[u/mrichter/AliRoot.git] / STEER / ESD / 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 "AliLog.h"
#include "AliESDVertex.h"


class AliExternalTrackParam;
class AliVEvent;
class AliESDEvent;
class AliStrLine;

class AliVertexerTracks : public TObject {
  
 public:
  enum {kTOFBCShift=200, 
	kStrLinVertexFinderMinDist1=1,
	kStrLinVertexFinderMinDist0=2,
	kHelixVertexFinder=3,
	kVertexFinder1=4,
	kVertexFinder0=5,
	kMultiVertexer=6};
  enum {kBitUsed = BIT(16),kBitAccounted = BIT(17)};
  AliVertexerTracks(); 
  AliVertexerTracks(Double_t fieldkG); 
  virtual ~AliVertexerTracks();

  AliESDVertex* FindPrimaryVertex(const AliVEvent *vEvent);
  AliESDVertex* FindPrimaryVertex(const TObjArray *trkArrayOrig,UShort_t *idOrig);
  AliESDVertex* VertexForSelectedTracks(const TObjArray *trkArray,UShort_t *id,
					Bool_t optUseFitter=kTRUE,
					Bool_t optPropagate=kTRUE,
					Bool_t optUseDiamondConstraint=kFALSE);
  AliESDVertex* VertexForSelectedESDTracks(TObjArray *trkArray,
					Bool_t optUseFitter=kTRUE,
					Bool_t optPropagate=kTRUE,
					Bool_t optUseDiamondConstraint=kFALSE);
  AliESDVertex* RemoveTracksFromVertex(AliESDVertex *inVtx,
				       const TObjArray *trkArray,UShort_t *id,
				       const Float_t *diamondxy) const; 
  AliESDVertex* RemoveConstraintFromVertex(AliESDVertex *inVtx,
					   Float_t *diamondxyz,
					   Float_t *diamondcov) const;
  void  SetITSMode(Double_t dcacut=0.1,
		   Double_t dcacutIter0=0.1,
		   Double_t maxd0z0=0.5,
		   Int_t minCls=5,
		   Int_t mintrks=1,
		   Double_t nsigma=3.,
		   Double_t mindetfitter=100.,
		   Double_t maxtgl=1000.,
		   Double_t fidR=3.,
		   Double_t fidZ=30.,
		   Int_t finderAlgo=1,
		   Int_t finderAlgoIter0=4); 
  void  SetTPCMode(Double_t dcacut=0.1,
		   Double_t dcacutIter0=1.0,
		   Double_t maxd0z0=5.0,
		   Int_t minCls=10,
		   Int_t mintrks=1,
		   Double_t nsigma=3.,
		   Double_t mindetfitter=0.1,
		   Double_t maxtgl=1.5, 
		   Double_t fidR=3.,
		   Double_t fidZ=30.,
		   Int_t finderAlgo=1,
		   Int_t finderAlgoIter0=4); 
  void  SetCuts(Double_t *cuts);
  void  SetConstraintOff() { fConstraint=kFALSE; SetVtxStart(); SetVtxStartSigma(); return; }
  void  SetConstraintOn() { fConstraint=kTRUE; 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  SetITSpureSA() { fITSpureSA=kTRUE; return; }
  Bool_t GetITSrefitRequired() const { return fITSrefit; }
  void  SetITSrefitNotRequired() { fITSrefit=kFALSE; return; }
  void  SetFiducialRZ(Double_t r=3,Double_t z=30) { fFiducialR=r; fFiducialZ=z; return; }
  void  SetMaxd0z0(Double_t maxd0z0=0.5) { fMaxd0z0=maxd0z0; return; }
  void  SetMinClusters(Int_t n=5) { fMinClusters=n; return; }
  Int_t GetMinClusters() const { return fMinClusters; }
  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,const 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);
  void  SetSelectOnTOFBunchCrossing(Bool_t select=kFALSE,Bool_t keepAlsoUnflagged=kTRUE) {fSelectOnTOFBunchCrossing=select; fKeepAlsoUnflaggedTOFBunchCrossing=keepAlsoUnflagged; return;}
  //
  static Double_t GetStrLinMinDist(const Double_t *p0,const Double_t *p1,const Double_t *x0);
  static Double_t GetDeterminant3X3(Double_t matr[][3]);
  static void GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,Double_t (*m)[3],Double_t *d);
  static void GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,const Double_t *sigmasq,Double_t (*m)[3],Double_t *d);
  static AliESDVertex TrackletVertexFinder(const TClonesArray *lines, Int_t optUseWeights=0);
  static AliESDVertex TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, 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; }
  //
  void SetMVTukey2(double t=6)             {fMVTukey2     = t;}
  void SetMVSig2Ini(double t=1e3)          {fMVSig2Ini    = t;}
  void SetMVMaxSigma2(double t=3.)         {fMVMaxSigma2  = t;}
  void SetMVMinSig2Red(double t=0.005)     {fMVMinSig2Red = t;}
  void SetMVMinDst(double t=10e-4)         {fMVMinDst     = t;}
  void SetMVScanStep(double t=2.)          {fMVScanStep   = t;}
  void SetMVFinalWBinary(Bool_t v=kTRUE)   {fMVFinalWBinary = v;}
  void SetMVMaxWghNtr(double w=10.)        {fMVMaxWghNtr  = w;}
  //
  void   FindVerticesMV();
  Bool_t FindNextVertexMV();
  //
  AliESDVertex* GetCurrentVertex() const {return (AliESDVertex*)fCurrentVertex;}
  TObjArray*    GetVerticesArray() const {return (TObjArray*)fMVVertices;}   // RS to be removed
  void          AnalyzePileUp(AliESDEvent* esdEv);
  void          SetBCSpacing(Int_t ns=50) {fBCSpacing = ns;}
  //
 protected:
  void     HelixVertexFinder();
  void     OneTrackVertFinder();
  Int_t    PrepareTracks(const TObjArray &trkArrayOrig,const 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(Bool_t vfit=kTRUE, Bool_t chiCalc=kTRUE,Int_t useWeights=0);
  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     fMinClusters;     // minimum number of ITS or TPC 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)
  Bool_t    fITSpureSA;       // if kFALSE (default) skip ITSpureSA tracks
                              // if kTRUE use only those
  Double_t  fFiducialR;       // radius of fiducial cylinder for tracks 
  Double_t  fFiducialZ;       // length of fiducial cylinder for tracks
  Double_t  fnSigmaForUi00;   // n. sigmas from finder in TrackToPoint
  Int_t     fAlgo;            // option for vertex finding algorythm
  Int_t     fAlgoIter0;       // this is for iteration 0  
  // 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 
  //
  Bool_t    fSelectOnTOFBunchCrossing;  // tracks from bunch crossing 0 
  Bool_t    fKeepAlsoUnflaggedTOFBunchCrossing; // also tracks w/o bunch crossing number (-1)
  // parameters for multivertexer
  Double_t fMVWSum;                    // sum of weights for multivertexer
  Double_t fMVWE2;                     // sum of weighted chi2's for  multivertexer
  Double_t fMVTukey2;                  // Tukey constant for multivertexer
  Double_t fMVSigma2;                  // chi2 current scaling param for multivertexer
  Double_t fMVSig2Ini;                 // initial value for fMVSigma2
  Double_t fMVMaxSigma2;               // max acceptable value for final fMVSigma2
  Double_t fMVMinSig2Red;              // min reduction of fMVSigma2 to exit the loop
  Double_t fMVMinDst;                  // min distance between vertices at two iterations to exit
  Double_t fMVScanStep;                // step of vertices scan
  Double_t fMVMaxWghNtr;               // min W-distance*Ncontr_min for close vertices
  Bool_t   fMVFinalWBinary;            // for the final fit use binary weights
  Int_t    fBCSpacing;                 // BC Spacing in ns (will define the rounding of BCid)
  TObjArray* fMVVertices;              // array of found vertices
  //
 private:
  AliVertexerTracks(const AliVertexerTracks & source);
  AliVertexerTracks & operator=(const AliVertexerTracks & source);

  ClassDef(AliVertexerTracks,15) // 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>
817e1004	25	#include <TMatrixD.h>
2d57349e	26
6d8df534	27	#include "AliLog.h"
f5740e9a	28	#include "AliESDVertex.h"
6d8df534	29
817e1004	30
f5740e9a	31	class AliExternalTrackParam;
0aa2faf4	32	class AliVEvent;
3f2db92f	33	class AliESDEvent;
8e104736	34	class AliStrLine;
2d57349e	35
	36	class AliVertexerTracks : public TObject {
	37
	38	public:
3f2db92f	39	enum {kTOFBCShift=200,
	40	kStrLinVertexFinderMinDist1=1,
	41	kStrLinVertexFinderMinDist0=2,
	42	kHelixVertexFinder=3,
	43	kVertexFinder1=4,
	44	kVertexFinder0=5,
	45	kMultiVertexer=6};
	46	enum {kBitUsed = BIT(16),kBitAccounted = BIT(17)};
2d57349e	47	AliVertexerTracks();
dc3719f3	48	AliVertexerTracks(Double_t fieldkG);
2d57349e	49	virtual ~AliVertexerTracks();
2d57349e	50
f5740e9a	51	AliESDVertex* FindPrimaryVertex(const AliVEvent *vEvent);
	52	AliESDVertex* FindPrimaryVertex(const TObjArray trkArrayOrig,UShort_t idOrig);
	53	AliESDVertex* VertexForSelectedTracks(const TObjArray trkArray,UShort_t id,
6d8df534	54	Bool_t optUseFitter=kTRUE,
97669588	55	Bool_t optPropagate=kTRUE,
97669588	56	Bool_t optUseDiamondConstraint=kFALSE);
6d8df534	57	AliESDVertex* VertexForSelectedESDTracks(TObjArray *trkArray,
6d8df534	58	Bool_t optUseFitter=kTRUE,
97669588	59	Bool_t optPropagate=kTRUE,
97669588	60	Bool_t optUseDiamondConstraint=kFALSE);
6d8df534	61	AliESDVertex* RemoveTracksFromVertex(AliESDVertex *inVtx,
f5740e9a	62	const TObjArray trkArray,UShort_t id,
f5740e9a	63	const Float_t *diamondxy) const;
6b908072	64	AliESDVertex* RemoveConstraintFromVertex(AliESDVertex *inVtx,
	65	Float_t *diamondxyz,
	66	Float_t *diamondcov) const;
a00021a7	67	void SetITSMode(Double_t dcacut=0.1,
	68	Double_t dcacutIter0=0.1,
	69	Double_t maxd0z0=0.5,
	70	Int_t minCls=5,
	71	Int_t mintrks=1,
	72	Double_t nsigma=3.,
	73	Double_t mindetfitter=100.,
	74	Double_t maxtgl=1000.,
	75	Double_t fidR=3.,
8c75f668	76	Double_t fidZ=30.,
	77	Int_t finderAlgo=1,
	78	Int_t finderAlgoIter0=4);
a00021a7	79	void SetTPCMode(Double_t dcacut=0.1,
	80	Double_t dcacutIter0=1.0,
	81	Double_t maxd0z0=5.0,
	82	Int_t minCls=10,
	83	Int_t mintrks=1,
	84	Double_t nsigma=3.,
	85	Double_t mindetfitter=0.1,
	86	Double_t maxtgl=1.5,
	87	Double_t fidR=3.,
8c75f668	88	Double_t fidZ=30.,
	89	Int_t finderAlgo=1,
	90	Int_t finderAlgoIter0=4);
a00021a7	91	void SetCuts(Double_t *cuts);
302c78d4	92	void SetConstraintOff() { fConstraint=kFALSE; SetVtxStart(); SetVtxStartSigma(); return; }
fee9ef0d	93	void SetConstraintOn() { fConstraint=kTRUE; return; }
fee9ef0d	94	void SetDCAcut(Double_t maxdca) { fDCAcut=maxdca; return; }
f09c879d	95	void SetDCAcutIter0(Double_t maxdca) { fDCAcutIter0=maxdca; return; }
fee9ef0d	96	void SetFinderAlgorithm(Int_t opt=1) { fAlgo=opt; return; }
6d8df534	97	void SetITSrefitRequired() { fITSrefit=kTRUE; return; }
40cfa14d	98	void SetITSpureSA() { fITSpureSA=kTRUE; return; }
0aa2faf4	99	Bool_t GetITSrefitRequired() const { return fITSrefit; }
50ff0bcd	100	void SetITSrefitNotRequired() { fITSrefit=kFALSE; return; }
6b29d399	101	void SetFiducialRZ(Double_t r=3,Double_t z=30) { fFiducialR=r; fFiducialZ=z; return; }
fee9ef0d	102	void SetMaxd0z0(Double_t maxd0z0=0.5) { fMaxd0z0=maxd0z0; return; }
6b29d399	103	void SetMinClusters(Int_t n=5) { fMinClusters=n; return; }
0aa2faf4	104	Int_t GetMinClusters() const { return fMinClusters; }
6d8df534	105	void SetMinTracks(Int_t n=1) { fMinTracks=n; return; }
fee9ef0d	106	void SetNSigmad0(Double_t n=3) { fNSigma=n; return; }
fee9ef0d	107	Double_t GetNSigmad0() const { return fNSigma; }
f09c879d	108	void SetMinDetFitter(Double_t mindet=100.) { fMinDetFitter=mindet; return; }
f09c879d	109	void SetMaxTgl(Double_t maxtgl=1.) { fMaxTgl=maxtgl; return; }
fee9ef0d	110	void SetOnlyFitter() { if(!fConstraint) AliFatal("Set constraint first!");
fee9ef0d	111	fOnlyFitter=kTRUE; return; }
f5740e9a	112	void SetSkipTracks(Int_t n,const Int_t *skipped);
3b768a1d	113	void SetVtxStart(Double_t x=0,Double_t y=0,Double_t z=0)
07680cae	114	{ fNominalPos[0]=x; fNominalPos[1]=y; fNominalPos[2]=z; return; }
146c29df	115	void SetVtxStartSigma(Double_t sx=3.,Double_t sy=3.,Double_t sz=15.)
50ff0bcd	116	{ fNominalCov[0]=sxsx; fNominalCov[2]=sysy; fNominalCov[5]=sz*sz;
	117	fNominalCov[1]=0.; fNominalCov[3]=0.; fNominalCov[4]=0.; return; }
	118	void SetVtxStart(AliESDVertex *vtx);
ce1c94a7	119	void SetSelectOnTOFBunchCrossing(Bool_t select=kFALSE,Bool_t keepAlsoUnflagged=kTRUE) {fSelectOnTOFBunchCrossing=select; fKeepAlsoUnflaggedTOFBunchCrossing=keepAlsoUnflagged; return;}
3f2db92f	120	//
f5740e9a	121	static Double_t GetStrLinMinDist(const Double_t p0,const Double_t p1,const Double_t *x0);
71d84967	122	static Double_t GetDeterminant3X3(Double_t matr[][3]);
817e1004	123	static void GetStrLinDerivMatrix(const Double_t p0,const Double_t p1,Double_t (m)[3],Double_t d);
f5740e9a	124	static void GetStrLinDerivMatrix(const Double_t p0,const Double_t p1,const Double_t sigmasq,Double_t (m)[3],Double_t *d);
f5740e9a	125	static AliESDVertex TrackletVertexFinder(const TClonesArray *lines, Int_t optUseWeights=0);
8e104736	126	static AliESDVertex TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, Int_t optUseWeights=0);
dc3719f3	127	void SetFieldkG(Double_t field=-999.) { fFieldkG=field; return; }
	128	Double_t GetFieldkG() const {
	129	if(fFieldkG<-99.) AliFatal("Field value not set");
	130	return fFieldkG; }
3b768a1d	131	void SetNSigmaForUi00(Double_t n=1.5) { fnSigmaForUi00=n; return; }
3b768a1d	132	Double_t GetNSigmaForUi00() const { return fnSigmaForUi00; }
3f2db92f	133	//
	134	void SetMVTukey2(double t=6) {fMVTukey2 = t;}
	135	void SetMVSig2Ini(double t=1e3) {fMVSig2Ini = t;}
	136	void SetMVMaxSigma2(double t=3.) {fMVMaxSigma2 = t;}
	137	void SetMVMinSig2Red(double t=0.005) {fMVMinSig2Red = t;}
	138	void SetMVMinDst(double t=10e-4) {fMVMinDst = t;}
	139	void SetMVScanStep(double t=2.) {fMVScanStep = t;}
	140	void SetMVFinalWBinary(Bool_t v=kTRUE) {fMVFinalWBinary = v;}
	141	void SetMVMaxWghNtr(double w=10.) {fMVMaxWghNtr = w;}
	142	//
	143	void FindVerticesMV();
	144	Bool_t FindNextVertexMV();
	145	//
	146	AliESDVertex* GetCurrentVertex() const {return (AliESDVertex*)fCurrentVertex;}
	147	TObjArray* GetVerticesArray() const {return (TObjArray*)fMVVertices;} // RS to be removed
	148	void AnalyzePileUp(AliESDEvent* esdEv);
	149	void SetBCSpacing(Int_t ns=50) {fBCSpacing = ns;}
	150	//
2d57349e	151	protected:
fee9ef0d	152	void HelixVertexFinder();
0c69be49	153	void OneTrackVertFinder();
f5740e9a	154	Int_t PrepareTracks(const TObjArray &trkArrayOrig,const UShort_t *idOrig,
6d8df534	155	Int_t optImpParCut);
f09c879d	156	Bool_t PropagateTrackTo(AliExternalTrackParam *track,
f09c879d	157	Double_t xToGo);
6d8df534	158	Bool_t TrackToPoint(AliExternalTrackParam *t,
817e1004	159	TMatrixD &ri,TMatrixD &wWi,
0bf2e2b4	160	Bool_t uUi3by3=kFALSE) const;
2d57349e	161	void VertexFinder(Int_t optUseWeights=0);
3f2db92f	162	void VertexFitter(Bool_t vfit=kTRUE, Bool_t chiCalc=kTRUE,Int_t useWeights=0);
fee9ef0d	163	void StrLinVertexFinderMinDist(Int_t optUseWeights=0);
6d8df534	164	void TooFewTracks();
eae1677e	165
146c29df	166	AliESDVertex fVert; // vertex after vertex finder
ec1be5d5	167	AliESDVertex *fCurrentVertex; // ESD vertex after fitter
f09c879d	168	UShort_t fMode; // 0 ITS+TPC; 1 TPC
dc3719f3	169	Double_t fFieldkG; // z component of field (kGauss)
07680cae	170	Double_t fNominalPos[3]; // initial knowledge on vertex position
50ff0bcd	171	Double_t fNominalCov[6]; // initial knowledge on vertex position
f09c879d	172	TObjArray fTrkArraySel; // array with tracks to be processed
	173	UShort_t *fIdSel; // IDs of the tracks (AliESDtrack::GetID())
	174	Int_t *fTrksToSkip; // track IDs to be skipped for find and fit
	175	Int_t fNTrksToSkip; // number of tracks to be skipped
fee9ef0d	176	Bool_t fConstraint; // true when "mean vertex" was set in
	177	// fNominal ... and must be used in the fit
	178	Bool_t fOnlyFitter; // primary with one fitter shot only
	179	// (use only with beam constraint)
2d57349e	180	Int_t fMinTracks; // minimum number of tracks
6b29d399	181	Int_t fMinClusters; // minimum number of ITS or TPC clusters per track
2d57349e	182	Double_t fDCAcut; // maximum DCA between 2 tracks used for vertex
f09c879d	183	Double_t fDCAcutIter0; // maximum DCA between 2 tracks used for vertex
07680cae	184	Double_t fNSigma; // number of sigmas for d0 cut in PrepareTracks()
43c9dae1	185	Double_t fMaxd0z0; // value for sqrt(d0d0+z0z0) cut
fee9ef0d	186	// in PrepareTracks(1) if fConstraint=kFALSE
f09c879d	187	Double_t fMinDetFitter; // minimum determinant to try to invertex matrix
f09c879d	188	Double_t fMaxTgl; // maximum tgl of tracks
50ff0bcd	189	Bool_t fITSrefit; // if kTRUE (default), use only kITSrefit tracks
50ff0bcd	190	// if kFALSE, use all tracks (also TPC only)
40cfa14d	191	Bool_t fITSpureSA; // if kFALSE (default) skip ITSpureSA tracks
40cfa14d	192	// if kTRUE use only those
6b29d399	193	Double_t fFiducialR; // radius of fiducial cylinder for tracks
6b29d399	194	Double_t fFiducialZ; // length of fiducial cylinder for tracks
3b768a1d	195	Double_t fnSigmaForUi00; // n. sigmas from finder in TrackToPoint
f09c879d	196	Int_t fAlgo; // option for vertex finding algorythm
3f2db92f	197	Int_t fAlgoIter0; // this is for iteration 0
2d57349e	198	// fAlgo=1 (default) finds minimum-distance point among all selected tracks
	199	// approximated as straight lines
	200	// and uses errors on track parameters as weights
	201	// fAlgo=2 finds minimum-distance point among all the selected tracks
	202	// approximated as straight lines
	203	// fAlgo=3 finds the average point among DCA points of all pairs of tracks
	204	// treated as helices
	205	// fAlgo=4 finds the average point among DCA points of all pairs of tracks
	206	// approximated as straight lines
	207	// and uses errors on track parameters as weights
	208	// fAlgo=5 finds the average point among DCA points of all pairs of tracks
	209	// approximated as straight lines
3f2db92f	210	//
ce1c94a7	211	Bool_t fSelectOnTOFBunchCrossing; // tracks from bunch crossing 0
ce1c94a7	212	Bool_t fKeepAlsoUnflaggedTOFBunchCrossing; // also tracks w/o bunch crossing number (-1)
3f2db92f	213	// parameters for multivertexer
	214	Double_t fMVWSum; // sum of weights for multivertexer
	215	Double_t fMVWE2; // sum of weighted chi2's for multivertexer
	216	Double_t fMVTukey2; // Tukey constant for multivertexer
	217	Double_t fMVSigma2; // chi2 current scaling param for multivertexer
	218	Double_t fMVSig2Ini; // initial value for fMVSigma2
	219	Double_t fMVMaxSigma2; // max acceptable value for final fMVSigma2
	220	Double_t fMVMinSig2Red; // min reduction of fMVSigma2 to exit the loop
	221	Double_t fMVMinDst; // min distance between vertices at two iterations to exit
	222	Double_t fMVScanStep; // step of vertices scan
	223	Double_t fMVMaxWghNtr; // min W-distance*Ncontr_min for close vertices
	224	Bool_t fMVFinalWBinary; // for the final fit use binary weights
	225	Int_t fBCSpacing; // BC Spacing in ns (will define the rounding of BCid)
	226	TObjArray* fMVVertices; // array of found vertices
	227	//
fe12e09c	228	private:
	229	AliVertexerTracks(const AliVertexerTracks & source);
	230	AliVertexerTracks & operator=(const AliVertexerTracks & source);
2d57349e	231
ce1c94a7	232	ClassDef(AliVertexerTracks,15) // 3D Vertexing with tracks
2d57349e	233	};
	234
	235	#endif
43c9dae1	236