| 1 |
paus |
1.1 |
#include "MitEdm/VertexFitInterface/interface/MvfInterface.h"
|
| 2 |
|
|
|
| 3 |
|
|
using namespace reco;
|
| 4 |
|
|
using namespace mitedm;
|
| 5 |
|
|
|
| 6 |
|
|
const int cms2GenMap[5] = { 1, 0, 4, 3, 2 }; // parameter map: transfer CMS to generic coordinates
|
| 7 |
|
|
|
| 8 |
|
|
MvfInterface::MvfInterface(MultiVertexFitter *fitter) :
|
| 9 |
|
|
_mvf (fitter),
|
| 10 |
|
|
_fCurv0(0.5 * 0.0029979),
|
| 11 |
|
|
_fCurv (_fCurv0 * fitter->bField())
|
| 12 |
|
|
{
|
| 13 |
|
|
}
|
| 14 |
|
|
|
| 15 |
|
|
bool MvfInterface::addTrack(const reco::Track* trk, const int id, const float mass,
|
| 16 |
|
|
MultiVertexFitter::vertexNumber jv)
|
| 17 |
|
|
{
|
| 18 |
|
|
// Fill the parameters and matrix compliant with the generic fitter this involves remapping and a
|
| 19 |
|
|
// simple parameter transformation
|
| 20 |
|
|
HepVector params(5); // track parameters
|
| 21 |
|
|
HepSymMatrix covmat(5,0); // 5x5 matrix filled with 0
|
| 22 |
|
|
double fcCosTheta = _fCurv * cos(trk->theta());
|
| 23 |
|
|
double fcCosThetaSq = fcCosTheta * fcCosTheta;
|
| 24 |
|
|
|
| 25 |
|
|
// double loop to fill covariance matrix
|
| 26 |
|
|
for (int i=0; i<5; i++) {
|
| 27 |
|
|
params[i] = trk->parameter(cms2GenMap[i]);
|
| 28 |
|
|
|
| 29 |
|
|
// apply q/p correction
|
| 30 |
|
|
if (i == 1)
|
| 31 |
|
|
params[i] = params[i] * fcCosTheta;
|
| 32 |
|
|
|
| 33 |
|
|
for (int j=i; j<5; j++) {
|
| 34 |
|
|
covmat[i][j] = trk->covariance(cms2GenMap[i],cms2GenMap[j]);
|
| 35 |
|
|
|
| 36 |
|
|
// apply q/p correction
|
| 37 |
|
|
if (1 == 1 && j == 1)
|
| 38 |
|
|
covmat[i][j] = covmat[i][j] * fcCosThetaSq;
|
| 39 |
|
|
else if (i == 1 || j == 1)
|
| 40 |
|
|
covmat[i][j] = covmat[i][j] * fcCosTheta;
|
| 41 |
|
|
|
| 42 |
|
|
// force symmetry (should not be needed but well, better apply)
|
| 43 |
|
|
if (i != j)
|
| 44 |
|
|
covmat[j][i] = covmat[i][j];
|
| 45 |
|
|
}
|
| 46 |
|
|
}
|
| 47 |
|
|
|
| 48 |
|
|
return (_mvf->addTrack(params,covmat,id,mass,jv));
|
| 49 |
|
|
}
|
