[u/mrichter/AliRoot.git] / STEER / AliVertexerTracks.h

#ifndef ALIVERTEXERTRACKS_H
#define ALIVERTEXERTRACKS_H
/* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */


//-------------------------------------------------------
// Class for vertex determination with tracks
//
//   Origin: AliITSVertexerTracks  
//           A.Dainese, Padova, andrea.dainese@pd.infn.it
//           M.Masera,  Torino, massimo.masera@to.infn.it 
//   Moved to STEER and adapted to ESD tracks: 
//           F.Prino, Torino, prino@to.infn.it 
//-------------------------------------------------------

/*****************************************************************************
 *                                                                           *
 * This class determines the vertex of a set of tracks.                      *
 * Different algorithms are implemented, see data member fAlgo.              *
 *                                                                           *
 *****************************************************************************/

#include <TObjArray.h>
#include <TMatrixD.h>

#include "AliESDVertex.h"
#include "AliExternalTrackParam.h"
#include "AliLog.h"

class AliESDEvent;

class AliVertexerTracks : public TObject {
  
 public:
  AliVertexerTracks(); 
  AliVertexerTracks(Double_t fieldkG); 
  virtual ~AliVertexerTracks();

  AliESDVertex* FindPrimaryVertex(const AliESDEvent *esdEvent);
  AliESDVertex* FindPrimaryVertex(TObjArray *trkArrayOrig,UShort_t *idOrig);
  AliESDVertex* VertexForSelectedTracks(TObjArray *trkArray,UShort_t *id,
					Bool_t optUseFitter=kTRUE,
					Bool_t optPropagate=kTRUE);
  AliESDVertex* VertexForSelectedESDTracks(TObjArray *trkArray,
					Bool_t optUseFitter=kTRUE,
					Bool_t optPropagate=kTRUE);
  AliESDVertex* RemoveTracksFromVertex(AliESDVertex *inVtx,
				       TObjArray *trkArray,UShort_t *id,
				       Float_t *diamondxy); 
  void SetITSMode(Double_t dcacut=0.1,
		  Double_t dcacutIter0=0.1,
		  Double_t maxd0z0=0.5,
		  Int_t minITScls=5,
		  Int_t mintrks=1,
		  Double_t nsigma=3.,
		  Double_t mindetfitter=100.,
		  Double_t maxtgl=1000.); 
  void SetTPCMode(Double_t dcacut=0.1,
		  Double_t dcacutIter0=1.0,
		  Double_t maxd0z0=5.0,
		  Int_t minITScls=0,
		  Int_t mintrks=1,
		  Double_t nsigma=3.,
		  Double_t mindetfitter=0.1,
		  Double_t maxtgl=1.5); 
  void  SetConstraintOff() { fConstraint=kFALSE; return; }
  void  SetConstraintOn() { fConstraint=kTRUE; return; }
  void  SetDebug(Int_t optdebug=0) { fDebug=optdebug; return; }
  void  SetDCAcut(Double_t maxdca) { fDCAcut=maxdca; return; }
  void  SetDCAcutIter0(Double_t maxdca) { fDCAcutIter0=maxdca; return; }
  void  SetFinderAlgorithm(Int_t opt=1) { fAlgo=opt; return; }
  void  SetITSrefitRequired() { fITSrefit=kTRUE; return; }
  void  SetITSrefitNotRequired() { fITSrefit=kFALSE; return; }
  void  SetMaxd0z0(Double_t maxd0z0=0.5) { fMaxd0z0=maxd0z0; return; }
  void  SetMinITSClusters(Int_t n=5) { fMinITSClusters=n; return; }
  void  SetMinTracks(Int_t n=1) { fMinTracks=n; return; }
  void  SetNSigmad0(Double_t n=3) { fNSigma=n; return; }
  Double_t GetNSigmad0() const { return fNSigma; }
  void  SetMinDetFitter(Double_t mindet=100.) { fMinDetFitter=mindet; return; }
  void  SetMaxTgl(Double_t maxtgl=1.) { fMaxTgl=maxtgl; return; }
  void  SetOnlyFitter() { if(!fConstraint) AliFatal("Set constraint first!"); 
     fOnlyFitter=kTRUE; return; }
  void  SetSkipTracks(Int_t n,Int_t *skipped);
  void  SetVtxStart(Double_t x=0,Double_t y=0,Double_t z=0) 
    { fNominalPos[0]=x; fNominalPos[1]=y; fNominalPos[2]=z; return; }
  void  SetVtxStartSigma(Double_t sx=3.,Double_t sy=3.,Double_t sz=15.) 
    { fNominalCov[0]=sx*sx; fNominalCov[2]=sy*sy; fNominalCov[5]=sz*sz;
      fNominalCov[1]=0.; fNominalCov[3]=0.; fNominalCov[4]=0.; return; }
  void  SetVtxStart(AliESDVertex *vtx);
  static Double_t GetStrLinMinDist(Double_t *p0,Double_t *p1,Double_t *x0);
  static Double_t GetDeterminant3X3(Double_t matr[][3]);
  static void GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t (*m)[3],Double_t *d);
  static void GetStrLinDerivMatrix(Double_t *p0,Double_t *p1,Double_t *sigmasq,Double_t (*m)[3],Double_t *d);
  static AliESDVertex TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights=0);
  void     SetFieldkG(Double_t field=-999.) { fFieldkG=field; return; }
  Double_t GetFieldkG() const { 
    if(fFieldkG<-99.) AliFatal("Field value not set");
    return fFieldkG; } 
  void SetNSigmaForUi00(Double_t n=1.5) { fnSigmaForUi00=n; return; }
  Double_t GetNSigmaForUi00() const { return fnSigmaForUi00; }

 protected:
  void     HelixVertexFinder();
  void     OneTrackVertFinder();
  Int_t    PrepareTracks(TObjArray &trkArrayOrig,UShort_t *idOrig,
			 Int_t optImpParCut);
  Bool_t   PropagateTrackTo(AliExternalTrackParam *track,
			    Double_t xToGo);
  Bool_t   TrackToPoint(AliExternalTrackParam *t,
		        TMatrixD &ri,TMatrixD &wWi,
			Bool_t uUi3by3=kFALSE) const;     
  void     VertexFinder(Int_t optUseWeights=0);
  void     VertexFitter();
  void     StrLinVertexFinderMinDist(Int_t optUseWeights=0);
  void     TooFewTracks();

  AliESDVertex fVert;         // vertex after vertex finder
  AliESDVertex *fCurrentVertex;  // ESD vertex after fitter
  UShort_t  fMode;            // 0 ITS+TPC; 1 TPC
  Double_t  fFieldkG;         // z component of field (kGauss) 
  Double_t  fNominalPos[3];   // initial knowledge on vertex position
  Double_t  fNominalCov[6];   // initial knowledge on vertex position
  TObjArray fTrkArraySel;     // array with tracks to be processed
  UShort_t  *fIdSel;          // IDs of the tracks (AliESDtrack::GetID())
  Int_t     *fTrksToSkip;     // track IDs to be skipped for find and fit 
  Int_t     fNTrksToSkip;     // number of tracks to be skipped 
  Bool_t    fConstraint;      // true when "mean vertex" was set in 
                              // fNominal ... and must be used in the fit
  Bool_t    fOnlyFitter;      // primary with one fitter shot only
                              // (use only with beam constraint)
  Int_t     fMinTracks;       // minimum number of tracks
  Int_t     fMinITSClusters;  // minimum number of ITS clusters per track
  Double_t  fDCAcut;          // maximum DCA between 2 tracks used for vertex
  Double_t  fDCAcutIter0;     // maximum DCA between 2 tracks used for vertex
  Double_t  fNSigma;          // number of sigmas for d0 cut in PrepareTracks()
  Double_t  fMaxd0z0;         // value for sqrt(d0d0+z0z0) cut 
                              // in PrepareTracks(1) if fConstraint=kFALSE
  Double_t  fMinDetFitter;    // minimum determinant to try to invertex matrix
  Double_t  fMaxTgl;          // maximum tgl of tracks
  Bool_t    fITSrefit;        // if kTRUE (default), use only kITSrefit tracks
                              // if kFALSE, use all tracks (also TPC only)
  Double_t  fnSigmaForUi00;   // n. sigmas from finder in TrackToPoint
  Int_t     fDebug;           //! debug flag - verbose printing if >0
  Int_t     fAlgo;            // option for vertex finding algorythm
  // fAlgo=1 (default) finds minimum-distance point among all selected tracks
  //         approximated as straight lines 
  //         and uses errors on track parameters as weights
  // fAlgo=2 finds minimum-distance point among all the selected tracks
  //         approximated as straight lines 
  // fAlgo=3 finds the average point among DCA points of all pairs of tracks
  //         treated as helices
  // fAlgo=4 finds the average point among DCA points of all pairs of tracks
  //         approximated as straight lines 
  //         and uses errors on track parameters as weights
  // fAlgo=5 finds the average point among DCA points of all pairs of tracks
  //         approximated as straight lines 


 private:
  AliVertexerTracks(const AliVertexerTracks & source);
  AliVertexerTracks & operator=(const AliVertexerTracks & source);

  ClassDef(AliVertexerTracks,11) // 3D Vertexing with tracks 
};

#endif
Commit	Line	Data
2d57349e	1	#ifndef ALIVERTEXERTRACKS_H
	2	#define ALIVERTEXERTRACKS_H
	3	/* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
	4	* See cxx source for full Copyright notice */
	5
	6
	7	//-------------------------------------------------------
6d8df534	8	// Class for vertex determination with tracks
2d57349e	9	//
	10	// Origin: AliITSVertexerTracks
	11	// A.Dainese, Padova, andrea.dainese@pd.infn.it
	12	// M.Masera, Torino, massimo.masera@to.infn.it
	13	// Moved to STEER and adapted to ESD tracks:
	14	// F.Prino, Torino, prino@to.infn.it
	15	//-------------------------------------------------------
	16
	17	/*****************************************************************************
	18	* *
6d8df534	19	* This class determines the vertex of a set of tracks. *
2d57349e	20	* Different algorithms are implemented, see data member fAlgo. *
	21	* *
	22	*****************************************************************************/
	23
2d57349e	24	#include <TObjArray.h>
fee9ef0d	25	#include <TMatrixD.h>
2d57349e	26
6d8df534	27	#include "AliESDVertex.h"
	28	#include "AliExternalTrackParam.h"
	29	#include "AliLog.h"
	30
af885e0f	31	class AliESDEvent;
2d57349e	32
	33	class AliVertexerTracks : public TObject {
	34
	35	public:
	36	AliVertexerTracks();
dc3719f3	37	AliVertexerTracks(Double_t fieldkG);
2d57349e	38	virtual ~AliVertexerTracks();
2d57349e	39
af885e0f	40	AliESDVertex* FindPrimaryVertex(const AliESDEvent *esdEvent);
6d8df534	41	AliESDVertex* FindPrimaryVertex(TObjArray trkArrayOrig,UShort_t idOrig);
	42	AliESDVertex* VertexForSelectedTracks(TObjArray trkArray,UShort_t id,
	43	Bool_t optUseFitter=kTRUE,
	44	Bool_t optPropagate=kTRUE);
	45	AliESDVertex* VertexForSelectedESDTracks(TObjArray *trkArray,
	46	Bool_t optUseFitter=kTRUE,
	47	Bool_t optPropagate=kTRUE);
	48	AliESDVertex* RemoveTracksFromVertex(AliESDVertex *inVtx,
	49	TObjArray trkArray,UShort_t id,
	50	Float_t *diamondxy);
f09c879d	51	void SetITSMode(Double_t dcacut=0.1,
	52	Double_t dcacutIter0=0.1,
	53	Double_t maxd0z0=0.5,
	54	Int_t minITScls=5,
	55	Int_t mintrks=1,
	56	Double_t nsigma=3.,
	57	Double_t mindetfitter=100.,
	58	Double_t maxtgl=1000.);
	59	void SetTPCMode(Double_t dcacut=0.1,
	60	Double_t dcacutIter0=1.0,
	61	Double_t maxd0z0=5.0,
	62	Int_t minITScls=0,
	63	Int_t mintrks=1,
	64	Double_t nsigma=3.,
	65	Double_t mindetfitter=0.1,
	66	Double_t maxtgl=1.5);
fee9ef0d	67	void SetConstraintOff() { fConstraint=kFALSE; return; }
	68	void SetConstraintOn() { fConstraint=kTRUE; return; }
	69	void SetDebug(Int_t optdebug=0) { fDebug=optdebug; return; }
	70	void SetDCAcut(Double_t maxdca) { fDCAcut=maxdca; return; }
f09c879d	71	void SetDCAcutIter0(Double_t maxdca) { fDCAcutIter0=maxdca; return; }
fee9ef0d	72	void SetFinderAlgorithm(Int_t opt=1) { fAlgo=opt; return; }
6d8df534	73	void SetITSrefitRequired() { fITSrefit=kTRUE; return; }
50ff0bcd	74	void SetITSrefitNotRequired() { fITSrefit=kFALSE; return; }
fee9ef0d	75	void SetMaxd0z0(Double_t maxd0z0=0.5) { fMaxd0z0=maxd0z0; return; }
6d8df534	76	void SetMinITSClusters(Int_t n=5) { fMinITSClusters=n; return; }
6d8df534	77	void SetMinTracks(Int_t n=1) { fMinTracks=n; return; }
fee9ef0d	78	void SetNSigmad0(Double_t n=3) { fNSigma=n; return; }
fee9ef0d	79	Double_t GetNSigmad0() const { return fNSigma; }
f09c879d	80	void SetMinDetFitter(Double_t mindet=100.) { fMinDetFitter=mindet; return; }
f09c879d	81	void SetMaxTgl(Double_t maxtgl=1.) { fMaxTgl=maxtgl; return; }
fee9ef0d	82	void SetOnlyFitter() { if(!fConstraint) AliFatal("Set constraint first!");
fee9ef0d	83	fOnlyFitter=kTRUE; return; }
ec1be5d5	84	void SetSkipTracks(Int_t n,Int_t *skipped);
3b768a1d	85	void SetVtxStart(Double_t x=0,Double_t y=0,Double_t z=0)
07680cae	86	{ fNominalPos[0]=x; fNominalPos[1]=y; fNominalPos[2]=z; return; }
146c29df	87	void SetVtxStartSigma(Double_t sx=3.,Double_t sy=3.,Double_t sz=15.)
50ff0bcd	88	{ fNominalCov[0]=sxsx; fNominalCov[2]=sysy; fNominalCov[5]=sz*sz;
	89	fNominalCov[1]=0.; fNominalCov[3]=0.; fNominalCov[4]=0.; return; }
	90	void SetVtxStart(AliESDVertex *vtx);
71d84967	91	static Double_t GetStrLinMinDist(Double_t p0,Double_t p1,Double_t *x0);
	92	static Double_t GetDeterminant3X3(Double_t matr[][3]);
	93	static void GetStrLinDerivMatrix(Double_t p0,Double_t p1,Double_t (m)[3],Double_t d);
	94	static void GetStrLinDerivMatrix(Double_t p0,Double_t p1,Double_t sigmasq,Double_t (m)[3],Double_t *d);
146c29df	95	static AliESDVertex TrackletVertexFinder(TClonesArray *lines, Int_t optUseWeights=0);
dc3719f3	96	void SetFieldkG(Double_t field=-999.) { fFieldkG=field; return; }
	97	Double_t GetFieldkG() const {
	98	if(fFieldkG<-99.) AliFatal("Field value not set");
	99	return fFieldkG; }
3b768a1d	100	void SetNSigmaForUi00(Double_t n=1.5) { fnSigmaForUi00=n; return; }
3b768a1d	101	Double_t GetNSigmaForUi00() const { return fnSigmaForUi00; }
07680cae	102
2d57349e	103	protected:
fee9ef0d	104	void HelixVertexFinder();
0c69be49	105	void OneTrackVertFinder();
6d8df534	106	Int_t PrepareTracks(TObjArray &trkArrayOrig,UShort_t *idOrig,
6d8df534	107	Int_t optImpParCut);
f09c879d	108	Bool_t PropagateTrackTo(AliExternalTrackParam *track,
f09c879d	109	Double_t xToGo);
6d8df534	110	Bool_t TrackToPoint(AliExternalTrackParam *t,
0bf2e2b4	111	TMatrixD &ri,TMatrixD &wWi,
0bf2e2b4	112	Bool_t uUi3by3=kFALSE) const;
2d57349e	113	void VertexFinder(Int_t optUseWeights=0);
6d8df534	114	void VertexFitter();
fee9ef0d	115	void StrLinVertexFinderMinDist(Int_t optUseWeights=0);
6d8df534	116	void TooFewTracks();
eae1677e	117
146c29df	118	AliESDVertex fVert; // vertex after vertex finder
ec1be5d5	119	AliESDVertex *fCurrentVertex; // ESD vertex after fitter
f09c879d	120	UShort_t fMode; // 0 ITS+TPC; 1 TPC
dc3719f3	121	Double_t fFieldkG; // z component of field (kGauss)
07680cae	122	Double_t fNominalPos[3]; // initial knowledge on vertex position
50ff0bcd	123	Double_t fNominalCov[6]; // initial knowledge on vertex position
f09c879d	124	TObjArray fTrkArraySel; // array with tracks to be processed
	125	UShort_t *fIdSel; // IDs of the tracks (AliESDtrack::GetID())
	126	Int_t *fTrksToSkip; // track IDs to be skipped for find and fit
	127	Int_t fNTrksToSkip; // number of tracks to be skipped
fee9ef0d	128	Bool_t fConstraint; // true when "mean vertex" was set in
	129	// fNominal ... and must be used in the fit
	130	Bool_t fOnlyFitter; // primary with one fitter shot only
	131	// (use only with beam constraint)
2d57349e	132	Int_t fMinTracks; // minimum number of tracks
07680cae	133	Int_t fMinITSClusters; // minimum number of ITS clusters per track
2d57349e	134	Double_t fDCAcut; // maximum DCA between 2 tracks used for vertex
f09c879d	135	Double_t fDCAcutIter0; // maximum DCA between 2 tracks used for vertex
07680cae	136	Double_t fNSigma; // number of sigmas for d0 cut in PrepareTracks()
43c9dae1	137	Double_t fMaxd0z0; // value for sqrt(d0d0+z0z0) cut
fee9ef0d	138	// in PrepareTracks(1) if fConstraint=kFALSE
f09c879d	139	Double_t fMinDetFitter; // minimum determinant to try to invertex matrix
f09c879d	140	Double_t fMaxTgl; // maximum tgl of tracks
50ff0bcd	141	Bool_t fITSrefit; // if kTRUE (default), use only kITSrefit tracks
50ff0bcd	142	// if kFALSE, use all tracks (also TPC only)
3b768a1d	143	Double_t fnSigmaForUi00; // n. sigmas from finder in TrackToPoint
50ff0bcd	144	Int_t fDebug; //! debug flag - verbose printing if >0
f09c879d	145	Int_t fAlgo; // option for vertex finding algorythm
2d57349e	146	// fAlgo=1 (default) finds minimum-distance point among all selected tracks
	147	// approximated as straight lines
	148	// and uses errors on track parameters as weights
	149	// fAlgo=2 finds minimum-distance point among all the selected tracks
	150	// approximated as straight lines
	151	// fAlgo=3 finds the average point among DCA points of all pairs of tracks
	152	// treated as helices
	153	// fAlgo=4 finds the average point among DCA points of all pairs of tracks
	154	// approximated as straight lines
	155	// and uses errors on track parameters as weights
	156	// fAlgo=5 finds the average point among DCA points of all pairs of tracks
	157	// approximated as straight lines
	158
3b768a1d	159
fe12e09c	160	private:
	161	AliVertexerTracks(const AliVertexerTracks & source);
	162	AliVertexerTracks & operator=(const AliVertexerTracks & source);
2d57349e	163
f09c879d	164	ClassDef(AliVertexerTracks,11) // 3D Vertexing with tracks
2d57349e	165	};
	166
	167	#endif
43c9dae1	168