Bug fix. Removed delete statement
[u/mrichter/AliRoot.git] / STEER / AliExternalTrackParam.h
CommitLineData
51ad6848 1#ifndef ALIEXTERNALTRACKPARAM_H
2#define ALIEXTERNALTRACKPARAM_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
49d13e89 8/*****************************************************************************
9 * "External" track parametrisation class *
10 * *
11 * external param0: local Y-coordinate of a track (cm) *
12 * external param1: local Z-coordinate of a track (cm) *
13 * external param2: local sine of the track momentum azimuthal angle *
14 * external param3: tangent of the track momentum dip angle *
15 * external param4: 1/pt (1/(GeV/c)) *
16 * *
17 * The parameters are estimated at an exact position x in a local coord. *
18 * system rotated by angle alpha with respect to the global coord.system. *
19 * Origin: I.Belikov, CERN, Jouri.Belikov@cern.ch *
20 *****************************************************************************/
6c94f330 21#include "TMath.h"
a5e407e9 22
4f6e22bd 23#include "AliVTrack.h"
def9660e 24
49d13e89 25const Double_t kVeryBig=1./kAlmost0;
7b5ef2e6 26const Double_t kMostProbablePt=0.35;
5773defd 27
58e536c5 28class AliVVertex;
0c19adf7 29class TPolyMarker3D;
c683ddc2 30
4f6e22bd 31class AliExternalTrackParam: public AliVTrack {
51ad6848 32 public:
33 AliExternalTrackParam();
6c94f330 34 AliExternalTrackParam(const AliExternalTrackParam &);
def9660e 35 AliExternalTrackParam& operator=(const AliExternalTrackParam & trkPar);
51ad6848 36 AliExternalTrackParam(Double_t x, Double_t alpha,
37 const Double_t param[5], const Double_t covar[15]);
4f6e22bd 38 AliExternalTrackParam(const AliVTrack *vTrack);
da4e3deb 39 AliExternalTrackParam(Double_t xyz[3],Double_t pxpypz[3],
40 Double_t cv[21],Short_t sign);
1530f89c 41 virtual ~AliExternalTrackParam(){}
ac3eaff4 42
1443179a 43 template <typename T>
44 void Set(T x, T alpha, const T param[5], const T covar[15]) {
45 // Sets the parameters
46 fX=x; fAlpha=alpha;
47 for (Int_t i = 0; i < 5; i++) fP[i] = param[i];
48 for (Int_t i = 0; i < 15; i++) fC[i] = covar[i];
49 }
50
4f6e22bd 51 void Set(Double_t xyz[3],Double_t pxpypz[3],Double_t cv[21],Short_t sign);
ed5f2849 52
53 static void SetMostProbablePt(Double_t pt) { fgMostProbablePt=pt; }
54 static Double_t GetMostProbablePt() { return fgMostProbablePt; }
55
c9ec41e8 56 void Reset();
ed5f2849 57 void ResetCovariance(Double_t s2);
3775b0ca 58 void AddCovariance(const Double_t cov[15]);
c9ec41e8 59
49d13e89 60 const Double_t *GetParameter() const {return fP;}
61 const Double_t *GetCovariance() const {return fC;}
6c94f330 62
63 Double_t GetAlpha() const {return fAlpha;}
c7bafca9 64 Double_t GetX() const {return fX;}
2d57349e 65 Double_t GetY() const {return fP[0];}
66 Double_t GetZ() const {return fP[1];}
6c94f330 67 Double_t GetSnp() const {return fP[2];}
68 Double_t GetTgl() const {return fP[3];}
def9660e 69 Double_t GetSigned1Pt() const {return fP[4];}
6c94f330 70
71 Double_t GetSigmaY2() const {return fC[0];}
72 Double_t GetSigmaZY() const {return fC[1];}
73 Double_t GetSigmaZ2() const {return fC[2];}
74 Double_t GetSigmaSnpY() const {return fC[3];}
75 Double_t GetSigmaSnpZ() const {return fC[4];}
76 Double_t GetSigmaSnp2() const {return fC[5];}
77 Double_t GetSigmaTglY() const {return fC[6];}
78 Double_t GetSigmaTglZ() const {return fC[7];}
79 Double_t GetSigmaTglSnp() const {return fC[8];}
80 Double_t GetSigmaTgl2() const {return fC[9];}
81 Double_t GetSigma1PtY() const {return fC[10];}
82 Double_t GetSigma1PtZ() const {return fC[11];}
83 Double_t GetSigma1PtSnp() const {return fC[12];}
84 Double_t GetSigma1PtTgl() const {return fC[13];}
85 Double_t GetSigma1Pt2() const {return fC[14];}
86
def9660e 87 // additional functions for AliVParticle
88 Double_t Px() const;
89 Double_t Py() const;
90 Double_t Pz() const;
91 Double_t Pt() const { return TMath::Abs(GetSignedPt()); }
92 Double_t P() const { return GetP(); }
c683ddc2 93 Bool_t PxPyPz(Double_t p[3]) const { return GetPxPyPz(p); }
94
95 Double_t Xv() const;
96 Double_t Yv() const;
97 Double_t Zv() const;
98 Bool_t XvYvZv(Double_t x[3]) const { return GetXYZ(x); }
99
def9660e 100 Double_t OneOverPt() const { return 1./Pt(); }
101 Double_t Phi() const;
102 Double_t Theta() const;
103 virtual Double_t E() const;
104 virtual Double_t M() const;
105 Double_t Eta() const;
106 virtual Double_t Y() const;
2258e165 107 virtual Short_t Charge() const { return (Short_t)GetSign(); }
67be2d29 108 virtual const Double_t *PID() const { return 0x0; }
def9660e 109
4f6e22bd 110 // additional functions from AliVTrack
111 virtual Int_t GetID() const { return -999; }
112 virtual UChar_t GetITSClusterMap() const {return 0; }
113 virtual ULong_t GetStatus() const { return 0; }
114
c9ec41e8 115 Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;}
116 Double_t GetP() const;
def9660e 117 Double_t GetSignedPt() const {
6c94f330 118 return (TMath::Abs(fP[4])>kAlmost0) ? 1./fP[4]:TMath::Sign(kVeryBig,fP[4]);
119 }
1d99986f 120 Double_t Get1P() const;
2258e165 121 virtual Double_t GetC(Double_t b) const {return fP[4]*b*kB2C;}
1530f89c 122 void GetDZ(Double_t x,Double_t y,Double_t z,Double_t b,Float_t dz[2]) const;
c7bafca9 123 Double_t GetD(Double_t xv, Double_t yv, Double_t b) const;
49d13e89 124 Double_t GetLinearD(Double_t xv, Double_t yv) const;
116b445b 125 Bool_t CorrectForMeanMaterial(Double_t xOverX0, Double_t xTimesRho,
7dded1d5 126 Double_t mass, Bool_t anglecorr=kFALSE,
d46683db 127 Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid);
128
9c56b409 129 //
130 // Bethe-Bloch formula parameterizations
131 //
132 static Double_t BetheBlochAleph(Double_t bg,
133 Double_t kp1=0.76176e-1,
134 Double_t kp2=10.632,
135 Double_t kp3=0.13279e-4,
136 Double_t kp4=1.8631,
137 Double_t kp5=1.9479
138 );
139 static Double_t BetheBlochGeant(Double_t bg,
140 Double_t kp0=2.33,
141 Double_t kp1=0.20,
142 Double_t kp2=3.00,
143 Double_t kp3=173e-9,
144 Double_t kp4=0.49848
145 );
146
d46683db 147 static Double_t BetheBlochSolid(Double_t bg);
148 static Double_t BetheBlochGas(Double_t bg);
149
49d13e89 150 Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const;
1e023a36 151
4b189f98 152 Double_t
153 GetPredictedChi2(Double_t p[3],Double_t covyz[3],Double_t covxyz[3]) const;
1e023a36 154 Bool_t
155 PropagateTo(Double_t p[3],Double_t covyz[3],Double_t covxyz[3],Double_t b);
156
e23a38cb 157 Double_t *GetResiduals(Double_t *p,Double_t *cov,Bool_t updated=kTRUE) const;
49d13e89 158 Bool_t Update(Double_t p[2],Double_t cov[3]);
159 Bool_t Rotate(Double_t alpha);
160 Bool_t PropagateTo(Double_t x, Double_t b);
9f2bec63 161 Bool_t Propagate(Double_t alpha, Double_t x, Double_t b);
052daaff 162 void Propagate(Double_t len,Double_t x[3],Double_t p[3],Double_t bz) const;
163 Bool_t Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const;
49d13e89 164
8b6e3369 165 static void g3helx3(Double_t qfield, Double_t step, Double_t vect[7]);
166 Bool_t PropagateToBxByBz(Double_t x, const Double_t b[3]);
167
c7bafca9 168 void GetHelixParameters(Double_t h[6], Double_t b) const;
169 Double_t GetDCA(const AliExternalTrackParam *p, Double_t b,
170 Double_t &xthis,Double_t &xp) const;
171 Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b);
58e536c5 172 Bool_t PropagateToDCA(const AliVVertex *vtx, Double_t b, Double_t maxd,
e99a34df 173 Double_t dz[2]=0, Double_t cov[3]=0);
174
b1149664 175 void GetDirection(Double_t d[3]) const;
c9ec41e8 176 Bool_t GetPxPyPz(Double_t *p) const;
177 Bool_t GetXYZ(Double_t *p) const;
178 Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const;
179 Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const;
180 Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const;
7cf7bb6c 181 Bool_t GetYAt(Double_t x, Double_t b, Double_t &y) const;
6c94f330 182 Bool_t GetZAt(Double_t x, Double_t b, Double_t &z) const;
c9ec41e8 183 void Print(Option_t* option = "") const;
c194ba83 184 Double_t GetSnpAt(Double_t x,Double_t b) const;
6c94f330 185
116b445b 186 //Deprecated
187 Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass,
d46683db 188 Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid);
116b445b 189
bf00ebb8 190 Bool_t GetDistance(AliExternalTrackParam *param2, Double_t x, Double_t dist[3], Double_t b);
0e8460af 191 Int_t GetIndex(Int_t i, Int_t j) const;
3c43fb2b 192 Int_t GetLabel() const {return -1;}
0c19adf7 193 //
194 // visualization (M. Ivanov)
195 //
196 virtual void FillPolymarker(TPolyMarker3D *pol, Float_t magf, Float_t minR, Float_t maxR, Float_t stepR);
197 virtual void DrawTrack(Float_t magF, Float_t minR, Float_t maxR, Float_t stepR);
cfdb62d4 198
199 virtual Bool_t Translate(Double_t *vTrasl,Double_t *covV);
200
0c19adf7 201 protected:
6c94f330 202 Double_t &Par(Int_t i) {return fP[i];}
203 Double_t &Cov(Int_t i) {return fC[i];}
0c19adf7 204
205 private:
bad5ac2c 206 Double32_t fX; // X coordinate for the point of parametrisation
207 Double32_t fAlpha; // Local <-->global coor.system rotation angle
208 Double32_t fP[5]; // The track parameters
209 Double32_t fC[15]; // The track parameter covariance matrix
c9ec41e8 210
ed5f2849 211 static Double32_t fgMostProbablePt; // "Most probable" pt
212 // (to be used if Bz=0)
4f6e22bd 213 ClassDef(AliExternalTrackParam, 8)
51ad6848 214};
215
ed5f2849 216inline void AliExternalTrackParam::ResetCovariance(Double_t s2) {
217 //
218 // Reset the covarince matrix to "something big"
219 //
220 fC[0]*= s2;
221 fC[1] = 0.; fC[2]*= s2;
222 fC[3] = 0.; fC[4] = 0.; fC[5]*= s2;
223 fC[6] = 0.; fC[7] = 0.; fC[8] = 0.; fC[9]*= s2;
224 fC[10]= 0.; fC[11]= 0.; fC[12]= 0.; fC[13]= 0.; fC[14]*=s2;
225}
226
bf00ebb8 227
228
229
51ad6848 230#endif