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khahn |
1.2 |
#include <iostream>
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khahn |
1.1 |
#include "Angles.h"
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khahn |
1.2 |
#include "EventData.h"
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dkralph |
1.4 |
void fillAngles(Angles &a,
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TLorentzVector lep1, int lep1_q,
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TLorentzVector lep2, int lep2_q,
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TLorentzVector lep3, int lep3_q,
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TLorentzVector lep4, int lep4_q
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) {
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LabVectors l;
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| 14 |
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if( lep1_q > 0 ) {
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l.vecl1p = lep1;
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l.vecl1m = lep2;
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} else {
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l.vecl1p = lep2;
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l.vecl1m = lep1;
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}
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| 22 |
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if( lep3_q > 0 ) {
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l.vecl2p = lep3;
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l.vecl2m = lep4;
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} else {
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l.vecl2p = lep4;
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l.vecl2m = lep3;
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}
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l.vecz1 = (l.vecl1p+l.vecl1m);
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l.vecz2 = (l.vecl2p+l.vecl2m);
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l.vec4l = (l.vecz1+l.vecz2);
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getAngles( l, a );
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}
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khahn |
1.2 |
void fillAngles( EventData &data, Angles &a ) {
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LabVectors l;
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if( data.Z1leptons[0].charge > 0 ) {
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khahn |
1.3 |
l.vecl1p = data.Z1leptons[0].vec;
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l.vecl1m = data.Z1leptons[1].vec;
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khahn |
1.2 |
} else {
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khahn |
1.3 |
l.vecl1p = data.Z1leptons[1].vec;
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l.vecl1m = data.Z1leptons[0].vec;
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khahn |
1.2 |
}
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if( data.Z2leptons[0].charge > 0 ) {
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khahn |
1.3 |
l.vecl2p = data.Z2leptons[0].vec;
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l.vecl2m = data.Z2leptons[1].vec;
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khahn |
1.2 |
} else {
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khahn |
1.3 |
l.vecl2p = data.Z2leptons[1].vec;
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l.vecl2m = data.Z2leptons[0].vec;
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khahn |
1.2 |
}
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l.vecz1 = (l.vecl1p+l.vecl1m);
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l.vecz2 = (l.vecl2p+l.vecl2m);
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l.vec4l = (l.vecz1+l.vecz2);
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getAngles( l, a );
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}
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khahn |
1.1 |
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void getAngles( LabVectors &l,
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Angles &a ) {
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dkralph |
1.4 |
// cout << "ANGLES z1: " << setw(12) << l.vecz1.Pt() << setw(12) << l.vecz1.Eta() << setw(12) << l.vecz1.Phi() << endl;
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// cout << "ANGLES z2: " << setw(12) << l.vecz2.Pt() << setw(12) << l.vecz2.Eta() << setw(12) << l.vecz2.Phi() << endl;
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// cout << "ANGLES 4l: " << setw(12) << l.vec4l.Pt() << setw(12) << l.vec4l.Eta() << setw(12) << l.vec4l.Phi() << endl;
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// cout << "ANGLES l1p:" << setw(12) << l.vecl1p.Pt() << setw(12) << l.vecl1p.Eta() << setw(12) << l.vecl1p.Phi() << endl;
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// cout << "ANGLES l1m:" << setw(12) << l.vecl1m.Pt() << setw(12) << l.vecl1m.Eta() << setw(12) << l.vecl1m.Phi() << endl;
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// cout << "ANGLES l2p:" << setw(12) << l.vecl2p.Pt() << setw(12) << l.vecl2p.Eta() << setw(12) << l.vecl2p.Phi() << endl;
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// cout << "ANGLES l2m:" << setw(12) << l.vecl2m.Pt() << setw(12) << l.vecl2m.Eta() << setw(12) << l.vecl2m.Phi() << endl;
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khahn |
1.1 |
//
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// define the frames
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// --------------------------------------------------------------------------------------------------
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TVector3 Xframe = l.vec4l.BoostVector();
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TVector3 Z1frame = l.vecz1.BoostVector();
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TVector3 Z2frame = l.vecz2.BoostVector();
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//
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// costheta(l1m,X) in Z1 frame
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// --------------------------------------------------------------------------------------------------
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TLorentzVector vecl1m_in_Z1frame( l.vecl1m ); // make a copies of the vectors
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TLorentzVector vec4l_in_Z1frame( l.vec4l ); //
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vecl1m_in_Z1frame.Boost( -1*Z1frame ); // now go to the Z1 rest frame
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vec4l_in_Z1frame.Boost( -1*Z1frame ); //
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a.costheta1
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= vecl1m_in_Z1frame.Vect().Dot(-1*vec4l_in_Z1frame.Vect()) /
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(vecl1m_in_Z1frame.Vect().Mag()*vec4l_in_Z1frame.Vect().Mag());
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//
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// costheta(l3,X) in Z2 frame
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// --------------------------------------------------------------------------------------------------
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TLorentzVector vecl2m_in_Z2frame( l.vecl2m ); // make copies of the vectors
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TLorentzVector vec4l_in_Z2frame( l.vec4l ); //
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vecl2m_in_Z2frame.Boost( -1*Z2frame ); // now go to the Z2 rest frame
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vec4l_in_Z2frame.Boost( -1*Z2frame );
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a.costheta2 =
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vecl2m_in_Z2frame.Vect().Dot(-1*vec4l_in_Z2frame.Vect()) /
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(vecl2m_in_Z2frame.Vect().Mag()*vec4l_in_Z2frame.Vect().Mag());
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//
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// Phi(Z1,Z2) in X frame
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// --------------------------------------------------------------------------------------------------
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// this is essentially what they do and it reproduces their numbers,
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// it's the angle between l1 and the z2 decay plane in the Z1 frame
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TLorentzVector vecz2_in_Z1frame( l.vecz2 ); //
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TLorentzVector vecl2m_in_Z1frame( l.vecl2m ); //
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TLorentzVector vecl2p_in_Z1frame( l.vecl2p ); //
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vecz2_in_Z1frame.Boost( -1*Z1frame ); //
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vecl2m_in_Z1frame.Boost( -1*Z1frame ); //
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vecl2p_in_Z1frame.Boost( -1*Z1frame ); //
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//
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// define the Z2 coordinate system in the Z1 frame
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// x : opposite the Z2 dir, lies in the Z2 decay plane
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| 119 |
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// z : orthogonal to the Z2 decay plane
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// y : orthogonal to x&z, lies in the Z2 decay plane
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TVector3 nnewX = ( -1*vecz2_in_Z1frame.Vect()).Unit();
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TVector3 nnewZ = (vecl2m_in_Z1frame.Vect().Cross(vecl2p_in_Z1frame.Vect())).Unit();
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TVector3 nnewY = nnewZ.Cross(nnewX).Unit();
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TRotation rotation2;
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rotation2 = (rotation2.RotateAxes( nnewX, nnewY, nnewZ )).Inverse();
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TVector3 vecl1m_in_Z2coords_Z1frame = vecl1m_in_Z1frame.Vect().Transform(rotation2);
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| 128 |
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//
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// axes are redfined so that Phi is the angle between the Z1 orthogonal
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// and the Z2 decay plane as given by y
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//
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TRotation rotation3;
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TVector3 nnnewX( 0,1,0 );
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TVector3 nnnewY( 0,0,1 );
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TVector3 nnnewZ( 1,0,0 );
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rotation3 = (rotation3.RotateAxes( nnnewX, nnnewY, nnnewZ )).Inverse();
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TVector3 vecl1m_in_Z2coords_redefined_Z1frame = vecl1m_in_Z2coords_Z1frame.Transform(rotation3);
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a.Phi = vecl1m_in_Z2coords_redefined_Z1frame.Phi();
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| 140 |
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//
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// rather, I'd expect something like this ...
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//
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TLorentzVector vecl1p_in_Xframe( l.vecl1p ); // make a copies of the vectors
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TLorentzVector vecl1m_in_Xframe( l.vecl1m ); //
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TLorentzVector vecl2p_in_Xframe( l.vecl2p ); //
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TLorentzVector vecl2m_in_Xframe( l.vecl2m ); //
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vecl1p_in_Xframe.Boost( -1*Xframe ); // go to the X rest frame
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vecl1m_in_Xframe.Boost( -1*Xframe ); //
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vecl2p_in_Xframe.Boost( -1*Xframe ); //
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vecl2m_in_Xframe.Boost( -1*Xframe ); //
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/*
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// sanity check ...
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TLorentzVector z1inX = vecl1p_in_Xframe+vecl1m_in_Xframe;
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| 157 |
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TLorentzVector z2inX = vecl2p_in_Xframe+vecl2m_in_Xframe;
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| 158 |
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float dotz1z2 = z1inX.Vect().Dot(z2inX.Vect()) / (z1inX.Vect().Mag()*z2inX.Vect().Mag());
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std::cout << "dotz1z2: " << dotz1z2 << std::endl;
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*/
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TVector3 Z1ortho_in_Xframe = // define the decay planes via the orthogonals
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vecl1m_in_Xframe.Vect().Cross(vecl1p_in_Xframe.Vect());
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TVector3 Z2ortho_in_Xframe =
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vecl2m_in_Xframe.Vect().Cross(vecl2p_in_Xframe.Vect());
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/*
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| 168 |
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// sanity check ... why are these small but not exactly zero ???
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float z1odot = Z1ortho_in_Xframe.Dot(z1inX.Vect())/(Z1ortho_in_Xframe.Mag()*z1inX.Vect().Mag());
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| 170 |
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float z2odot = Z2ortho_in_Xframe.Dot(z2inX.Vect())/(Z2ortho_in_Xframe.Mag()*z2inX.Vect().Mag());
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| 171 |
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float l1podot = Z1ortho_in_Xframe.Dot(vecl1p_in_Xframe.Vect())/(Z1ortho_in_Xframe.Mag()*vecl1p_in_Xframe.Vect().Mag());
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| 172 |
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float l1modot = Z1ortho_in_Xframe.Dot(vecl1m_in_Xframe.Vect())/(Z1ortho_in_Xframe.Mag()*vecl1m_in_Xframe.Vect().Mag());
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| 173 |
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std::cout << "Z1ortho_in_Xframe.Dot(z1inX): " << z1odot << "\t"
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| 174 |
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<< "Z2ortho_in_Xframe.Dot(z2inX): " << z2odot << "\t"
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<< "Z1ortho_in_Xframe.Dot(veclp1_in_Xframe) : " << l1podot << "\t"
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<< "Z1ortho_in_Xframe.Dot(veclm1_in_Xframe) : " << l1modot << "\t"
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<< std::endl;
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*/
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| 179 |
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| 180 |
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| 181 |
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// a.Phi = Z1ortho_in_Xframe.DeltaPhi(Z2ortho_in_Xframe);
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//a.Phi = Z1ortho_in_Xframe.Angle(Z2ortho_in_Xframe);
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| 185 |
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| 186 |
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//
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| 187 |
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// costheta*(Z1,pp) in X frame
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| 188 |
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// --------------------------------------------------------------------------------------------------
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| 189 |
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TLorentzVector vecz1_in_Xframe( l.vecz1 ); // make a copies of the vectors
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| 190 |
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TLorentzVector vecpp_in_Xframe( 0., 0., 1., 0. ); // define pp axis
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| 191 |
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| 192 |
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vecz1_in_Xframe.Boost( -1*Xframe ); // go to the X rest frame
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| 193 |
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vecpp_in_Xframe.Boost( -1*Xframe ); //
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| 194 |
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| 195 |
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a.costhetastar =
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| 196 |
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vecz1_in_Xframe.Vect().Dot(vecpp_in_Xframe.Vect()) /
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| 197 |
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(vecz1_in_Xframe.Vect().Mag()*vecpp_in_Xframe.Vect().Mag());
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| 198 |
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| 199 |
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| 200 |
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//
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| 201 |
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// Phi1(Z1,pp) in X frame
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| 202 |
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// --------------------------------------------------------------------------------------------------
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| 203 |
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| 204 |
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// define the Z1 decay plane in the Xframe
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| 205 |
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// y: orthogonal to the Z1 decay plane
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| 206 |
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// x: lies in the Z1 decay plane, but orthogonal to Z1
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| 207 |
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// z: z1 in Xframe
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| 208 |
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TVector3 newY = (vecl1p_in_Xframe.Vect().Unit().Cross(vecl1m_in_Xframe.Vect().Unit())).Unit();
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| 209 |
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TVector3 newX = (newY.Cross(vecz1_in_Xframe.Vect().Unit())).Unit();
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| 210 |
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TVector3 newZ( (vecz1_in_Xframe.Vect()).Unit() );
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| 211 |
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| 212 |
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TRotation rotation;
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| 213 |
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rotation = (rotation.RotateAxes( newX, newY, newZ )).Inverse();
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| 214 |
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TVector3 vecpp( 0., 0., 1. );
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| 215 |
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TVector3 vecpp_in_Z1coords_Xframe = vecpp.Transform(rotation);
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| 216 |
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a.Phi1 = vecpp_in_Z1coords_Xframe.Phi();
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| 217 |
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| 218 |
khahn |
1.2 |
// a.mz1 = (l.vecl1m+l.vecl1p).M();
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| 219 |
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// a.mz2 = (l.vecl2m+l.vecl2p).M();
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| 220 |
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// a.m4l = (l.vec4l).M();
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| 221 |
khahn |
1.1 |
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| 222 |
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};
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| 223 |
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| 224 |
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| 225 |
dkralph |
1.4 |
void computeMelaAngles(TLorentzVector p4M11, int Z1_lept1Id,
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| 226 |
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TLorentzVector p4M12, int Z1_lept2Id,
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| 227 |
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TLorentzVector p4M21, int Z2_lept1Id,
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| 228 |
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TLorentzVector p4M22, int Z2_lept2Id,
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| 229 |
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float& costhetastar,
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| 230 |
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float& costheta1,
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| 231 |
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float& costheta2,
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| 232 |
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float& Phi,
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| 233 |
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float& Phi1){
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| 234 |
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| 235 |
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//build Z 4-vectors
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| 236 |
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TLorentzVector p4Z1 = p4M11 + p4M12;
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| 237 |
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TLorentzVector p4Z2 = p4M21 + p4M22;
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| 238 |
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| 239 |
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// Sort Z1 leptons so that:
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| 240 |
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if ( (Z1_lept1Id*Z1_lept2Id<0 && Z1_lept1Id<0) || // for OS pairs: lep1 must be the negative one
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| 241 |
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(Z1_lept1Id*Z1_lept2Id>0 && p4M11.Phi()<=p4M12.Phi()) //for SS pairs: use random deterministic convention
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| 242 |
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) {
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| 243 |
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swap(p4M11, p4M12);
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| 244 |
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}
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| 245 |
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| 246 |
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// Same for Z2 leptons
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| 247 |
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if ( (Z2_lept1Id*Z2_lept2Id<0 && Z2_lept1Id<0) ||
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| 248 |
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(Z2_lept1Id*Z2_lept2Id>0 && p4M21.Phi()<=p4M22.Phi())
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| 249 |
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) {
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| 250 |
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swap(p4M21, p4M22);
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| 251 |
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}
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| 252 |
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| 253 |
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| 254 |
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//build H 4-vectors
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| 255 |
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TLorentzVector p4H = p4Z1 + p4Z2;
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| 256 |
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| 257 |
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// -----------------------------------
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| 258 |
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| 259 |
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//// costhetastar
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| 260 |
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TVector3 boostX = -(p4H.BoostVector());
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| 261 |
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TLorentzVector thep4Z1inXFrame( p4Z1 );
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| 262 |
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TLorentzVector thep4Z2inXFrame( p4Z2 );
|
| 263 |
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thep4Z1inXFrame.Boost( boostX );
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| 264 |
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thep4Z2inXFrame.Boost( boostX );
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| 265 |
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TVector3 theZ1X_p3 = TVector3( thep4Z1inXFrame.X(), thep4Z1inXFrame.Y(), thep4Z1inXFrame.Z() );
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| 266 |
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TVector3 theZ2X_p3 = TVector3( thep4Z2inXFrame.X(), thep4Z2inXFrame.Y(), thep4Z2inXFrame.Z() );
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| 267 |
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costhetastar = theZ1X_p3.CosTheta();
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| 268 |
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| 269 |
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//// --------------------------- costheta1
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| 270 |
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TVector3 boostV1 = -(p4Z1.BoostVector());
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| 271 |
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TLorentzVector p4M11_BV1( p4M11 );
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| 272 |
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TLorentzVector p4M12_BV1( p4M12 );
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| 273 |
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TLorentzVector p4M21_BV1( p4M21 );
|
| 274 |
|
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TLorentzVector p4M22_BV1( p4M22 );
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| 275 |
|
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p4M11_BV1.Boost( boostV1 );
|
| 276 |
|
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p4M12_BV1.Boost( boostV1 );
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| 277 |
|
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p4M21_BV1.Boost( boostV1 );
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| 278 |
|
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p4M22_BV1.Boost( boostV1 );
|
| 279 |
|
|
|
| 280 |
|
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TLorentzVector p4V2_BV1 = p4M21_BV1 + p4M22_BV1;
|
| 281 |
|
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//// costheta1
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| 282 |
|
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costheta1 = -p4V2_BV1.Vect().Dot( p4M11_BV1.Vect() )/p4V2_BV1.Vect().Mag()/p4M11_BV1.Vect().Mag();
|
| 283 |
|
|
|
| 284 |
|
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//// --------------------------- costheta2
|
| 285 |
|
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TVector3 boostV2 = -(p4Z2.BoostVector());
|
| 286 |
|
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TLorentzVector p4M11_BV2( p4M11 );
|
| 287 |
|
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TLorentzVector p4M12_BV2( p4M12 );
|
| 288 |
|
|
TLorentzVector p4M21_BV2( p4M21 );
|
| 289 |
|
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TLorentzVector p4M22_BV2( p4M22 );
|
| 290 |
|
|
p4M11_BV2.Boost( boostV2 );
|
| 291 |
|
|
p4M12_BV2.Boost( boostV2 );
|
| 292 |
|
|
p4M21_BV2.Boost( boostV2 );
|
| 293 |
|
|
p4M22_BV2.Boost( boostV2 );
|
| 294 |
|
|
|
| 295 |
|
|
TLorentzVector p4V1_BV2 = p4M11_BV2 + p4M12_BV2;
|
| 296 |
|
|
//// costheta2
|
| 297 |
|
|
costheta2 = -p4V1_BV2.Vect().Dot( p4M21_BV2.Vect() )/p4V1_BV2.Vect().Mag()/p4M21_BV2.Vect().Mag();
|
| 298 |
|
|
|
| 299 |
|
|
//// --------------------------- Phi and Phi1 (old phistar1 - azimuthal production angle)
|
| 300 |
|
|
// TVector3 boostX = -(thep4H.BoostVector());
|
| 301 |
|
|
TLorentzVector p4M11_BX( p4M11 );
|
| 302 |
|
|
TLorentzVector p4M12_BX( p4M12 );
|
| 303 |
|
|
TLorentzVector p4M21_BX( p4M21 );
|
| 304 |
|
|
TLorentzVector p4M22_BX( p4M22 );
|
| 305 |
|
|
|
| 306 |
|
|
p4M11_BX.Boost( boostX );
|
| 307 |
|
|
p4M12_BX.Boost( boostX );
|
| 308 |
|
|
p4M21_BX.Boost( boostX );
|
| 309 |
|
|
p4M22_BX.Boost( boostX );
|
| 310 |
|
|
|
| 311 |
|
|
TVector3 tmp1 = p4M11_BX.Vect().Cross( p4M12_BX.Vect() );
|
| 312 |
|
|
TVector3 tmp2 = p4M21_BX.Vect().Cross( p4M22_BX.Vect() );
|
| 313 |
|
|
|
| 314 |
|
|
TVector3 normal1_BX( tmp1.X()/tmp1.Mag(), tmp1.Y()/tmp1.Mag(), tmp1.Z()/tmp1.Mag() );
|
| 315 |
|
|
TVector3 normal2_BX( tmp2.X()/tmp2.Mag(), tmp2.Y()/tmp2.Mag(), tmp2.Z()/tmp2.Mag() );
|
| 316 |
|
|
|
| 317 |
|
|
//// Phi
|
| 318 |
|
|
TLorentzVector p4Z1_BX = p4M11_BX + p4M12_BX;
|
| 319 |
|
|
float tmpSgnPhi = p4Z1_BX.Vect().Dot( normal1_BX.Cross( normal2_BX) );
|
| 320 |
|
|
float sgnPhi = tmpSgnPhi/fabs(tmpSgnPhi);
|
| 321 |
|
|
Phi = sgnPhi * acos( -1.*normal1_BX.Dot( normal2_BX) );
|
| 322 |
|
|
|
| 323 |
|
|
|
| 324 |
|
|
//////////////
|
| 325 |
|
|
|
| 326 |
|
|
TVector3 beamAxis(0,0,1);
|
| 327 |
|
|
TVector3 tmp3 = (p4M11_BX + p4M12_BX).Vect();
|
| 328 |
|
|
|
| 329 |
|
|
TVector3 p3V1_BX( tmp3.X()/tmp3.Mag(), tmp3.Y()/tmp3.Mag(), tmp3.Z()/tmp3.Mag() );
|
| 330 |
|
|
TVector3 tmp4 = beamAxis.Cross( p3V1_BX );
|
| 331 |
|
|
TVector3 normalSC_BX( tmp4.X()/tmp4.Mag(), tmp4.Y()/tmp4.Mag(), tmp4.Z()/tmp4.Mag() );
|
| 332 |
|
|
|
| 333 |
|
|
//// Phi1
|
| 334 |
|
|
float tmpSgnPhi1 = p4Z1_BX.Vect().Dot( normal1_BX.Cross( normalSC_BX) );
|
| 335 |
|
|
float sgnPhi1 = tmpSgnPhi1/fabs(tmpSgnPhi1);
|
| 336 |
|
|
Phi1 = sgnPhi1 * acos( normal1_BX.Dot( normalSC_BX) );
|
| 337 |
|
|
|
| 338 |
|
|
}
|
| 339 |
|
|
|
| 340 |
|
|
//----------------------------------------------------------------------------------------
|
| 341 |
|
|
void Angles::dump()
|
| 342 |
|
|
{
|
| 343 |
|
|
cout << "angles: "
|
| 344 |
|
|
<< setw(12) << costheta1 << setw(12) << costheta2 << setw(12) << Phi
|
| 345 |
|
|
<< setw(12) << costhetastar << setw(12) << Phi1
|
| 346 |
|
|
<< endl;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
