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ClusterUtils Class Reference
Packages » analysis

Class to provide momentum-related information from ECLClusters. More...

#include <ClusterUtils.h>

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Public Member Functions

 ClusterUtils ()
 Constructor.
 
const ROOT::Math::PxPyPzEVector GetCluster4MomentumFromCluster (const ECLCluster *cluster, ECLCluster::EHypothesisBit hypo)
 Returns cluster four momentum vector. More...
 
const ROOT::Math::PxPyPzEVector Get4MomentumFromCluster (const ECLCluster *cluster, ECLCluster::EHypothesisBit hypo)
 Returns four momentum vector. More...
 
const ROOT::Math::PxPyPzEVector Get4MomentumFromCluster (const ECLCluster *cluster, const ROOT::Math::XYZVector &vertex, ECLCluster::EHypothesisBit hypo)
 Returns four momentum vector. More...
 
const TMatrixD GetJacobiMatrix4x6FromCluster (const ECLCluster *cluster, ECLCluster::EHypothesisBit hypo)
 Returns 4x6 Jacobi matrix (px, py, pz, E) More...
 
const TMatrixD GetJacobiMatrix4x6FromCluster (const ECLCluster *cluster, const ROOT::Math::XYZVector &vertex, ECLCluster::EHypothesisBit hypo)
 Returns 4x6 Jacobi matrix (px, py, pz, E) More...
 
const TMatrixDSym GetCovarianceMatrix3x3FromCluster (const ECLCluster *cluster)
 Returns 3x3 covariance matrix (E, theta, phi) More...
 
const TMatrixDSym GetCovarianceMatrix4x4FromCluster (const ECLCluster *cluster, const TMatrixD &jacobiMatrix)
 Returns 4x4 covariance matrix (px, py, pz, E) More...
 
const TMatrixDSym GetCovarianceMatrix4x4FromCluster (const ECLCluster *cluster, const TMatrixDSym &covmatvertex, const TMatrixD &jacobiMatrix)
 Returns 4x4 covariance matrix (px, py, pz, E) More...
 
const TMatrixDSym GetCovarianceMatrix7x7FromCluster (const ECLCluster *cluster, const TMatrixD &jacobiMatrix)
 Returns 7x7 covariance matrix (px, py, pz, E, x, y, z) More...
 
const TMatrixDSym GetCovarianceMatrix7x7FromCluster (const ECLCluster *cluster, const TMatrixDSym &covmatvertex, const TMatrixD &jacobiMatrix)
 Returns 7x7 covariance matrix (px, py, pz, E, x, y, z) More...
 
const ROOT::Math::XYZVector GetIPPosition ()
 Returns default IP position from beam parameters. More...
 
const TMatrixDSym GetIPPositionCovarianceMatrix ()
 Returns default IP position covariance matrix from beam parameters. More...
 

Private Attributes

DBObjPtr< BeamSpot > m_beamSpotDB
 Beam spot database object.
 
OptionalDBObjPtr< ECLPhotonEnergyResolution > m_photonEnergyResolutionDB
 Photon energy resolution database object.
 

Detailed Description

Class to provide momentum-related information from ECLClusters.

This requires the prior knowledge of the particle type (e.g., photon), and a vertex hypothesis. The default vertex hypothesis is taken from the beamparameters.

Definition at line 36 of file ClusterUtils.h.

Member Function Documentation

◆ Get4MomentumFromCluster() [1/2]

const PxPyPzEVector Get4MomentumFromCluster ( const ECLCluster *  cluster,
const ROOT::Math::XYZVector &  vertex,
ECLCluster::EHypothesisBit  hypo 
)

Returns four momentum vector.

Returns
const four momentum vector

Definition at line 32 of file ClusterUtils.cc.

34 {
35 
36  // Get particle direction from vertex and reconstructed cluster position.
37  XYZVector direction(cluster->getClusterPosition().X() - vertex.X(),
38  cluster->getClusterPosition().Y() - vertex.Y(),
39  cluster->getClusterPosition().Z() - vertex.Z());
40 
41  // Always ignore mass here (even for neutral hadrons) therefore the magnitude
42  // of the momentum is equal to the cluster energy under this hypo.
43  const double E = cluster->getEnergy(hypo); // must not be changed or clusterE getters will be wrong
44  const double px = E * sin(direction.Theta()) * cos(direction.Phi());
45  const double py = E * sin(direction.Theta()) * sin(direction.Phi());
46  const double pz = E * cos(direction.Theta());
47 
48  const PxPyPzEVector l(px, py, pz, E);
49  return l;
50 }

◆ Get4MomentumFromCluster() [2/2]

const PxPyPzEVector Get4MomentumFromCluster ( const ECLCluster *  cluster,
ECLCluster::EHypothesisBit  hypo 
)

Returns four momentum vector.

Returns
const four momentum vector

Definition at line 25 of file ClusterUtils.cc.

◆ GetCluster4MomentumFromCluster()

const PxPyPzEVector GetCluster4MomentumFromCluster ( const ECLCluster *  cluster,
ECLCluster::EHypothesisBit  hypo 
)

Returns cluster four momentum vector.

Returns
const cluster four momentum vector

Definition at line 19 of file ClusterUtils.cc.

◆ GetCovarianceMatrix3x3FromCluster()

const TMatrixDSym GetCovarianceMatrix3x3FromCluster ( const ECLCluster *  cluster)

Returns 3x3 covariance matrix (E, theta, phi)

Returns
const TMatrixDSym

Replace fixed energy resolution value by derived value from the DB if present

Definition at line 134 of file ClusterUtils.cc.

◆ GetCovarianceMatrix4x4FromCluster() [1/2]

const TMatrixDSym GetCovarianceMatrix4x4FromCluster ( const ECLCluster *  cluster,
const TMatrixD &  jacobiMatrix 
)

Returns 4x4 covariance matrix (px, py, pz, E)

Returns
const TMatrixDSym

Definition at line 156 of file ClusterUtils.cc.

◆ GetCovarianceMatrix4x4FromCluster() [2/2]

const TMatrixDSym GetCovarianceMatrix4x4FromCluster ( const ECLCluster *  cluster,
const TMatrixDSym &  covmatvertex,
const TMatrixD &  jacobiMatrix 
)

Returns 4x4 covariance matrix (px, py, pz, E)

Returns
const TMatrixDSym

Definition at line 162 of file ClusterUtils.cc.

◆ GetCovarianceMatrix7x7FromCluster() [1/2]

const TMatrixDSym GetCovarianceMatrix7x7FromCluster ( const ECLCluster *  cluster,
const TMatrixD &  jacobiMatrix 
)

Returns 7x7 covariance matrix (px, py, pz, E, x, y, z)

Returns
const TMatrixDSym

Definition at line 185 of file ClusterUtils.cc.

◆ GetCovarianceMatrix7x7FromCluster() [2/2]

const TMatrixDSym GetCovarianceMatrix7x7FromCluster ( const ECLCluster *  cluster,
const TMatrixDSym &  covmatvertex,
const TMatrixD &  jacobiMatrix 
)

Returns 7x7 covariance matrix (px, py, pz, E, x, y, z)

Returns
const TMatrixDSym

Definition at line 191 of file ClusterUtils.cc.

◆ GetIPPosition()

const XYZVector GetIPPosition ( )

Returns default IP position from beam parameters.

Returns
const XYZVector

Definition at line 216 of file ClusterUtils.cc.

◆ GetIPPositionCovarianceMatrix()

const TMatrixDSym GetIPPositionCovarianceMatrix ( )

Returns default IP position covariance matrix from beam parameters.

Returns
const TMatrixDSym

Definition at line 226 of file ClusterUtils.cc.

◆ GetJacobiMatrix4x6FromCluster() [1/2]

const TMatrixD GetJacobiMatrix4x6FromCluster ( const ECLCluster *  cluster,
const ROOT::Math::XYZVector &  vertex,
ECLCluster::EHypothesisBit  hypo 
)

Returns 4x6 Jacobi matrix (px, py, pz, E)

Returns
const TMatrixD

Definition at line 60 of file ClusterUtils.cc.

◆ GetJacobiMatrix4x6FromCluster() [2/2]

const TMatrixD GetJacobiMatrix4x6FromCluster ( const ECLCluster *  cluster,
ECLCluster::EHypothesisBit  hypo 
)

Returns 4x6 Jacobi matrix (px, py, pz, E)

Returns
const TMatrixD

Definition at line 54 of file ClusterUtils.cc.

The documentation for this class was generated from the following files: