// D0 RedMET with CMG trees
double getD0RedMet(double lpx1, double lpy1, double lpterr1,
double lpx2, double lpy2, double lpterr2,
double sumjpx, double sumjpy,
double pfmet, double pfmetphi,
int flav, int pickAFlav = 1) {
if( flav==3 ) {
if( pickAFlav!=1 && pickAFlav!=2 ) {
cout << " *** ERROR *** " << endl;
cout << " You need to pick a flavor in getD0RedMet(...)! " << endl;
throw std::exception();
return -1.;
}
else {
flav = pickAFlav;
}
}
// double wPerpMu = 1.0;
// double wRecMu = 2.0;
// double wUncMu = 2.5;
double wPerpMu = 1.0;
double wRecMu = 1.5;
double wUncMu = 2.75;
// double wPerpEl = 1.5;
// double wRecEl = 2.25;
// double wUncEl = 0.0;
double wPerpEl = 0.75;
double wRecEl = 1.0;
double wUncEl = 0.25;
int seplep = 1;
if (seplep == 0){
wPerpMu = 1.0;
wRecMu = 1.25;
wUncMu = 0.0;
wPerpEl = wPerpMu;
wRecEl = wRecMu;
wUncEl = wUncMu;
}
double kPerp = 1.;
double kRecoil_l = 1.;
double kRecoil_t = 1.;
double kSigmaPt_l = 1.;
double kSigmaPt_t = 1.;
if( flav==1 ) { // mm
kPerp = wPerpMu;
kRecoil_l = kRecoil_t = wRecMu;
kSigmaPt_l = kSigmaPt_t = wUncMu;
}
else if( flav==2 ) { // ee
kPerp = wPerpEl;
kRecoil_l = kRecoil_t = wRecEl;
kSigmaPt_l = kSigmaPt_t = wUncEl;
}
else {}
double pt1 = sqrt(lpx1*lpx1 + lpy1*lpy1);
double pt2 = sqrt(lpx2*lpx2 + lpy2*lpy2);
TVector2 lead, subl;
double leadpt, sublpt, leadpterr, sublpterr;
if(pt1>pt2) {
lead = TVector2(lpx1, lpy1);
subl = TVector2(lpx2, lpy2);
leadpt = pt1;
leadpterr = lpterr1;
sublpt = pt2;
sublpterr = lpterr2;
}
else {
lead = TVector2(lpx2, lpy2);
subl = TVector2(lpx1, lpy1);
leadpt = pt2;
leadpterr = lpterr2;
sublpt = pt1;
sublpterr = lpterr1;
}
// Define the thrust and dilepton
TVector2 dil = lead+subl;
TVector2 thr = lead-subl;
TVector2 longi;
TVector2 perpe;
double deltaPhi = fabs(lead.DeltaPhi(subl));
if( deltaPhi>(3.141592654/2.) ) {
longi = thr.Unit();
perpe = longi.Rotate(3.141592654/2.);
if(perpe*lead<0) perpe *= -1;
}
else {
perpe = dil.Unit();
longi = perpe.Rotate(3.141592654/2.);
if(longi*lead<0) longi *= -1;
}
// Dilepton
double dileptProj_l = dil*longi;
double dileptProj_t = dil*perpe;
// Unclustered
TVector2 uncl( pfmet*cos(pfmetphi), pfmet*sin(pfmetphi) );
uncl += dil;
double unclProj_l = uncl*longi;
double unclProj_t = uncl*perpe;
// Sum of jets
TVector2 sumjVec(sumjpx, sumjpy);
double sumjetProj_l = sumjVec*longi;
double sumjetProj_t = sumjVec*perpe;
// Recoil
double recoilProj_l = min( sumjetProj_l, -1.0*unclProj_l ); recoilProj_l = min( 0., recoilProj_l );
double recoilProj_t = min( sumjetProj_t, -1.0*unclProj_t ); recoilProj_t = min( 0., recoilProj_t );
// Case with 0 jets
// double recoilProj_l = -1.0*unclProj_l; recoilProj_l = min( 0., recoilProj_l );
// double recoilProj_t = -1.0*unclProj_t; recoilProj_t = min( 0., recoilProj_t );
// Lepton uncertainty
double relErrLead = min( leadpterr/leadpt, 1. );
double relErrSubl = min( sublpterr/sublpt, 1. );
TVector2 lowLead = lead*(1.0-relErrLead);
TVector2 lowSubl = subl*(1.0-relErrSubl);
TVector2 lowDil = lowLead + lowSubl;
TVector2 lowThr = lowLead - lowSubl;
double deltaDileptProj_t = lowDil*perpe - dileptProj_t;
double deltaDileptProj_l = ( -relErrLead*lead + relErrSubl*subl )*longi;
double redMET_l = max( (dileptProj_l + kRecoil_l*recoilProj_l + kSigmaPt_l*deltaDileptProj_l), 0.);
double redMET_t = max( (dileptProj_t + kRecoil_t*recoilProj_t + kSigmaPt_t*deltaDileptProj_t), 0.);
double redMET = sqrt( pow(redMET_l,2) + kPerp*pow(redMET_t,2) );
return redMET;
}
void PMCSZCand::SetA(PMCSEMObj &elec1, PMCSEMObj &elec2) {
// First we need to calculate the thrust axis
//
TVector2 e1(elec1.ppx(),elec1.ppy());
TVector2 e2(elec2.ppx(),elec2.ppy());
// Calculate the two phi angles
double phi1=e1.Phi();
double phi2=e2.Phi();
// Order in phi
if (phi1<phi2) {
TVector2 dummy=e1;
e1=e2;
e2=dummy;
double dummy2=phi1;
phi1=phi2;
phi2=dummy2;
}
// Calculate lengths as well
double len1=e1.Mod();
double len2=e2.Mod();
// Good old Newton
//
// initial guess
TVector2 bisector=(e1.Unit()+e2.Unit()).Unit();
double alpha=bisector.Phi()-TMath::Pi()/2.;
double alphaBackup=alpha;
int nIt=0;
// iterate
double oldAlpha=9999.;
while (fabs(alpha-oldAlpha)>0.000001) {
oldAlpha=alpha;
double f=len2*sin(phi2-oldAlpha)+len1*sin(oldAlpha-phi1);
double fp=-len2*cos(phi2-oldAlpha)+len1*cos(oldAlpha-phi1);
alpha=oldAlpha-f/fp;
nIt++;
if (nIt>1000) {
cout<<"Newton did not converge in search for thrust axis"<<endl;
alpha=alphaBackup;
break;
}
}
// Build unit vector
TVector2 r;
r.SetMagPhi(1.,alpha);
TVector2 rPerp=r.Rotate(TMath::Pi()/2.);
// Checks
if (fabs(e1*rPerp-e2*rPerp)>0.001) {
cout<<"Looks like Newton was imprecise in calculation of thrust axis: "<<e1*rPerp<<" "<<e2*rPerp<<endl;
}
// now we can do the projections
TVector2 Z=e1+e2;
_pat=Z*rPerp;
_pal=Z*r;
}