CMS 3D CMS Logo

LocalTrajectoryParameters Class Reference

Class providing access to a set of relevant parameters of a trajectory in a local, Cartesian frame. More...

#include <DataFormats/TrajectoryState/interface/LocalTrajectoryParameters.h>

List of all members.

Public Member Functions

TrackCharge charge () const
 Charge (-1, 0 or 1).
 LocalTrajectoryParameters (const LocalPoint &pos, const LocalVector &p, TrackCharge charge)
 Constructor from local position, momentum and charge.
 LocalTrajectoryParameters (double aQbp, double aDxdz, double aDydz, double aX, double aY, double aPzSign, bool charged=true)
 Constructor from individual parameters.
 LocalTrajectoryParameters (const AlgebraicVector5 &v, double aPzSign, bool charged=true)
 Constructor from vector of parameters.
 LocalTrajectoryParameters (const AlgebraicVector &v, double aPzSign, bool charged=true)
 Constructor from vector of parameters.
 LocalTrajectoryParameters ()
AlgebraicVector5 mixedFormatVector () const
 Vector of parameters in internal representation.
AlgebraicVector mixedFormatVector_old () const
 Vector of parameters in internal representation.
LocalVector momentum () const
 Momentum vector in the local frame.
LocalPoint position () const
 Local x and y position coordinates.
double pzSign () const
 Sign of the z-component of the momentum in the local frame.
double signedInverseMomentum () const
 Signed inverse momentum q/p (zero for neutrals).
bool updateP (double dP)
 Update of momentum by a scalar dP.
AlgebraicVector5 vector () const
 Vector of parameters with signed inverse momentum.
AlgebraicVector vector_old () const
 Vector of parameters with signed inverse momentum.

Private Attributes

TrackCharge theCharge
 charge
double theDxdz
 tangent of direction in local x vs. z
double theDydz
 tangent of direction in local y vs. z
double thePzSign
 sign of local pz
double theQbp
 q/p (charged) or 1/p (neutral)
double theX
 local x position
double theY
 local y position

Detailed Description

Class providing access to a set of relevant parameters of a trajectory in a local, Cartesian frame.

The set consists of the following parameters:

q/p : charged particles: charge (plus or minus one) divided by magnitude of momentum
neutral particles: inverse magnitude of momentum
dxdz : direction tangent in local xz-plane
dydz : direction tangent in local yz-plane
x : local x-coordinate
y : local y-coordinate

In addition, the sign of local p_z is needed to fully define the direction of the track in this local frame.

Definition at line 26 of file LocalTrajectoryParameters.h.

Constructor & Destructor Documentation

LocalTrajectoryParameters::LocalTrajectoryParameters (  )  [inline]

Definition at line 30 of file LocalTrajectoryParameters.h.

00030 {}

LocalTrajectoryParameters::LocalTrajectoryParameters ( const AlgebraicVector &  v,
double  aPzSign,
bool  charged = true 
) [inline]

Constructor from vector of parameters.

Expects a vector of parameters as defined above, plus the sign of p_z. For charged particles the charge will be determined by the sign of the first element. For neutral particles the last argument should be false, in which case the charge of the first element will be neglected.

Definition at line 39 of file LocalTrajectoryParameters.h.

References theCharge, theDxdz, theDydz, thePzSign, theQbp, theX, and theY.

00039                                                                                            {
00040     theQbp  = v[0];
00041     theDxdz = v[1];
00042     theDydz = v[2];
00043     theX    = v[3];
00044     theY    = v[4];
00045     thePzSign = aPzSign;
00046     if ( charged )
00047       theCharge = theQbp>0 ? 1 : -1;
00048     else
00049       theCharge = 0;
00050   }

LocalTrajectoryParameters::LocalTrajectoryParameters ( const AlgebraicVector5 &  v,
double  aPzSign,
bool  charged = true 
) [inline]

Constructor from vector of parameters.

Expects a vector of parameters as defined above, plus the sign of p_z. For charged particles the charge will be determined by the sign of the first element. For neutral particles the last argument should be false, in which case the charge of the first element will be neglected.

Definition at line 59 of file LocalTrajectoryParameters.h.

References theCharge, theDxdz, theDydz, thePzSign, theQbp, theX, and theY.

00059                                                                                             {
00060     theQbp  = v[0];
00061     theDxdz = v[1];
00062     theDydz = v[2];
00063     theX    = v[3];
00064     theY    = v[4];
00065     thePzSign = aPzSign;
00066     if ( charged )
00067       theCharge = theQbp>0 ? 1 : -1;
00068     else
00069       theCharge = 0;
00070   }

LocalTrajectoryParameters::LocalTrajectoryParameters ( double  aQbp,
double  aDxdz,
double  aDydz,
double  aX,
double  aY,
double  aPzSign,
bool  charged = true 
) [inline]

Constructor from individual parameters.

Expects parameters as defined above, plus the sign of p_z. For charged particles the charge will be determined by the sign of the first argument. For neutral particles the last argument should be false, in which case the charge of the first argument will be neglected.

Definition at line 80 of file LocalTrajectoryParameters.h.

References theCharge, and theQbp.

00081                                                                                        :
00082     theDxdz(aDxdz), theDydz(aDydz),
00083     theX(aX), theY(aY), thePzSign(aPzSign) {
00084     if ( charged ) {
00085       theQbp = aQbp;
00086       theCharge = theQbp>0 ? 1 : -1;
00087     }
00088     else {
00089       theQbp = aQbp;
00090       theCharge = 0;
00091     }
00092   }

LocalTrajectoryParameters::LocalTrajectoryParameters ( const LocalPoint &  pos,
const LocalVector &  p,
TrackCharge  charge 
) [inline]

Constructor from local position, momentum and charge.

Definition at line 95 of file LocalTrajectoryParameters.h.

References PV3DBase< T, PVType, FrameType >::mag(), and theQbp.

00096                                                  :
00097     theQbp( charge/p.mag()), theDxdz( p.x()/p.z()), theDydz( p.y()/p.z()), 
00098     theX( pos.x()), theY(pos.y()), thePzSign( p.z()>0. ? 1.:-1.), theCharge(charge) {
00099     if ( charge==0 )  theQbp = 1./p.mag();
00100   }

Member Function Documentation

TrackCharge LocalTrajectoryParameters::charge (  )  const [inline]

Charge (-1, 0 or 1).

Definition at line 120 of file LocalTrajectoryParameters.h.

References theCharge.

Referenced by HLTMuonDQMSource::analyze(), BzeroReferenceTrajectory::BzeroReferenceTrajectory(), BasicSingleTrajectoryState::checkGlobalParameters(), reco::ElectronPixelSeed::getCharge(), JacobianCartesianToLocal::JacobianCartesianToLocal(), JacobianLocalToCartesian::JacobianLocalToCartesian(), operator<<(), signedInverseMomentum(), and InOutConversionTrackFinder::tracks().

00120 {return theCharge;}

AlgebraicVector5 LocalTrajectoryParameters::mixedFormatVector (  )  const [inline]

Vector of parameters in internal representation.

Vector of parameters as defined above, with the first element = q/p for charged and = 1/p for neutral.

Definition at line 162 of file LocalTrajectoryParameters.h.

References theDxdz, theDydz, theQbp, theX, theY, and v.

Referenced by BzeroReferenceTrajectory::BzeroReferenceTrajectory(), DualReferenceTrajectory::extractParameters(), DualBzeroReferenceTrajectory::extractParameters(), JacobianLocalToCartesian::JacobianLocalToCartesian(), KarimakiAlignmentDerivatives::operator()(), operator<<(), and ReferenceTrajectory::ReferenceTrajectory().

00162                                              {
00163     AlgebraicVector5 v;
00164     v[0] = theQbp;    // signed in case of charged particles, 1/p for neutrals
00165     v[1] = theDxdz;
00166     v[2] = theDydz;
00167     v[3] = theX;
00168     v[4] = theY;
00169     return v;
00170   }

AlgebraicVector LocalTrajectoryParameters::mixedFormatVector_old (  )  const [inline]

Vector of parameters in internal representation.

Vector of parameters as defined above, with the first element = q/p for charged and = 1/p for neutral.

Definition at line 177 of file LocalTrajectoryParameters.h.

References theDxdz, theDydz, theQbp, theX, theY, and v.

00177                                                 {
00178     AlgebraicVector v(5);
00179     v[0] = theQbp;    // signed in case of charged particles, 1/p for neutrals
00180     v[1] = theDxdz;
00181     v[2] = theDydz;
00182     v[3] = theX;
00183     v[4] = theY;
00184     return v;
00185   }

LocalVector LocalTrajectoryParameters::momentum (  )  const [inline]

Momentum vector in the local frame.

Definition at line 110 of file LocalTrajectoryParameters.h.

References p, funct::sqrt(), theDxdz, theDydz, thePzSign, and theQbp.

Referenced by HLTMuonDQMSource::analyze(), BasicSingleTrajectoryState::checkGlobalParameters(), PixelCPEBase::computeAnglesFromTrajectory(), TwoBodyDecayTrajectory::constructSingleTsosWithErrors(), IsGoodSeed(), JacobianCartesianToLocal::JacobianCartesianToLocal(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), BasicSingleTrajectoryState::localMomentum(), StripCPEfromTrackAngle2::localParameters(), StripCPEfromTrackAngle::localParameters(), reco::TrackInfo::localTrackMomentum(), TrackCandidateProducer::produce(), TrackInfoProducerAlgorithm::run(), and InOutConversionTrackFinder::tracks().

00110                                {
00111     double p = 1./fabs(theQbp);
00112     if ( p>1.e9 )  p = 1.e9;
00113     double dz = thePzSign/sqrt(1. + theDxdz*theDxdz + theDydz*theDydz);
00114     double dx = dz*theDxdz;
00115     double dy = dz*theDydz;
00116     return LocalVector(dx*p, dy*p, dz*p);
00117   }

LocalPoint LocalTrajectoryParameters::position (  )  const [inline]

Local x and y position coordinates.

Definition at line 105 of file LocalTrajectoryParameters.h.

References theX, and theY.

Referenced by BasicSingleTrajectoryState::checkGlobalParameters(), PixelCPEBase::computeAnglesFromTrajectory(), OutInConversionSeedFinder::createSeed(), IsGoodSeed(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), StripCPEfromTrackAngle2::localParameters(), StripCPEfromTrackAngle::localParameters(), BasicSingleTrajectoryState::localPosition(), reco::TrackInfo::localTrackPosition(), TrackInfoProducerAlgorithm::run(), and InOutConversionTrackFinder::tracks().

00105                               {
00106     return LocalPoint(theX, theY);
00107   }

double LocalTrajectoryParameters::pzSign (  )  const [inline]

Sign of the z-component of the momentum in the local frame.

Definition at line 188 of file LocalTrajectoryParameters.h.

References thePzSign.

Referenced by BzeroReferenceTrajectory::BzeroReferenceTrajectory(), TrajectoryStateCombiner::combine(), JacobianLocalToCartesian::JacobianLocalToCartesian(), GsfTrackProducerBase::putInEvt(), GaussianStateConversions::tsosFromMultiGaussianState(), KFStripUpdator::update(), and KFStrip1DUpdator::update().

00188                         {
00189     return thePzSign;
00190   }

double LocalTrajectoryParameters::signedInverseMomentum (  )  const [inline]

Signed inverse momentum q/p (zero for neutrals).

Definition at line 123 of file LocalTrajectoryParameters.h.

References charge(), and theQbp.

Referenced by ReferenceTrajectory::construct(), TwoBodyDecayTrajectory::constructSingleTsosWithErrors(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), NuclearInteractionFinder::rescaleError(), vector(), and vector_old().

00123                                        {
00124     return charge()==0 ? 0. : theQbp;
00125   }

bool LocalTrajectoryParameters::updateP ( double  dP  )  [inline]

Update of momentum by a scalar dP.

Definition at line 193 of file LocalTrajectoryParameters.h.

References p, and theQbp.

Referenced by MaterialEffectsUpdator::updateState(), VolumeMaterialEffectsUpdator::updateState(), and GsfMaterialEffectsUpdator::updateState().

00193                           {
00194     double p = 1./fabs(theQbp);
00195     if ((p += dP) <= 0.) return false;
00196     double newQbp = theQbp > 0. ? 1./p : -1./p;
00197     theQbp = newQbp;
00198     return true;
00199   }

AlgebraicVector5 LocalTrajectoryParameters::vector (  )  const [inline]

Vector of parameters with signed inverse momentum.

Vector of parameters as defined above, with the first element = q/p .

Definition at line 147 of file LocalTrajectoryParameters.h.

References signedInverseMomentum(), theDxdz, theDydz, theX, theY, and v.

Referenced by TrajectoryStateCombiner::combine(), PFGsfHelper::computeQpMode(), Chi2MeasurementEstimatorForTrackerHits::estimate(), CollinearFitAtTM::fit(), GlobalMuonTrackMatcher::match_Chi2(), MeasurementExtractor::measuredParameters(), PFGsfHelper::PFGsfHelper(), TrackAssociatorByPosition::quality(), ChargeSignificanceTrajectoryFilter::TBC(), CkfDebugger::testSeed(), Strip1DMeasurementTransformator::trajectoryParameters(), and StripMeasurementTransformator::trajectoryParameters().

00147                                   {
00148     AlgebraicVector5 v;
00149     v[0] = signedInverseMomentum();
00150     v[1] = theDxdz;
00151     v[2] = theDydz;
00152     v[3] = theX;
00153     v[4] = theY;
00154     return v;
00155   }

AlgebraicVector LocalTrajectoryParameters::vector_old (  )  const [inline]

Vector of parameters with signed inverse momentum.

Vector of parameters as defined above, with the first element = q/p .

Definition at line 132 of file LocalTrajectoryParameters.h.

References signedInverseMomentum(), theDxdz, theDydz, theX, theY, and v.

00132                                      {
00133     AlgebraicVector v(5);
00134     v[0] = signedInverseMomentum();
00135     v[1] = theDxdz;
00136     v[2] = theDydz;
00137     v[3] = theX;
00138     v[4] = theY;
00139     return v;
00140   }

Member Data Documentation

TrackCharge LocalTrajectoryParameters::theCharge [private]

charge

Definition at line 210 of file LocalTrajectoryParameters.h.

Referenced by charge(), and LocalTrajectoryParameters().

double LocalTrajectoryParameters::theDxdz [private]

tangent of direction in local x vs. z

Definition at line 203 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), mixedFormatVector_old(), momentum(), vector(), and vector_old().

double LocalTrajectoryParameters::theDydz [private]

tangent of direction in local y vs. z

Definition at line 204 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), mixedFormatVector_old(), momentum(), vector(), and vector_old().

double LocalTrajectoryParameters::thePzSign [private]

sign of local pz

Definition at line 208 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), momentum(), and pzSign().

double LocalTrajectoryParameters::theQbp [private]

q/p (charged) or 1/p (neutral)

Definition at line 202 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), mixedFormatVector_old(), momentum(), signedInverseMomentum(), and updateP().

double LocalTrajectoryParameters::theX [private]

local x position

Definition at line 205 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), mixedFormatVector_old(), position(), vector(), and vector_old().

double LocalTrajectoryParameters::theY [private]

local y position

Definition at line 206 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), mixedFormatVector_old(), position(), vector(), and vector_old().

The documentation for this class was generated from the following file:
Generated on Tue Jun 9 18:27:55 2009 for CMSSW by  doxygen 1.5.4