += m_inputRegions.at(i + COL_OFFSET).et();
      of |= m_inputRegions.at(i + COL_OFFSET).overFlow();
    }
  }
 
  etTotalType etStrip0(et0);
  etTotalType etStrip1(et1);
  etStrip0.setOverFlow(etStrip0.overFlow() || of);
  etStrip1.setOverFlow(etStrip1.overFlow() || of);
  unsigned xfact0 = (4 * m_id + 6) % 36;
  unsigned xfact1 = (4 * m_id + 8) % 36;
  unsigned yfact0 = (4 * m_id + 15) % 36;
  unsigned yfact1 = (4 * m_id + 17) % 36;
  m_outputEtSum = etStrip0 + etStrip1;
  if (m_outputEtSum.overFlow())
    m_outputEtSum.setValue(etTotalMaxValue);
  m_outputExSum = etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternEtSum::kJetMissEtNBits>(
      etStrip0, xfact0, etStrip1, xfact1);
  m_outputEySum = etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternEtSum::kJetMissEtNBits>(
      etStrip0, yfact0, etStrip1, yfact1);
 
  m_outputEtSumPipe.store(m_outputEtSum, bxRel());
  m_outputExSumPipe.store(m_outputExSum, bxRel());
  m_outputEySumPipe.store(m_outputEySum, bxRel());
}
 
// Calculates scalar and vector sum of Ht over calibrated jets
void L1GctJetFinderBase::doHtSums() {
  unsigned htt = 0;
  unsigned ht0 = 0;
  unsigned ht1 = 0;
  bool of = false;
 
  for (UShort i = 0; i < MAX_JETS_OUT; ++i) {
    // Only sum Ht for valid jets
    if (!m_outputJets.at(i).isNullJet()) {
      unsigned ieta = m_outputJets.at(i).rctEta();
      unsigned htJet = m_outputJets.at(i).calibratedEt(m_jetEtCalLuts.at(ieta));
      // Scalar sum of Htt, with associated threshold
      if (htJet >= m_HttSumJetThreshold && !m_HttMask[ieta]) {
        htt += htJet;
      }
      // Strip sums, for input to Htm calculation, with associated threshold
      if (htJet >= m_HtmSumJetThreshold && !m_HtmMask[ieta]) {
        if (m_outputJets.at(i).rctPhi() == 0) {
          ht0 += htJet;
        }
        if (m_outputJets.at(i).rctPhi() == 1) {
          ht1 += htJet;
        }
        of |= m_outputJets.at(i).overFlow();
      }
    }
  }
 
  etHadType httTotal(htt);
  etHadType htStrip0(ht0);
  etHadType htStrip1(ht1);
  httTotal.setOverFlow(httTotal.overFlow() || of);
  if (httTotal.overFlow())
    httTotal.setValue(htTotalMaxValue);
  htStrip0.setOverFlow(htStrip0.overFlow() || of);
  htStrip1.setOverFlow(htStrip1.overFlow() || of);
  unsigned xfact0 = (4 * m_id + 10) % 36;
  unsigned xfact1 = (4 * m_id + 4) % 36;
  unsigned yfact0 = (4 * m_id + 19) % 36;
  unsigned yfact1 = (4 * m_id + 13) % 36;
  m_outputHtSum = httTotal;
  m_outputHxSum = etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternHtMiss::kJetMissHtNBits>(
      htStrip0, xfact0, htStrip1, xfact1);
  m_outputHySum = etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternHtMiss::kJetMissHtNBits>(
      htStrip0, yfact0, htStrip1, yfact1);
 
  // Common overflow for Ht components
  bool htmOverFlow = m_outputHxSum.overFlow() || m_outputHySum.overFlow();
  m_outputHxSum.setOverFlow(htmOverFlow);
  m_outputHySum.setOverFlow(htmOverFlow);
 
  m_outputHtSumPipe.store(m_outputHtSum, bxRel());
  m_outputHxSumPipe.store(m_outputHxSum, bxRel());
  m_outputHySumPipe.store(m_outputHySum, bxRel());
}
 
// Calculates Hf inner rings Et sum, and counts number of "fineGrain" bits set
L1GctJetFinderBase::hfTowerSumsType L1GctJetFinderBase::calcHfSums() const {
  static const UShort NUMBER_OF_FRWRD_RINGS = 4;
  static const UShort NUMBER_OF_INNER_RINGS = 2;
  std::vector<unsigned> et(NUMBER_OF_INNER_RINGS, 0);
  std::vector<bool> of(NUMBER_OF_INNER_RINGS, false);
  std::vector<unsigned> nt(NUMBER_OF_INNER_RINGS, 0);
 
  UShort offset = COL_OFFSET * (centralCol0() + 1);
  for (UShort i = 0; i < NUMBER_OF_FRWRD_RINGS; ++i) {
    offset--;
 
    // Sum HF Et and count jets above threshold over "inner rings"
    if (i < NUMBER_OF_INNER_RINGS) {
      et.at(i) += m_inputRegions.at(offset).et();
      of.at(i) = of.at(i) || m_inputRegions.at(offset).overFlow();
 
      et.at(i) += m_inputRegions.at(offset + COL_OFFSET).et();
      of.at(i) = of.at(i) || m_inputRegions.at(offset + COL_OFFSET).overFlow();
 
      if (m_inputRegions.at(offset).fineGrain())
        nt.at(i)++;
      if (m_inputRegions.at(offset + COL_OFFSET).fineGrain())
        nt.at(i)++;
    }
  }
  hfTowerSumsType temp(et.at(0), et.at(1), nt.at(0), nt.at(1));
  temp.etSum0.setOverFlow(temp.etSum0.overFlow() || of.at(0));
  temp.etSum1.setOverFlow(temp.etSum1.overFlow() || of.at(1));
  return temp;
}
 
// Here is where the rotations are actually done
// Procedure suitable for implementation in hardware, using
// integer multiplication and bit shifting operations
 
template <int kBitsInput, int kBitsOutput>
L1GctTwosComplement<kBitsOutput> L1GctJetFinderBase::etComponentForJetFinder(
    const L1GctUnsignedInt<kBitsInput>& etStrip0,
    const unsigned& fact0,
    const L1GctUnsignedInt<kBitsInput>& etStrip1,
    const unsigned& fact1) {
  // typedefs and constants
  typedef L1GctTwosComplement<kBitsOutput> OutputType;
 
  // The sin(phi), cos(phi) factors are represented in 15 bits,
  // as numbers in the range -2^14 to 2^14.
  // We multiply each input strip Et by the required factor
  // then shift, to divide by 2^13. This gives an extra bit
  // of precision on the LSB of the output values.
  // It's important to avoid systematically biasing the Ex, Ey
  // component values because this results in an asymmetric
  // distribution in phi for the final MEt.
  // The extra LSB is required because one of the factors is 0.5.
  // Applying this factor without the extra LSB corrects odd values
  // systematically down by 0.5; or all values by 0.25
  // on average, giving a shift of -2 units in Ex.
 
  static const int internalComponentSize = 15;
  static const int maxEt = 1 << internalComponentSize;
 
  static const int kBitsFactor = internalComponentSize + kBitsInput + 1;
  static const int maxFactor = 1 << kBitsFactor;
 
  static const int bitsToShift = internalComponentSize - 2;
  static const int halfInputLsb = 1 << (bitsToShift - 1);
 
  // These factors correspond to the sine of angles from -90 degrees to
  // 90 degrees in 10 degree steps, multiplied by 16383 and written
  // as a <kBitsFactor>-bit 2s-complement number.
  const int factors[19] = {maxFactor - 16383,
                           maxFactor - 16134,
                           maxFactor - 15395,
                           maxFactor - 14188,
                           maxFactor - 12550,
                           maxFactor - 10531,
                           maxFactor - 8192,
                           maxFactor - 5603,
                           maxFactor - 2845,
                           0,
                           2845,
                           5603,
                           8192,
                           10531,
                           12550,
                           14188,
                           15395,
                           16134,
                           16383};
 
  int rotatedValue0, rotatedValue1, myFact;
  int etComponentSum = 0;
 
  if (fact0 >= 36 || fact1 >= 36) {
    if (m_verbose) {
      edm::LogError("L1GctProcessingError") << "L1GctJetLeafCard::rotateEtValue() has been called with factor numbers "
                                            << fact0 << " and " << fact1 << "; should be less than 36 \n";
    }
  } else {
    // First strip - choose the required multiplication factor
    if (fact0 > 18) {
      myFact = factors[(36 - fact0)];
    } else {
      myFact = factors[fact0];
    }
 
    // Multiply the Et value by the factor.
    rotatedValue0 = static_cast<int>(etStrip0.value()) * myFact;
 
    // Second strip - choose the required multiplication factor
    if (fact1 > 18) {
      myFact = factors[(36 - fact1)];
    } else {
      myFact = factors[fact1];
    }
 
    // Multiply the Et value by the factor.
    rotatedValue1 = static_cast<int>(etStrip1.value()) * myFact;
 
    // Add the two scaled values together, with full resolution including
    // fractional parts from the sin(phi), cos(phi) scaling.
    // Adjust the value to avoid truncation errors since these
    // accumulate and cause problems for the missing Et measurement.
    // Then discard the 13 LSB and interpret the result as
    // a 15-bit twos complement integer.
    etComponentSum = ((rotatedValue0 + rotatedValue1) + halfInputLsb) >> bitsToShift;
 
    etComponentSum = etComponentSum & (maxEt - 1);
    if (etComponentSum >= (maxEt / 2)) {
      etComponentSum = etComponentSum - maxEt;
    }
  }
 
  // Store as a TwosComplement format integer and return
  OutputType temp(etComponentSum);
  temp.setOverFlow(temp.overFlow() || etStrip0.overFlow() || etStrip1.overFlow());
  return temp;
}
 
// Declare the specific versions we want to use, to help the linker out
// One for the MET components
template L1GctJetFinderBase::etCompInternJfType
L1GctJetFinderBase::etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternEtSum::kJetMissEtNBits>(
    const L1GctJetFinderBase::etTotalType&, const unsigned&, const L1GctJetFinderBase::etTotalType&, const unsigned&);
 
// One for the MHT components
template L1GctJetFinderBase::htCompInternJfType
L1GctJetFinderBase::etComponentForJetFinder<L1GctInternEtSum::kTotEtOrHtNBits, L1GctInternHtMiss::kJetMissHtNBits>(
    const L1GctJetFinderBase::etTotalType&, const unsigned&, const L1GctJetFinderBase::etTotalType&, const unsigned&);