| 1 |
#include "PhysicsTools/IsolationUtils/interface/PropagateToCal.h"
|
| 2 |
|
| 3 |
PropagateToCal::PropagateToCal(double radius, double minZ, double maxZ, bool theIgnoreMaterial)
|
| 4 |
{
|
| 5 |
radius_ = radius;
|
| 6 |
maxZ_ = maxZ;
|
| 7 |
minZ_ = minZ;
|
| 8 |
theIgnoreMaterial_ = theIgnoreMaterial;
|
| 9 |
if (maxZ_ < minZ_ || radius < 0.0)
|
| 10 |
throw cms::Exception("BadConfig") << "PropagateToCal: CalMaxZ ("
|
| 11 |
<< maxZ_
|
| 12 |
<< ") smaller than CalMinZ ("
|
| 13 |
<< minZ_ << ") or invalid radius ("
|
| 14 |
<< radius_ << ").";
|
| 15 |
}
|
| 16 |
|
| 17 |
|
| 18 |
PropagateToCal::~PropagateToCal()
|
| 19 |
{
|
| 20 |
}
|
| 21 |
|
| 22 |
|
| 23 |
bool PropagateToCal::propagate(const GlobalPoint& vertex,
|
| 24 |
GlobalVector& Cand, int charge, const MagneticField * field) const
|
| 25 |
{
|
| 26 |
///the code is inspired by Gero's CosmicGenFilterHelix class:
|
| 27 |
bool result = true;
|
| 28 |
typedef std::pair<TrajectoryStateOnSurface, double> TsosPath;
|
| 29 |
|
| 30 |
SteppingHelixPropagator propagator(field); // should we somehow take it from ESetup???
|
| 31 |
propagator.setMaterialMode(theIgnoreMaterial_); // no material effects if set to true
|
| 32 |
propagator.setNoErrorPropagation(true);
|
| 33 |
|
| 34 |
const FreeTrajectoryState fts(GlobalTrajectoryParameters(vertex, Cand, charge, field));
|
| 35 |
const Surface::RotationType dummyRot;
|
| 36 |
|
| 37 |
/// target cylinder, around z-axis
|
| 38 |
Cylinder::ConstCylinderPointer theTargetCylinder =
|
| 39 |
Cylinder::build(Surface::PositionType(0.,0.,0.), dummyRot, radius_);
|
| 40 |
|
| 41 |
/// plane closing cylinder at 'negative' side
|
| 42 |
Plane::ConstPlanePointer theTargetPlaneMin =
|
| 43 |
Plane::build(Surface::PositionType(0.,0.,minZ_), dummyRot);
|
| 44 |
|
| 45 |
/// plane closing cylinder at 'positive' side
|
| 46 |
Plane::ConstPlanePointer theTargetPlaneMax =
|
| 47 |
Plane::build(Surface::PositionType(0.,0.,maxZ_), dummyRot);
|
| 48 |
|
| 49 |
TsosPath aTsosPath(propagator.propagateWithPath(fts, *theTargetCylinder));
|
| 50 |
if (!aTsosPath.first.isValid()) {
|
| 51 |
result = false;
|
| 52 |
} else if (aTsosPath.first.globalPosition().z() < theTargetPlaneMin->position().z()) {
|
| 53 |
// If on cylinder, but outside minimum z, try minimum z-plane:
|
| 54 |
// (Would it be possible to miss rdius on plane, but reach cylinder afterwards in z-range?
|
| 55 |
// No, at least not in B-field parallel to z-axis which is cylinder axis.)
|
| 56 |
aTsosPath = propagator.propagateWithPath(fts, *theTargetPlaneMin);
|
| 57 |
if (!aTsosPath.first.isValid()
|
| 58 |
|| aTsosPath.first.globalPosition().perp() > theTargetCylinder->radius()) {
|
| 59 |
result = false;
|
| 60 |
}
|
| 61 |
} else if (aTsosPath.first.globalPosition().z() > theTargetPlaneMax->position().z()) {
|
| 62 |
// Analog for outside maximum z:
|
| 63 |
aTsosPath = propagator.propagateWithPath(fts, *theTargetPlaneMax);
|
| 64 |
if (!aTsosPath.first.isValid()
|
| 65 |
|| aTsosPath.first.globalPosition().perp() > theTargetCylinder->radius()) {
|
| 66 |
result = false;
|
| 67 |
}
|
| 68 |
}
|
| 69 |
///The result is the vector connecting the extrapolation endPoint on the Calorimeter surface and
|
| 70 |
///the origin of the coordinate system, point (0,0,0).
|
| 71 |
if (result) {
|
| 72 |
Cand = GlobalVector(aTsosPath.first.globalPosition().x(),
|
| 73 |
aTsosPath.first.globalPosition().y(),
|
| 74 |
aTsosPath.first.globalPosition().z() );
|
| 75 |
}
|
| 76 |
return result;///Successfully propagated to the calorimeter or not
|
| 77 |
}
|
