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nmohr |
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#ifndef TOPMASSRECO_H
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#define TOPMASSRECO_H
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#include <cmath>
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#include <vector>
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#include "VHbbAnalysis/VHbbDataFormats/interface/VHbbCandidate.h"
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struct topHypo {
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TLorentzVector p4;
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TLorentzVector p4W;
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} topQuark;
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struct topMassReco {
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topHypo operator()(const VHbbCandidate vhCand) const {
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//Look for additional jet that is most b-tagged
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topQuark.p4 = TLorentzVector(0,0,0,0);
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topQuark.p4W = TLorentzVector(0,0,0,0);
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int topJet=-99;
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double minBtag=-9999.;
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for(unsigned int j=0; j < vhCand.additionalJets.size(); j++ ){
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if (vhCand.additionalJets[j].csv > minBtag) topJet = j;
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}
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if(topJet < 0) return topQuark; //If no additional jet, do no computation
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const TLorentzVector bJet = vhCand.additionalJets[topJet].p4;
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const TLorentzVector met = vhCand.V.mets.at(0).p4;
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// just support semiletonic top
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if( vhCand.candidateType == VHbbCandidate::Zee || vhCand.candidateType == VHbbCandidate::Zmumu || vhCand.candidateType == VHbbCandidate::Znn ) return topQuark;
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else if( vhCand.candidateType == VHbbCandidate::Wmun ){
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const double leptonMass = 0.105;
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const TLorentzVector lepton = vhCand.V.muons[0].p4;
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return calcMass(lepton,bJet,met,leptonMass);
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}
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else if( vhCand.candidateType == VHbbCandidate::Wen ){
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const double leptonMass = 0.005;
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const TLorentzVector lepton = vhCand.V.electrons[0].p4;
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return calcMass(lepton,bJet,met,leptonMass);
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}
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else return topQuark;
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}
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static topHypo calcMass(const TLorentzVector lepton, const TLorentzVector bJet,const TLorentzVector met, const double leptonMass){
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const double mW = 80.4;
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double pzNu=0;
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//Did not recalculate any formulas, but seems to check the neutrino solutions to get met z component
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const double a = mW*mW - leptonMass*leptonMass + 2.0*lepton.Px()*met.Px()+2.0*lepton.Py()*met.Py();
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const double A = 4.0*(lepton.E()*lepton.E() - lepton.Pz()*lepton.Pz());
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const double B = -4.0*a*lepton.Pz();
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const double C = 4.0*lepton.E()*lepton.E()*(met.Px()*met.Px()+met.Py()*met.Py()) - a*a;
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const double tmpRoot = B*B - 4.0*A*C;
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if (tmpRoot<0) pzNu = - B/(2*A);
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else{
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const double tmpSol1 = (-B + TMath::Sqrt(tmpRoot))/(2.0*A);
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const double tmpSol2 = (-B - TMath::Sqrt(tmpRoot))/(2.0*A);
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if (fabs(tmpSol2-lepton.Pz()) < fabs(tmpSol1-lepton.Pz())){
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pzNu = tmpSol2;
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}
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else pzNu = tmpSol1;
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}
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const double nuE = TMath::Sqrt(met.Px()*met.Px()+met.Py()*met.Py()+pzNu*pzNu);
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//new met vector
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TLorentzVector metHyp = TLorentzVector(met.Px(),met.Py(),pzNu,nuE);
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//W = lepton+met
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topQuark.p4W = (lepton+metHyp);
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//Top = lepton+jet+met
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topQuark.p4 = (lepton+bJet+metHyp);
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return topQuark;
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}
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};
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#endif
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