AnalyticalErrorPropagation.h File Reference

#include "FWCore/Utilities/interface/Visibility.h"
#include "TrackingTools/AnalyticalJacobians/interface/AnalyticalCurvilinearJacobian.h"
#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryState/interface/SurfaceSideDefinition.h"

Go to the source code of this file.

Functions
std::pair< TrajectoryStateOnSurface, double >	analyticalErrorPropagation (const FreeTrajectoryState &startingState, const Surface &surface, SurfaceSideDefinition::SurfaceSide side, const GlobalTrajectoryParameters &destParameters, const double &s)

Function Documentation

std::pair<TrajectoryStateOnSurface,double> analyticalErrorPropagation ( const FreeTrajectoryState &  startingState, const Surface &  surface, SurfaceSideDefinition::SurfaceSide  side, const GlobalTrajectoryParameters &  destParameters, const double &  s  )

inline

Definition at line 15 of file AnalyticalErrorPropagation.h.

References FreeTrajectoryState::curvilinearError(), FreeTrajectoryState::hasError(), AnalyticalCurvilinearJacobian::jacobian(), CurvilinearTrajectoryError::matrix(), GlobalTrajectoryParameters::momentum(), FreeTrajectoryState::parameters(), GlobalTrajectoryParameters::position(), alignCSCRings::s, and unlikely.

Referenced by RKPropagatorInS::propagateWithPath().

                         {
    if unlikely(!startingState.hasError()) 
       // return state without errors
      return std::pair<TrajectoryStateOnSurface,double>(TrajectoryStateOnSurface(destParameters,surface,side),s);

    //
    // compute jacobian
    //

    // FIXME: Compute mean B field between startingState and destParameters and pass it to analyticalJacobian
    //GlobalPoint xStart = startingState.position();
    //GlobalPoint xDest = destParameters.position();
    //GlobalVector h1  = destParameters.magneticFieldInInverseGeV(xStart);
    //GlobalVector h2  = destParameters.magneticFieldInInverseGeV(xDest);
    //GlobalVector h = 0.5*(h1+h2);
    //LogDebug("RungeKutta") << "AnalyticalErrorPropagation: The Fields are: " << h1 << ", " << h2 << ", " << h ; 
    
    // 
    AnalyticalCurvilinearJacobian analyticalJacobian(startingState.parameters(), 
                             destParameters.position(), 
                             destParameters.momentum(), s);
    auto const & jacobian = analyticalJacobian.jacobian();
    return std::pair<TrajectoryStateOnSurface,double>(
              TrajectoryStateOnSurface(destParameters,
                                        ROOT::Math::Similarity(jacobian, startingState.curvilinearError().matrix()),
                                        surface,side),
              s);
}