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006b5f7f | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //------------------------------------------------------------------------- | |
17 | // Implementation of the ITS track class | |
18 | // | |
19 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
20 | //------------------------------------------------------------------------- | |
21 | ||
22 | #include <TMatrixD.h> | |
23 | ||
24 | #include <TMath.h> | |
25 | #include <iostream.h> | |
26 | ||
27 | #include "AliCluster.h" | |
517b130f | 28 | #include "AliTPCtrack.h" |
006b5f7f | 29 | #include "AliITStrackV2.h" |
30 | ||
31 | ClassImp(AliITStrackV2) | |
32 | ||
7f6ddf58 | 33 | const Int_t kWARN=5; |
006b5f7f | 34 | |
35 | //____________________________________________________________________________ | |
36 | AliITStrackV2::AliITStrackV2(const AliTPCtrack& t) throw (const Char_t *) { | |
37 | //------------------------------------------------------------------ | |
9b280d80 | 38 | //Conversion TPC track -> ITS track |
006b5f7f | 39 | //------------------------------------------------------------------ |
40 | SetLabel(t.GetLabel()); | |
41 | SetChi2(0.); | |
42 | SetNumberOfClusters(0); | |
14825d5a | 43 | //SetConvConst(t.GetConvConst()); |
44 | ||
7f6ddf58 | 45 | fdEdx = t.GetdEdx(); |
46 | SetMass(t.GetMass()); | |
47 | ||
006b5f7f | 48 | fAlpha = t.GetAlpha(); |
49 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
50 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
51 | ||
9b280d80 | 52 | //Conversion of the track parameters |
006b5f7f | 53 | Double_t x,p[5]; t.GetExternalParameters(x,p); |
9b280d80 | 54 | fX=x; x=GetConvConst(); |
006b5f7f | 55 | fP0=p[0]; |
56 | fP1=p[1]; | |
57 | fP2=p[2]; | |
58 | fP3=p[3]; | |
59 | fP4=p[4]/x; | |
60 | ||
9b280d80 | 61 | //Conversion of the covariance matrix |
006b5f7f | 62 | Double_t c[15]; t.GetExternalCovariance(c); |
63 | ||
64 | fC00=c[0 ]; | |
65 | fC10=c[1 ]; fC11=c[2 ]; | |
66 | fC20=c[3 ]; fC21=c[4 ]; fC22=c[5 ]; | |
67 | fC30=c[6 ]; fC31=c[7 ]; fC32=c[8 ]; fC33=c[9 ]; | |
68 | fC40=c[10]/x; fC41=c[11]/x; fC42=c[12]/x; fC43=c[13]/x; fC44=c[14]/x/x; | |
69 | ||
70 | if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; | |
71 | } | |
72 | ||
73 | //____________________________________________________________________________ | |
74 | AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : AliKalmanTrack(t) { | |
75 | //------------------------------------------------------------------ | |
76 | //Copy constructor | |
77 | //------------------------------------------------------------------ | |
78 | fX=t.fX; | |
79 | fAlpha=t.fAlpha; | |
80 | fdEdx=t.fdEdx; | |
81 | ||
82 | fP0=t.fP0; fP1=t.fP1; fP2=t.fP2; fP3=t.fP3; fP4=t.fP4; | |
83 | ||
84 | fC00=t.fC00; | |
85 | fC10=t.fC10; fC11=t.fC11; | |
86 | fC20=t.fC20; fC21=t.fC21; fC22=t.fC22; | |
87 | fC30=t.fC30; fC31=t.fC31; fC32=t.fC32; fC33=t.fC33; | |
88 | fC40=t.fC40; fC41=t.fC41; fC42=t.fC42; fC43=t.fC43; fC44=t.fC44; | |
89 | ||
90 | Int_t n=GetNumberOfClusters(); | |
23efe5f1 | 91 | //for (Int_t i=0; i<n; i++) fIndex[i]=t.fIndex[i]; |
92 | //b.b. | |
93 | for (Int_t i=0; i<n; i++) { | |
94 | fIndex[i]=t.fIndex[i]; | |
95 | fdEdxSample[i]=t.fdEdxSample[i]; | |
96 | } | |
97 | ||
006b5f7f | 98 | } |
7f6ddf58 | 99 | /* |
006b5f7f | 100 | //_____________________________________________________________________________ |
101 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
102 | //----------------------------------------------------------------- | |
103 | // This function compares tracks according to the their curvature | |
104 | //----------------------------------------------------------------- | |
7f6ddf58 | 105 | AliITStrackV2 *t=(AliITStrackV2*)o; |
006b5f7f | 106 | Double_t co=TMath::Abs(t->Get1Pt()); |
107 | Double_t c =TMath::Abs(Get1Pt()); | |
108 | if (c>co) return 1; | |
109 | else if (c<co) return -1; | |
110 | return 0; | |
111 | } | |
7f6ddf58 | 112 | */ |
113 | //_____________________________________________________________________________ | |
114 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
115 | //----------------------------------------------------------------- | |
116 | // This function compares tracks according to the their curvature | |
117 | //----------------------------------------------------------------- | |
118 | AliITStrackV2 *t=(AliITStrackV2*)o; | |
119 | ||
120 | Double_t p2=1./(Get1Pt()*Get1Pt()); | |
121 | Double_t b2=p2/(p2 + GetMass()*GetMass()); | |
122 | Double_t po2=1./(t->Get1Pt()*t->Get1Pt()); | |
123 | Double_t bo2=po2/(po2 + t->GetMass()*t->GetMass()); | |
124 | if (p2*b2>po2*bo2) return -1; | |
125 | else if (p2*b2<po2*bo2) return 1; | |
126 | return 0; | |
127 | } | |
006b5f7f | 128 | |
129 | //_____________________________________________________________________________ | |
130 | void AliITStrackV2::GetExternalCovariance(Double_t cc[15]) const { | |
131 | //------------------------------------------------------------------------- | |
132 | // This function returns an external representation of the covriance matrix. | |
133 | // (See comments in AliTPCtrack.h about external track representation) | |
134 | //------------------------------------------------------------------------- | |
9b280d80 | 135 | Double_t a=GetConvConst(); |
006b5f7f | 136 | |
137 | cc[0 ]=fC00; | |
138 | cc[1 ]=fC10; cc[2 ]=fC11; | |
139 | cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22; | |
140 | cc[6 ]=fC30; cc[7 ]=fC31; cc[8 ]=fC32; cc[9 ]=fC33; | |
141 | cc[10]=fC40*a; cc[11]=fC41*a; cc[12]=fC42*a; cc[13]=fC43*a; cc[14]=fC44*a*a; | |
142 | } | |
143 | ||
144 | //____________________________________________________________________________ | |
7f6ddf58 | 145 | Int_t AliITStrackV2::PropagateToVertex(Double_t x0,Double_t rho) { |
006b5f7f | 146 | //------------------------------------------------------------------ |
147 | //This function propagates a track to the minimal distance from the origin | |
148 | //------------------------------------------------------------------ | |
149 | Double_t xv=fP2*(fX*fP2 - fP0*TMath::Sqrt(1.- fP2*fP2)); //linear approxim. | |
7f6ddf58 | 150 | Propagate(fAlpha,xv,0.,0.); |
006b5f7f | 151 | return 0; |
152 | } | |
153 | ||
154 | //____________________________________________________________________________ | |
155 | Int_t AliITStrackV2:: | |
156 | GetGlobalXYZat(Double_t xk, Double_t &x, Double_t &y, Double_t &z) const { | |
157 | //------------------------------------------------------------------ | |
158 | //This function returns a track position in the global system | |
159 | //------------------------------------------------------------------ | |
160 | Double_t dx=xk-fX; | |
161 | Double_t f1=fP2, f2=f1 + fP4*dx; | |
162 | if (TMath::Abs(f2) >= 0.99999) { | |
7f6ddf58 | 163 | Int_t n=GetNumberOfClusters(); |
164 | if (n>kWARN) | |
165 | cerr<<n<<" AliITStrackV2::GetGlobalXYZat: Propagation failed !\n"; | |
006b5f7f | 166 | return 0; |
167 | } | |
168 | ||
169 | Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2); | |
170 | ||
171 | Double_t yk = fP0 + dx*(f1+f2)/(r1+r2); | |
172 | Double_t zk = fP1 + dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; | |
173 | ||
174 | Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha); | |
175 | x = xk*cs - yk*sn; | |
176 | y = xk*sn + yk*cs; | |
177 | z = zk; | |
178 | ||
179 | return 1; | |
180 | } | |
181 | ||
182 | //_____________________________________________________________________________ | |
183 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const | |
184 | { | |
185 | //----------------------------------------------------------------- | |
186 | // This function calculates a predicted chi2 increment. | |
187 | //----------------------------------------------------------------- | |
188 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2(); | |
189 | r00+=fC00; r01+=fC10; r11+=fC11; | |
190 | ||
191 | Double_t det=r00*r11 - r01*r01; | |
7f6ddf58 | 192 | if (TMath::Abs(det) < 1.e-30) { |
006b5f7f | 193 | Int_t n=GetNumberOfClusters(); |
7f6ddf58 | 194 | if (n>kWARN) |
195 | cerr<<n<<" AliKalmanTrack::GetPredictedChi2: Singular matrix !\n"; | |
006b5f7f | 196 | return 1e10; |
197 | } | |
198 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
199 | ||
200 | Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1; | |
201 | ||
202 | return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; | |
203 | } | |
204 | ||
205 | //_____________________________________________________________________________ | |
206 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c,Double_t *m, | |
7f6ddf58 | 207 | Double_t x0) const { |
006b5f7f | 208 | //----------------------------------------------------------------- |
209 | // This function calculates a chi2 increment with a vertex contraint | |
210 | //----------------------------------------------------------------- | |
211 | TVectorD x(5); x(0)=fP0; x(1)=fP1; x(2)=fP2; x(3)=fP3; x(4)=fP4; | |
212 | TMatrixD C(5,5); | |
213 | C(0,0)=fC00; | |
214 | C(1,0)=fC10; C(1,1)=fC11; | |
215 | C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22; | |
216 | C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33; | |
217 | C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44; | |
218 | ||
219 | C(0,1)=C(1,0); | |
220 | C(0,2)=C(2,0); C(1,2)=C(2,1); | |
221 | C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2); | |
222 | C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3); | |
223 | ||
224 | TMatrixD H(4,5); H.UnitMatrix(); | |
225 | Double_t dy=(c->GetY() - m[0]), dz=(c->GetZ() - m[1]); | |
226 | ||
227 | Double_t dr=TMath::Sqrt(fX*fX + dy*dy); | |
228 | Double_t r =TMath::Sqrt(4/dr/dr - fP4*fP4); | |
229 | Double_t sn=0.5*(fP4*fX + dy*r); | |
230 | Double_t tg=0.5*fP4*dz/TMath::ASin(0.5*fP4*dr); | |
231 | TVectorD mm(4); | |
232 | mm(0)=m[0]=c->GetY(); mm(1)=m[1]=c->GetZ(); mm(2)=m[2]=sn; mm(3)=m[3]=tg; | |
233 | ||
234 | Double_t v22=0.,v33=0.; | |
235 | //x0=0.; | |
236 | if (x0!=0.) { | |
237 | Double_t pp2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
7f6ddf58 | 238 | Double_t beta2=pp2/(pp2 + GetMass()*GetMass()); |
006b5f7f | 239 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); |
240 | Double_t theta2=14.1*14.1/(beta2*pp2*1e6)*x0; | |
241 | v22 = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl()); | |
242 | v33 = theta2*(1.+ GetTgl()*GetTgl())*(1. + GetTgl()*GetTgl()); | |
243 | } | |
244 | Double_t sy2=c->GetSigmaY2(), sz2=c->GetSigmaZ2(); | |
245 | v22+=kSigmaYV*kSigmaYV/dr/dr; | |
246 | v22+=sy2/dr/dr; | |
247 | Double_t v20=sy2/dr; | |
248 | ||
249 | v33+=kSigmaZV*kSigmaZV/dr/dr; | |
250 | v33+=sz2/dr/dr; | |
251 | Double_t v31=sz2/dr; | |
252 | ||
253 | TMatrixD V(4,4); | |
254 | V(0,0)=m[4 ]=sy2; V(0,1)=m[5 ]=0.; V(0,2)=m[6 ]=v20; V(0,3)=m[7 ]=0.; | |
255 | V(1,0)=m[8 ]=0.; V(1,1)=m[9 ]=sz2; V(1,2)=m[10]=0.; V(1,3)=m[11]=v31; | |
256 | V(2,0)=m[12]=v20; V(2,1)=m[13]=0.; V(2,2)=m[14]=v22; V(2,3)=m[15]=0.; | |
257 | V(3,0)=m[16]=0.; V(3,1)=m[17]=v31; V(3,2)=m[18]=0.; V(3,3)=m[19]=v33; | |
258 | ||
259 | TVectorD res=x; res*=H; res-=mm; //res*=-1; | |
260 | TMatrixD tmp(H,TMatrixD::kMult,C); | |
261 | TMatrixD R(tmp,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed,H)); R+=V; | |
262 | ||
263 | Double_t det=R.Determinant(); | |
7f6ddf58 | 264 | if (TMath::Abs(det) < 1.e-30) { |
006b5f7f | 265 | Int_t n=GetNumberOfClusters(); |
7f6ddf58 | 266 | if (n>kWARN) |
267 | cerr<<n<<" AliITStrackV2::GetPredictedChi2: Singular matrix !\n"; | |
006b5f7f | 268 | return 1e10; |
269 | } | |
270 | ||
271 | R.Invert(); | |
272 | ||
273 | TVectorD rs=res; | |
274 | res*=R; | |
275 | return rs*res; | |
276 | } | |
277 | ||
278 | //____________________________________________________________________________ | |
279 | Int_t | |
7f6ddf58 | 280 | AliITStrackV2::PropagateTo(Double_t xk,Double_t x0,Double_t rho) { |
006b5f7f | 281 | //------------------------------------------------------------------ |
282 | //This function propagates a track | |
283 | //------------------------------------------------------------------ | |
284 | Double_t x1=fX, x2=xk, dx=x2-x1; | |
285 | Double_t f1=fP2, f2=f1 + fP4*dx; | |
286 | if (TMath::Abs(f2) >= 0.99999) { | |
287 | Int_t n=GetNumberOfClusters(); | |
7f6ddf58 | 288 | if (n>kWARN) |
289 | cerr<<n<<" AliITStrackV2::PropagateTo: Propagation failed !\n"; | |
006b5f7f | 290 | return 0; |
291 | } | |
292 | ||
293 | Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2); | |
294 | ||
295 | fP0 += dx*(f1+f2)/(r1+r2); | |
296 | fP1 += dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; | |
297 | fP2 += dx*fP4; | |
298 | ||
299 | //f = F - 1 | |
300 | ||
301 | Double_t f02= dx/(r1*r1*r1); | |
302 | Double_t f04=0.5*dx*dx/(r1*r1*r1); | |
303 | Double_t f12= dx*fP3*f1/(r1*r1*r1); | |
304 | Double_t f14=0.5*dx*dx*fP3*f1/(r1*r1*r1); | |
305 | Double_t f13= dx/r1; | |
306 | Double_t f24= dx; | |
307 | ||
308 | //b = C*ft | |
309 | Double_t b00=f02*fC20 + f04*fC40, b01=f12*fC20 + f14*fC40 + f13*fC30; | |
310 | Double_t b02=f24*fC40; | |
311 | Double_t b10=f02*fC21 + f04*fC41, b11=f12*fC21 + f14*fC41 + f13*fC31; | |
312 | Double_t b12=f24*fC41; | |
313 | Double_t b20=f02*fC22 + f04*fC42, b21=f12*fC22 + f14*fC42 + f13*fC32; | |
314 | Double_t b22=f24*fC42; | |
315 | Double_t b40=f02*fC42 + f04*fC44, b41=f12*fC42 + f14*fC44 + f13*fC43; | |
316 | Double_t b42=f24*fC44; | |
317 | Double_t b30=f02*fC32 + f04*fC43, b31=f12*fC32 + f14*fC43 + f13*fC33; | |
318 | Double_t b32=f24*fC43; | |
319 | ||
320 | //a = f*b = f*C*ft | |
321 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a02=f02*b22+f04*b42; | |
322 | Double_t a11=f12*b21+f14*b41+f13*b31,a12=f12*b22+f14*b42+f13*b32; | |
323 | Double_t a22=f24*b42; | |
324 | ||
325 | //F*C*Ft = C + (b + bt + a) | |
326 | fC00 += b00 + b00 + a00; | |
327 | fC10 += b10 + b01 + a01; | |
328 | fC20 += b20 + b02 + a02; | |
329 | fC30 += b30; | |
330 | fC40 += b40; | |
331 | fC11 += b11 + b11 + a11; | |
332 | fC21 += b21 + b12 + a12; | |
333 | fC31 += b31; | |
334 | fC41 += b41; | |
335 | fC22 += b22 + b22 + a22; | |
336 | fC32 += b32; | |
337 | fC42 += b42; | |
338 | ||
339 | fX=x2; | |
340 | ||
341 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
7f6ddf58 | 342 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
006b5f7f | 343 | |
344 | //Multiple scattering****************** | |
345 | //x0=0.; | |
346 | if (x0!=0) { | |
347 | x0*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); | |
348 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; | |
349 | fC22 += theta2*(1.- fP2*fP2)*(1. + fP3*fP3); | |
350 | fC33 += theta2*(1. + fP3*fP3)*(1. + fP3*fP3); | |
351 | fC43 += theta2*fP3*fP4*(1. + fP3*fP3); | |
352 | fC44 += theta2*fP3*fP4*fP3*fP4; | |
353 | } | |
354 | ||
355 | //Energy losses************************ | |
356 | if (rho!=0.) { | |
357 | rho*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); | |
358 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*rho; | |
359 | if (x1 < x2) dE=-dE; | |
7f6ddf58 | 360 | fP4*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); |
006b5f7f | 361 | } |
362 | ||
363 | if (!Invariant()) {cout<<"Propagate !\n"; return 0;} | |
364 | ||
365 | return 1; | |
366 | } | |
367 | ||
368 | //____________________________________________________________________________ | |
369 | Int_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, UInt_t index) { | |
370 | //------------------------------------------------------------------ | |
371 | //This function updates track parameters | |
372 | //------------------------------------------------------------------ | |
373 | Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4; | |
374 | Double_t c00=fC00; | |
375 | Double_t c10=fC10, c11=fC11; | |
376 | Double_t c20=fC20, c21=fC21, c22=fC22; | |
377 | Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33; | |
378 | Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44; | |
379 | ||
380 | ||
381 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2(); | |
382 | r00+=fC00; r01+=fC10; r11+=fC11; | |
383 | Double_t det=r00*r11 - r01*r01; | |
384 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
385 | ||
386 | Double_t k00=fC00*r00+fC10*r01, k01=fC00*r01+fC10*r11; | |
387 | Double_t k10=fC10*r00+fC11*r01, k11=fC10*r01+fC11*r11; | |
388 | Double_t k20=fC20*r00+fC21*r01, k21=fC20*r01+fC21*r11; | |
389 | Double_t k30=fC30*r00+fC31*r01, k31=fC30*r01+fC31*r11; | |
390 | Double_t k40=fC40*r00+fC41*r01, k41=fC40*r01+fC41*r11; | |
391 | ||
392 | Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1; | |
393 | Double_t sf=fP2 + k20*dy + k21*dz; | |
7f6ddf58 | 394 | |
006b5f7f | 395 | fP0 += k00*dy + k01*dz; |
396 | fP1 += k10*dy + k11*dz; | |
397 | fP2 = sf; | |
398 | fP3 += k30*dy + k31*dz; | |
399 | fP4 += k40*dy + k41*dz; | |
400 | ||
401 | Double_t c01=fC10, c02=fC20, c03=fC30, c04=fC40; | |
402 | Double_t c12=fC21, c13=fC31, c14=fC41; | |
403 | ||
404 | fC00-=k00*fC00+k01*fC10; fC10-=k00*c01+k01*fC11; | |
405 | fC20-=k00*c02+k01*c12; fC30-=k00*c03+k01*c13; | |
406 | fC40-=k00*c04+k01*c14; | |
407 | ||
408 | fC11-=k10*c01+k11*fC11; | |
409 | fC21-=k10*c02+k11*c12; fC31-=k10*c03+k11*c13; | |
410 | fC41-=k10*c04+k11*c14; | |
411 | ||
412 | fC22-=k20*c02+k21*c12; fC32-=k20*c03+k21*c13; | |
413 | fC42-=k20*c04+k21*c14; | |
414 | ||
415 | fC33-=k30*c03+k31*c13; | |
416 | fC43-=k30*c04+k31*c14; | |
417 | ||
418 | fC44-=k40*c04+k41*c14; | |
419 | ||
420 | if (!Invariant()) { | |
421 | fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4; | |
422 | fC00=c00; | |
423 | fC10=c10; fC11=c11; | |
424 | fC20=c20; fC21=c21; fC22=c22; | |
425 | fC30=c30; fC31=c31; fC32=c32; fC33=c33; | |
426 | fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | Int_t n=GetNumberOfClusters(); | |
431 | fIndex[n]=index; | |
432 | SetNumberOfClusters(n+1); | |
433 | SetChi2(GetChi2()+chi2); | |
434 | ||
435 | return 1; | |
436 | } | |
437 | ||
438 | ||
439 | //____________________________________________________________________________ | |
440 | Int_t AliITStrackV2::Update(const Double_t* m, Double_t chi2, UInt_t index) { | |
441 | //------------------------------------------------------------------ | |
442 | //This function updates track parameters with a vertex constraint | |
443 | //------------------------------------------------------------------ | |
444 | Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4; | |
445 | Double_t c00=fC00; | |
446 | Double_t c10=fC10, c11=fC11; | |
447 | Double_t c20=fC20, c21=fC21, c22=fC22; | |
448 | Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33; | |
449 | Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44; | |
450 | ||
451 | ||
452 | TVectorD x(5); x(0)=fP0; x(1)=fP1; x(2)=fP2; x(3)=fP3; x(4)=fP4; | |
453 | TMatrixD C(5,5); | |
454 | C(0,0)=fC00; | |
455 | C(1,0)=fC10; C(1,1)=fC11; | |
456 | C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22; | |
457 | C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33; | |
458 | C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44; | |
459 | ||
460 | C(0,1)=C(1,0); | |
461 | C(0,2)=C(2,0); C(1,2)=C(2,1); | |
462 | C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2); | |
463 | C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3); | |
464 | ||
465 | TMatrixD H(4,5); H.UnitMatrix(); | |
466 | TMatrixD Ht(TMatrixD::kTransposed,H); | |
467 | TVectorD mm(4); mm(0)=m[0]; mm(1)=m[1]; mm(2)=m[2]; mm(3)=m[3]; | |
468 | TMatrixD V(4,4); | |
469 | V(0,0)=m[4 ]; V(0,1)=m[5 ]; V(0,2)=m[6 ]; V(0,3)=m[7 ]; | |
470 | V(1,0)=m[8 ]; V(1,1)=m[9 ]; V(1,2)=m[10]; V(1,3)=m[11]; | |
471 | V(2,0)=m[12]; V(2,1)=m[13]; V(2,2)=m[14]; V(2,3)=m[15]; | |
472 | V(3,0)=m[16]; V(3,1)=m[17]; V(3,2)=m[18]; V(3,3)=m[19]; | |
473 | ||
474 | TMatrixD tmp(H,TMatrixD::kMult,C); | |
475 | TMatrixD R(tmp,TMatrixD::kMult,Ht); R+=V; | |
476 | ||
477 | R.Invert(); | |
478 | ||
479 | TMatrixD K(C,TMatrixD::kMult,Ht); K*=R; | |
480 | ||
481 | TVectorD savex=x; | |
482 | x*=H; x-=mm; x*=-1; x*=K; x+=savex; | |
483 | ||
484 | TMatrixD saveC=C; | |
485 | C.Mult(K,tmp); C-=saveC; C*=-1; | |
486 | ||
487 | fP0=x(0); fP1=x(1); fP2=x(2); fP3=x(3); fP4=x(4); | |
488 | fC00=C(0,0); | |
489 | fC10=C(1,0); fC11=C(1,1); | |
490 | fC20=C(2,0); fC21=C(2,1); fC22=C(2,2); | |
491 | fC30=C(3,0); fC31=C(3,1); fC32=C(3,2); fC33=C(3,3); | |
492 | fC40=C(4,0); fC41=C(4,1); fC42=C(4,2); fC43=C(4,3); fC44=C(4,4); | |
493 | ||
494 | ||
495 | if (!Invariant()) { | |
496 | fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4; | |
497 | fC00=c00; | |
498 | fC10=c10; fC11=c11; | |
499 | fC20=c20; fC21=c21; fC22=c22; | |
500 | fC30=c30; fC31=c31; fC32=c32; fC33=c33; | |
501 | fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44; | |
502 | return 0; | |
503 | } | |
504 | ||
505 | Int_t n=GetNumberOfClusters(); | |
506 | fIndex[n]=index; | |
507 | SetNumberOfClusters(n+1); | |
508 | SetChi2(GetChi2()+chi2); | |
509 | ||
510 | return 1; | |
511 | } | |
512 | ||
513 | Int_t AliITStrackV2::Invariant() const { | |
514 | //------------------------------------------------------------------ | |
515 | // This function is for debugging purpose only | |
516 | //------------------------------------------------------------------ | |
7f6ddf58 | 517 | Int_t n=GetNumberOfClusters(); |
518 | ||
006b5f7f | 519 | //if (TMath::Abs(fP1)>11.5) |
7f6ddf58 | 520 | //if (fP1*fP4<0) { |
23efe5f1 | 521 | // if (n>kWARN) cerr<<"fP1*fP4="<<fP1*fP4<<' '<<fP1<<endl; return 0;} |
7f6ddf58 | 522 | |
23efe5f1 | 523 | if (TMath::Abs(fP2)>=1) {if (n>kWARN) cerr<<"fP2="<<fP2<<endl; return 0;} |
7f6ddf58 | 524 | |
23efe5f1 | 525 | if (fC00<=0) {if (n>kWARN) cerr<<"fC00="<<fC00<<endl; return 0;} |
526 | if (fC11<=0) {if (n>kWARN) cerr<<"fC11="<<fC11<<endl; return 0;} | |
527 | if (fC22<=0) {if (n>kWARN) cerr<<"fC22="<<fC22<<endl; return 0;} | |
528 | if (fC33<=0) {if (n>kWARN) cerr<<"fC33="<<fC33<<endl; return 0;} | |
529 | if (fC44<=0) {if (n>kWARN) cerr<<"fC44="<<fC44<<endl; return 0;} | |
14825d5a | 530 | /* |
531 | TMatrixD m(5,5); | |
532 | m(0,0)=fC00; | |
533 | m(1,0)=fC10; m(1,1)=fC11; | |
534 | m(2,0)=fC20; m(2,1)=fC21; m(2,2)=fC22; | |
535 | m(3,0)=fC30; m(3,1)=fC31; m(3,2)=fC32; m(3,3)=fC33; | |
536 | m(4,0)=fC40; m(4,1)=fC41; m(4,2)=fC42; m(4,3)=fC43; m(4,4)=fC44; | |
537 | ||
538 | m(0,1)=m(1,0); | |
539 | m(0,2)=m(2,0); m(1,2)=m(2,1); | |
540 | m(0,3)=m(3,0); m(1,3)=m(3,1); m(2,3)=m(3,2); | |
541 | m(0,4)=m(4,0); m(1,4)=m(4,1); m(2,4)=m(4,2); m(3,4)=m(4,3); | |
542 | ||
543 | Double_t det=m.Determinant(); | |
544 | ||
545 | if (det <= 0) { | |
23efe5f1 | 546 | if (n>kWARN) { cerr<<" bad determinant "<<det<<endl; m.Print(); } |
14825d5a | 547 | return 0; |
548 | } | |
549 | */ | |
550 | return 1; | |
006b5f7f | 551 | } |
552 | ||
553 | //____________________________________________________________________________ | |
7f6ddf58 | 554 | Int_t |
555 | AliITStrackV2::Propagate(Double_t alp,Double_t xk,Double_t x0,Double_t rho) { | |
006b5f7f | 556 | //------------------------------------------------------------------ |
557 | //This function propagates a track | |
558 | //------------------------------------------------------------------ | |
559 | Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4; | |
560 | Double_t c00=fC00; | |
561 | Double_t c10=fC10, c11=fC11; | |
562 | Double_t c20=fC20, c21=fC21, c22=fC22; | |
563 | Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33; | |
564 | Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44; | |
565 | ||
566 | ||
567 | Double_t dalp=alp-fAlpha; | |
568 | ||
569 | Double_t ca=TMath::Cos(dalp), sa=TMath::Sin(dalp); | |
570 | Double_t sf=fP2, cf=TMath::Sqrt(1.- fP2*fP2); | |
571 | ||
572 | Double_t pp2=fP2*ca - cf*sa; | |
573 | if (TMath::Abs(pp2) >= 0.99999) { | |
574 | Int_t n=GetNumberOfClusters(); | |
7f6ddf58 | 575 | if (n>kWARN) |
576 | cerr<<n<<" AliITStrackV2::Propagate: Rotation failed !\n"; | |
006b5f7f | 577 | return 0; |
578 | } | |
579 | ||
580 | fAlpha = alp; | |
581 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
582 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
583 | ||
584 | Double_t x1=fX, y1=fP0; | |
585 | ||
586 | fX = x1*ca + y1*sa; | |
587 | fP0=-x1*sa + y1*ca; | |
588 | fP2 = pp2; | |
589 | ||
590 | cf=ca + sf*sa/cf; | |
591 | ||
592 | if (!Invariant()) {cout<<dalp<<" Rotate !\n"; return 0;} | |
593 | ||
594 | x1=fX; Double_t x2=xk, dx=x2-x1; | |
595 | Double_t f1=fP2, f2=f1 + fP4*dx; | |
596 | if (TMath::Abs(f2) >= 0.99999) { | |
597 | Int_t n=GetNumberOfClusters(); | |
7f6ddf58 | 598 | if (n>kWARN) |
599 | cerr<<n<<" AliITStrackV2::Propagate: Propagation failed !\n"; | |
006b5f7f | 600 | return 0; |
601 | } | |
602 | ||
603 | Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2); | |
604 | ||
605 | fP0 += dx*(f1+f2)/(r1+r2); | |
606 | fP1 += dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; | |
607 | fP2 += dx*fP4; | |
608 | ||
609 | //f = F - 1 | |
610 | Double_t f02= dx/(r1*r1*r1); | |
611 | Double_t f04=0.5*dx*dx/(r1*r1*r1); | |
612 | Double_t f12= dx*fP3*f1/(r1*r1*r1); | |
613 | Double_t f14=0.5*dx*dx*fP3*f1/(r1*r1*r1); | |
614 | Double_t f13= dx/r1; | |
615 | Double_t f24= dx; | |
616 | /* | |
617 | //b = C*ft | |
618 | Double_t b00=f02*fC20 + f03*fC30, b01=f12*fC20 + f13*fC30 + f14*fC40; | |
619 | Double_t b02=f23*fC30; | |
620 | Double_t b10=f02*fC21 + f03*fC31, b11=f12*fC21 + f13*fC31 + f14*fC41; | |
621 | Double_t b12=f23*fC31; | |
622 | Double_t b20=f02*fC22 + f03*fC32, b21=f12*fC22 + f13*fC32 + f14*fC42; | |
623 | Double_t b22=f23*fC32; | |
624 | Double_t b30=f02*fC32 + f03*fC33, b31=f12*fC32 + f13*fC33 + f14*fC43; | |
625 | Double_t b32=f23*fC33; | |
626 | Double_t b40=f02*fC42 + f03*fC43, b41=f12*fC42 + f13*fC43 + f14*fC44; | |
627 | Double_t b42=f23*fC43; | |
628 | ||
629 | //a = f*b = f*C*ft | |
630 | Double_t a00=f02*b20+f03*b30,a01=f02*b21+f03*b31,a02=f02*b22+f03*b32; | |
631 | Double_t a11=f12*b21+f13*b31+f14*b41,a12=f12*b22+f13*b32+f14*b42; | |
632 | Double_t a22=f23*b32; | |
633 | ||
634 | //F*C*Ft = C + (b + bt + a) | |
635 | fC00 += b00 + b00 + a00; | |
636 | fC10 += b10 + b01 + a01; | |
637 | fC20 += b20 + b02 + a02; | |
638 | fC30 += b30; | |
639 | fC40 += b40; | |
640 | fC11 += b11 + b11 + a11; | |
641 | fC21 += b21 + b12 + a12; | |
642 | fC31 += b31; | |
643 | fC41 += b41; | |
644 | fC22 += b22 + b22 + a22; | |
645 | fC32 += b32; | |
646 | fC42 += b42; | |
647 | */ | |
648 | ||
649 | TMatrixD F(5,5); F.UnitMatrix(); | |
650 | F(0,0)=-(f1+f2)/(r1+r2)*sa + ca; F(0,2)=f02*cf; F(0,4)=f04; | |
651 | F(1,0)=-(f1+f2)/(f1*r2 + f2*r1)*fP3*sa; F(1,2)=f12*cf; F(1,4)=f14; F(1,3)=f13; | |
652 | F(2,0)=-fP4*sa; F(2,2)=cf; F(2,4)=f24; | |
653 | ||
654 | TMatrixD C(5,5); | |
655 | C(0,0)=fC00; | |
656 | C(1,0)=fC10; C(1,1)=fC11; | |
657 | C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22; | |
658 | C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33; | |
659 | C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44; | |
660 | ||
661 | C(0,1)=C(1,0); | |
662 | C(0,2)=C(2,0); C(1,2)=C(2,1); | |
663 | C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2); | |
664 | C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3); | |
665 | ||
666 | TMatrixD tmp(C,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed, F)); | |
667 | C.Mult(F,tmp); | |
668 | ||
669 | fC00=C(0,0); | |
670 | fC10=C(1,0); fC11=C(1,1); | |
671 | fC20=C(2,0); fC21=C(2,1); fC22=C(2,2); | |
672 | fC30=C(3,0); fC31=C(3,1); fC32=C(3,2); fC33=C(3,3); | |
673 | fC40=C(4,0); fC41=C(4,1); fC42=C(4,2); fC43=C(4,3); fC44=C(4,4); | |
674 | ||
675 | pp2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
7f6ddf58 | 676 | Double_t beta2=pp2/(pp2 + GetMass()*GetMass()); |
006b5f7f | 677 | |
678 | //Multiple scattering****************** | |
679 | //x0=0.; | |
680 | if (x0!=0.) { | |
681 | x0*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); | |
682 | Double_t theta2=14.1*14.1/(beta2*pp2*1e6)*x0; | |
683 | fC22 += theta2*(1.- fP2*fP2)*(1. + fP3*fP3); | |
684 | fC33 += theta2*(1. + fP3*fP3)*(1. + fP3*fP3); | |
685 | fC43 += theta2*fP3*fP4*(1. + fP3*fP3); | |
686 | fC44 += theta2*fP3*fP4*fP3*fP4; | |
687 | } | |
688 | ||
689 | //Energy losses************************ | |
690 | if (rho!=0.) { | |
691 | rho*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); | |
692 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*rho; | |
693 | if (x1 < x2) dE=-dE; | |
7f6ddf58 | 694 | fP4*=(1.- sqrt(pp2+GetMass()*GetMass())/pp2*dE); |
006b5f7f | 695 | } |
696 | ||
697 | if (!Invariant()) { | |
698 | fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4; | |
699 | fC00=c00; | |
700 | fC10=c10; fC11=c11; | |
701 | fC20=c20; fC21=c21; fC22=c22; | |
702 | fC30=c30; fC31=c31; fC32=c32; fC33=c33; | |
703 | fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | fX=x2; | |
708 | ||
709 | return 1; | |
710 | } | |
711 | ||
712 | Double_t AliITStrackV2::GetD() const { | |
713 | //------------------------------------------------------------------ | |
714 | //This function calculates the transverse impact parameter | |
715 | //------------------------------------------------------------------ | |
716 | Double_t sn=fP4*fX - fP2, cs=fP4*fP0 + TMath::Sqrt(1.- fP2*fP2); | |
717 | Double_t a=2*(fX*fP2 - fP0*TMath::Sqrt(1.- fP2*fP2))-fP4*(fX*fX + fP0*fP0); | |
718 | if (fP4<0) a=-a; | |
719 | return a/(1 + TMath::Sqrt(sn*sn + cs*cs)); | |
720 | } | |
721 | ||
722 | ||
723 | Int_t AliITStrackV2::Improve(Double_t x0,Double_t yv,Double_t zv) { | |
724 | //------------------------------------------------------------------ | |
725 | //This function improves angular track parameters | |
726 | //------------------------------------------------------------------ | |
727 | Double_t dy=fP0-yv, dz=fP1-zv; | |
728 | Double_t r2=fX*fX+dy*dy; | |
729 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
7f6ddf58 | 730 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
006b5f7f | 731 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); |
732 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; | |
733 | ||
734 | Double_t par=0.5*(fP4*fX + dy*TMath::Sqrt(4/r2-fP4*fP4)); | |
735 | Double_t sigma2 = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl()); | |
736 | sigma2 += fC00/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2); | |
737 | sigma2 += kSigmaYV*kSigmaYV/r2; | |
738 | sigma2 += 0.25*fC44*fX*fX; | |
739 | Double_t eps2=sigma2/(fC22+sigma2), eps=TMath::Sqrt(eps2); | |
740 | if (10*r2*fC44<fC22) { | |
741 | fP2 = eps2*fP2 + (1-eps2)*par; | |
742 | fC22*=eps2; fC21*=eps; fC20*=eps; fC32*=eps; fC42*=eps; | |
743 | } | |
744 | ||
745 | par=0.5*fP4*dz/TMath::ASin(0.5*fP4*TMath::Sqrt(r2)); | |
746 | sigma2=theta2; | |
747 | sigma2 += fC11/r2+fC00*dy*dy*dz*dz/(r2*r2*r2); | |
748 | sigma2 += kSigmaZV*kSigmaZV/r2; | |
749 | eps2=sigma2/(fC33+sigma2); eps=TMath::Sqrt(eps2); | |
750 | Double_t tgl=fP3; | |
751 | fP3 = eps2*fP3 + (1-eps2)*par; | |
752 | fC33*=eps2; fC32*=eps; fC31*=eps; fC30*=eps; fC43*=eps; | |
753 | ||
754 | eps=TMath::Sqrt((1+fP3*fP3)/(1+tgl*tgl)); | |
755 | fP4*=eps; | |
756 | fC44*=eps*eps; fC43*=eps;fC42*=eps; fC41*=eps; fC40*=eps; | |
757 | ||
758 | if (!Invariant()) return 0; | |
759 | return 1; | |
760 | } | |
761 | ||
762 | /* | |
763 | Int_t AliITStrackV2::Improve(Double_t x0,Double_t xv,Double_t yv) { | |
764 | //------------------------------------------------------------------ | |
765 | //This function improves angular track parameters | |
766 | //------------------------------------------------------------------ | |
767 | TMatrixD I(5,5); | |
768 | TVectorD v(5); v(0)=fP0; v(1)=fP1; v(2)=fP2; v(3)=fP3; v(4)=fP4; | |
769 | ||
770 | Double_t r2=fX*fX+fP0*fP0; | |
771 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
7f6ddf58 | 772 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
006b5f7f | 773 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); |
774 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; | |
775 | ||
776 | v(2)=0.5*(fP4*fX + fP0*TMath::Sqrt(4/r2-fP4*fP4)); | |
777 | Double_t sigma2 = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl()); | |
778 | sigma2 += fC00/r2*(1.- fP0*fP0/r2)*(1.- fP0*fP0/r2); | |
779 | sigma2 += kSigmaYV*kSigmaYV/r2; | |
780 | I(2,2)=1/sigma2; | |
781 | ||
782 | v(3)=0.5*fP4*fP1/TMath::ASin(0.5*fP4*TMath::Sqrt(r2)); | |
783 | sigma2=theta2; | |
784 | sigma2 += fC11/r2+fC00*fP0*fP0*fP1*fP1/(r2*r2*r2); | |
785 | sigma2 += kSigmaZV*kSigmaZV/r2; | |
786 | I(3,3)=1/sigma2; | |
787 | ||
788 | Double_t tgl=fP3; | |
789 | ||
790 | TVectorD x(5); x(0)=fP0; x(1)=fP1; x(2)=fP2; x(3)=fP3; x(4)=fP4; | |
791 | TMatrixD C(5,5); | |
792 | C(0,0)=fC00; | |
793 | C(1,0)=fC10; C(1,1)=fC11; | |
794 | C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22; | |
795 | C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33; | |
796 | C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44; | |
797 | ||
798 | C(0,1)=C(1,0); | |
799 | C(0,2)=C(2,0); C(1,2)=C(2,1); | |
800 | C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2); | |
801 | C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3); | |
802 | ||
803 | TMatrixD tmp(I,TMatrixD::kMult,C),U(5,5); U.UnitMatrix(); | |
804 | U+=tmp; | |
805 | U.Invert(); | |
806 | TMatrixD W1(U); | |
807 | TMatrixD W2(tmp,TMatrixD::kMult,W1); | |
808 | ||
809 | v*=W2; x*=W1; x+=v; | |
810 | ||
811 | C*=W1; | |
812 | ||
813 | ||
814 | fP0=x(0); fP1=x(1); fP2=x(2); fP3=x(3); fP4=x(4); | |
815 | fC00=C(0,0); | |
816 | fC10=C(1,0); fC11=C(1,1); | |
817 | fC20=C(2,0); fC21=C(2,1); fC22=C(2,2); | |
818 | fC30=C(3,0); fC31=C(3,1); fC32=C(3,2); fC33=C(3,3); | |
819 | fC40=C(4,0); fC41=C(4,1); fC42=C(4,2); fC43=C(4,3); fC44=C(4,4); | |
820 | ||
821 | eps=TMath::Sqrt((1+fP3*fP3)/(1+tgl*tgl)); | |
822 | fP4*=eps; | |
823 | fC44*=eps*eps; fC43*=eps;fC42*=eps; fC41*=eps; fC40*=eps; | |
824 | ||
825 | if (!Invariant()) return 0; | |
826 | return 1; | |
827 | } | |
828 | */ | |
829 | ||
14825d5a | 830 | void AliITStrackV2::ResetCovariance() { |
831 | //------------------------------------------------------------------ | |
832 | //This function makes a track forget its history :) | |
833 | //------------------------------------------------------------------ | |
834 | ||
835 | fC00*=10.; | |
836 | fC10=0.; fC11*=10.; | |
837 | fC20=0.; fC21=0.; fC22*=10.; | |
838 | fC30=0.; fC31=0.; fC32=0.; fC33*=10.; | |
839 | fC40=0.; fC41=0.; fC42=0.; fC43=0.; fC44*=10.; | |
840 | ||
841 | } | |
23efe5f1 | 842 | |
843 | void AliITStrackV2::CookdEdx(Double_t low, Double_t up) { | |
844 | //----------------------------------------------------------------- | |
845 | // This funtion calculates dE/dX within the "low" and "up" cuts. | |
846 | //----------------------------------------------------------------- | |
847 | Int_t i; | |
848 | Int_t nc=GetNumberOfClusters(); | |
849 | if(nc != 6) cout<<"!!!Warning: ncl isn't 6, ="<<nc<<endl; | |
850 | ||
851 | // The clusters order is: SSD-2, SSD-1, SDD-2, SDD-1, SPD-2, SPD-1 | |
852 | // Take only SSD and SDD | |
853 | nc=4; | |
854 | Int_t swap;//stupid sorting | |
855 | ||
856 | cout<<"Start sorting (low,up,nc)..."<<low<<" "<<up<<" "<<nc<<endl; | |
857 | ||
858 | /* | |
859 | for (i=0; i<6; i++) { // b.b. | |
860 | cout<<"! cl befor sort: cl,dEdx ="<<i<<","<<fdEdxSample[i]<<endl; | |
861 | } | |
862 | */ | |
863 | ||
864 | do { | |
865 | swap=0; | |
866 | for (i=0; i<nc-1; i++) { | |
867 | if (fdEdxSample[i]<=fdEdxSample[i+1]) continue; | |
868 | Float_t tmp=fdEdxSample[i]; | |
869 | fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp; | |
870 | swap++; | |
871 | } | |
872 | } while (swap); | |
873 | ||
874 | for (i=0; i<nc; i++) { // b.b. | |
875 | cout<<" i, sorted dEdx ="<<i<<","<<fdEdxSample[i]<<endl; | |
876 | } | |
877 | Int_t nl=Int_t(low*nc), nu=Int_t(up*(nc-1)); //b.b. to take two lowest dEdX | |
878 | // values from four ones choose | |
879 | // nu=2 | |
880 | ||
881 | cout<<" Cook: nl,nu, dEdX samples ="<<nl<<" "<<nu<<" "; | |
882 | Float_t dedx=0; | |
883 | for (i=nl; i<nu; i++){ | |
884 | dedx += fdEdxSample[i]; cout<<" "<<fdEdxSample[i]<<" ";} | |
885 | cout<<endl; | |
886 | dedx /= float(nu); | |
887 | ||
888 | cout<<"! CookdEdx end: dedx ="<<dedx<<endl; | |
889 | SetdEdx(dedx); | |
890 | } | |
891 | ||
892 |