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amagnan |
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#include "UserCode/HbbAnalysis/interface/Objects.hh"
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namespace HbbAnalysis {
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double DeltaPhi(const double phi1, const double phi2)
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{
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double dPhi = phi1 - phi2;
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if (dPhi<0) dPhi += 2*TMath::Pi();
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return dPhi;
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}
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double DeltaR(const BaseVars & v1, const BaseVars & v2)
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{
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double dEta = v1.eta - v2.eta;
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double dPhi = v1.phi - v2.phi;
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if (dPhi<0) dPhi += 2*TMath::Pi();
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return sqrt(dEta*dEta+dPhi*dPhi);
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}
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double SameSign(const BaseVars & v1, const BaseVars & v2)
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{
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return v1.charge == v2.charge;
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}
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double OppSign(const BaseVars & v1, const BaseVars & v2)
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{
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return (v1.charge != v2.charge &&
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v1.charge != 0 &&
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v2.charge != 0);
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}
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TLorentzVector FourMomentum(const BaseVars & v, const double scale)
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{
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double lpx = v.pT*cos(v.phi);
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double lpy = v.pT*sin(v.phi);
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//double lp = v.pT/sin(2*atan(exp(-v.eta)));
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//double lpz = sqrt(lp*lp - v.pT*v.pT);
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double lpz = v.pT*sinh(v.eta);
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double lE = v.pT*cosh(v.eta);//v.E
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return TLorentzVector(lpx/scale,lpy/scale,lpz/scale,lE/scale);
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}
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double TransverseMass(const BaseVars & leg1,
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const BaseVars & leg2,
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const double mEx,
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const double mEy)
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{
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double px = leg1.pT*cos(leg1.phi) + leg2.pT*cos(leg2.phi) + mEx;
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double py = leg1.pT*sin(leg1.phi) + leg2.pT*sin(leg2.phi) + mEy;
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double et = leg1.pT + leg2.pT + TMath::Sqrt(mEx*mEx + mEy*mEy);
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double mt2 = et*et - (px*px + py*py);
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if ( mt2 < 0 ) {
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std::cout << " --- WARNING : mt2 = " << mt2 << " is negative... Set to 0.";
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return 0.;
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}
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return sqrt(mt2);
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}
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double TransverseMass(const BaseVars & leg1,
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const double mEx,
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const double mEy)
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{
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double px = leg1.pT*cos(leg1.phi) + mEx;
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double py = leg1.pT*sin(leg1.phi) + mEy;
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double et = leg1.pT + TMath::Sqrt(mEx*mEx + mEy*mEy);
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double mt = et*et - (px*px + py*py);
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if ( mt < 0 ) {
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std::cout << " --- WARNING : mt = " << mt << " is negative... Set to 0.";
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return 0.;
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}
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return sqrt(mt);
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}
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TLorentzVector FourMomentumCDFmethod(const BaseVars & leg1,
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const BaseVars & leg2,
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double mEx,
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double mEy)
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{
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double lpx = leg1.pT*cos(leg1.phi) + leg2.pT*cos(leg2.phi) + mEx;
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double lpy = leg1.pT*sin(leg1.phi) + leg2.pT*sin(leg2.phi) + mEy;
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double lpz = leg1.pT*sinh(leg1.eta) + leg2.pT*sinh(leg2.eta);
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double le = leg1.pT*cosh(leg1.eta) + leg2.pT*cosh(leg2.eta) + TMath::Sqrt(mEx*mEx + mEy*mEy);
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return TLorentzVector(lpx, lpy, lpz, le);
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}
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TLorentzVector FourMomentumCollinearApprox(const BaseVars & leg1,
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const BaseVars & leg2,
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double mEx,
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double mEy)
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{
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double px1 = leg1.pT*cos(leg1.phi);
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double px2 = leg2.pT*cos(leg2.phi);
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double py1 = leg1.pT*sin(leg1.phi);
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double py2 = leg2.pT*sin(leg2.phi);
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double x1_numerator = px1*py2 - px2*py1;
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double x1_denominator = py2*(px1 + mEx) - px2*(py1 + mEy);
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double x1 = ( x1_denominator != 0. ) ? x1_numerator/x1_denominator : -1.;
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double x2_numerator = x1_numerator;
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double x2_denominator = px1*(py2 + mEy) - py1*(px2 + mEx);
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double x2 = ( x2_denominator != 0. ) ? x2_numerator/x2_denominator : -1.;
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if ( (x1 > 0. && x1 < 1.) &&
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(x2 > 0. && x2 < 1.) ) {
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TLorentzVector p4 = FourMomentum(leg1,1/x1) + FourMomentum(leg2,1/x2);
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return p4;
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} else {
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return TLorentzVector(0,0,0,0);
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}
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}
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}//namespace
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