CkfPattern/interface/TransientInitialStateEstimator.h

0001 #ifndef TransientInitialStateEstimator_H
0002 #define TransientInitialStateEstimator_H
0003
0004 #include "FWCore/Framework/interface/ConsumesCollector.h"
0005 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0006
0007 #include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
0008 #include "RecoTracker/TransientTrackingRecHit/interface/TkClonerImpl.h"
0009
0010 #include <utility>
0011
0012 class Propagator;
0013 class GeomDet;
0014 class Trajectory;
0015 class TrackingComponentsRecord;
0016 namespace edm {
0017   class EventSetup;
0018 }
0019
0020 /// Computes the trajectory state to be used as a starting state for the track fit
0021 /// from the vector of hits. The parameters of this state are close to the final fit parameters.
0022 /// The error matrix is enlarged in order not to bias the track fit.
0023
0024 class TransientInitialStateEstimator {
0025 public:
0026   typedef TrajectoryStateOnSurface TSOS;
0027
0028   TransientInitialStateEstimator(const edm::ParameterSet& conf, edm::ConsumesCollector iC);
0029   void setEventSetup(const edm::EventSetup& es, const TkClonerImpl& hc);
0030
0031   std::pair<TrajectoryStateOnSurface, const GeomDet*> innerState(const Trajectory& traj, bool doBackFit = true) const;
0032
0033 private:
0034   const edm::ESGetToken<Propagator, TrackingComponentsRecord> thePropagatorAlongToken;
0035   const edm::ESGetToken<Propagator, TrackingComponentsRecord> thePropagatorOppositeToken;
0036   const Propagator* thePropagatorAlong;
0037   const Propagator* thePropagatorOpposite;  // not used? can we remove it?
0038   TkClonerImpl theHitCloner;
0039   const int theNumberMeasurementsForFit;
0040 };
0041
0042 #endif