CbmDcaVertexFinder Class Reference

Estimates a common vertex from multiple straight GlobalTracks. More...

#include <CbmDcaVertexFinder.h>

Classes
struct	PCA
struct	Qa

Public Member Functions
	CbmDcaVertexFinder ()
	CbmDcaVertexFinder (double max_dca)
	Constructor setting maximum DCA for track pair.
	CbmDcaVertexFinder (const std::vector< CbmGlobalTrack * > tracks)
	Constructor using input set of track.
	CbmDcaVertexFinder (const std::vector< CbmGlobalTrack * > tracks, const double max_dca)
	Constructor using input set of track, and maximum DCA for track pair.
void	SetTracks (const std::vector< CbmGlobalTrack * > tracks)
	Set input track.
	~CbmDcaVertexFinder ()=default
std::optional< CbmDcaVertexFinder::PCA >	FindPca (CbmGlobalTrack *trk_i, CbmGlobalTrack *trk_j)
	Calculate the Point of Closest Approach of two straight tracks if tracks are parallel it return a nullopt.
std::optional< CbmVertex >	FindVertex ()
	Run algorithm to find vertex.
void	EnableQa (Qa qa)

Private Attributes
const double	fMaxDca
std::vector< CbmGlobalTrack * >	fInputTracks
double	fNbPairs
std::optional< Qa >	fQA
TMatrixFSym	fCovMatrix

Detailed Description

Estimates a common vertex from multiple straight GlobalTracks.

The algorithm consist in averaging the PCA of all valid pair of tracks. A valid pair is defined but a cut in the maximum value for DCA

Definition at line 22 of file CbmDcaVertexFinder.h.

Constructor & Destructor Documentation

CbmDcaVertexFinder() [1/4]

CbmDcaVertexFinder::CbmDcaVertexFinder

(

)

Definition at line 12 of file CbmDcaVertexFinder.cxx.

References fCovMatrix, fInputTracks, fMaxDca, fNbPairs, and fQA.

CbmDcaVertexFinder() [2/4]

CbmDcaVertexFinder::CbmDcaVertexFinder

(

double

max_dca

)

Constructor setting maximum DCA for track pair.

Definition at line 22 of file CbmDcaVertexFinder.cxx.

References fCovMatrix, fInputTracks, fMaxDca, fNbPairs, and fQA.

CbmDcaVertexFinder() [3/4]

CbmDcaVertexFinder::CbmDcaVertexFinder

(

const std::vector< CbmGlobalTrack * >

tracks

)

Constructor using input set of track.

Default constructor.

Parameters

tracks

Definition at line 35 of file CbmDcaVertexFinder.cxx.

References fCovMatrix, fInputTracks, fMaxDca, fNbPairs, fQA, and tracks.

CbmDcaVertexFinder() [4/4]

CbmDcaVertexFinder::CbmDcaVertexFinder	(	const std::vector< CbmGlobalTrack * >	tracks,
		const double	max_dca )

Constructor using input set of track, and maximum DCA for track pair.

Default constructor.

Parameters

tracks

Definition at line 48 of file CbmDcaVertexFinder.cxx.

References fCovMatrix, fInputTracks, fMaxDca, fNbPairs, fQA, and tracks.

~CbmDcaVertexFinder()

CbmDcaVertexFinder::~CbmDcaVertexFinder ( )

default

Member Function Documentation

EnableQa()

void CbmDcaVertexFinder::EnableQa ( Qa qa )

inline

Definition at line 64 of file CbmDcaVertexFinder.h.

References fQA.

FindPca()

std::optional< CbmDcaVertexFinder::PCA > CbmDcaVertexFinder::FindPca	(	CbmGlobalTrack *	trk_i,
		CbmGlobalTrack *	trk_j )

Calculate the Point of Closest Approach of two straight tracks if tracks are parallel it return a nullopt.

Parameters

trk_i,trk_j

pointer to CbmGlobal tracks

Definition at line 97 of file CbmDcaVertexFinder.cxx.

References CbmGlobalTrack::GetParamFirst().

Referenced by FindVertex().

FindVertex()

std::optional< CbmVertex > CbmDcaVertexFinder::FindVertex

(

)

Run algorithm to find vertex.

find vertex using input tracks

Returns

std::optional<CbmVertex>:

• std::nullopt if algorithm fails or no vertex was found under present configuration

Definition at line 66 of file CbmDcaVertexFinder.cxx.

References fCovMatrix, FindPca(), fInputTracks, fMaxDca, fNbPairs, and fQA.

SetTracks()

void CbmDcaVertexFinder::SetTracks

(

const std::vector< CbmGlobalTrack * >

tracks

)

Set input track.

Definition at line 58 of file CbmDcaVertexFinder.cxx.

References fInputTracks, and tracks.

Member Data Documentation

fCovMatrix

TMatrixFSym CbmDcaVertexFinder::fCovMatrix

private

Definition at line 72 of file CbmDcaVertexFinder.h.

Referenced by CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), and FindVertex().

fInputTracks

std::vector<CbmGlobalTrack*> CbmDcaVertexFinder::fInputTracks

private

Definition at line 68 of file CbmDcaVertexFinder.h.

Referenced by CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), FindVertex(), and SetTracks().

fMaxDca

const double CbmDcaVertexFinder::fMaxDca

private

Definition at line 67 of file CbmDcaVertexFinder.h.

Referenced by CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), and FindVertex().

fNbPairs

double CbmDcaVertexFinder::fNbPairs

private

Definition at line 69 of file CbmDcaVertexFinder.h.

Referenced by CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), and FindVertex().

fQA

std::optional<Qa> CbmDcaVertexFinder::fQA

private

Definition at line 70 of file CbmDcaVertexFinder.h.

Referenced by CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), CbmDcaVertexFinder(), EnableQa(), and FindVertex().

---

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

• CbmDcaVertexFinder.h
• CbmDcaVertexFinder.cxx