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[u/mrichter/AliRoot.git] / ITS / AliITSTrackV1.cxx
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aecdf013 1// ITS Track Class
2//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
3// It contain all the usefull information for the track and the method to calculate, modify or extract them
4// The track is mainly caracterized by the state vector of elements (fX0, fX1, fX2, fX3, fX4) and the
5// corresponding covariance matrix of elements (C00, C10, ..... C44) that is triangular
6//
7#include <iostream.h>
8#include <TMath.h>
9#include <TVector.h>
10#include <TObjArray.h>
11#include "AliRun.h"
12#include "AliITSRad.h"
13#include "AliITSTrackV1.h"
14#include "AliGenerator.h"
a3894645 15#include "AliMagF.h"
aecdf013 16
17
18ClassImp(AliITSTrackV1)
19
20AliITSTrackV1::AliITSTrackV1() {
21//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
22// default constructor
23
55cd883f 24 fTPCtrack = 0;
aecdf013 25 fC00=fC10=fC11=fC20=fC21=fC22=fC30=fC31=fC32=fC33=fC40=fC41=fC42=fC43=fC44=0.;
26 flistCluster = new TObjArray;
27 fNumClustInTrack =0;
28 fChi2=-1;
29 flabel =0;
30 fVertex.ResizeTo(3);
31 fErrorVertex.ResizeTo(3);
32 fLayer = -1;
33 fClusterInTrack = new TMatrix(6,9);
b7a35fb7 34 Int_t i,j;
b7a35fb7 35 for(i=0; i<6; i++){
64ab0d55 36 for(j=0; j<9; j++) (*fClusterInTrack)(i,j)=-1.;
b7a35fb7 37 }
70a9314b 38 frtrack=0.;
39 fnoclust=0;
aecdf013 40 fd2.ResizeTo(6);
41 ftgl2.ResizeTo(6);
a3894645 42 fdtgl.ResizeTo(6);
61231d74 43 fMass=0.13956995; //a pion by default
a3894645 44
45//////////////////////////////////////// gets magnetic field factor ////////////////////////////////
46
47 AliMagF * fieldPointer = gAlice->Field();
48 fFieldFactor = (Double_t)fieldPointer->Factor();
49 //cout<< " field factor = "<<fFieldFactor<<"\n"; getchar();
50
51/////////////////////////////////////////////////////////////////////////////////////////////////////////
52
aecdf013 53}
54
55
56
57AliITSTrackV1::AliITSTrackV1(const AliITSTrackV1 &cobj) {
58//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
59// copy constructor
60
61 fClusterInTrack = new TMatrix(6,9);
b7a35fb7 62 Int_t i,j;
b7a35fb7 63 for(i=0; i<6; i++){
64ab0d55 64 for(j=0; j<9; j++) (*fClusterInTrack)(i,j)=-1.;
b7a35fb7 65 }
aecdf013 66 flistCluster = new TObjArray;
67 fVertex.ResizeTo(3);
68 fErrorVertex.ResizeTo(3);
69 fVertex = cobj.fVertex;
70 fErrorVertex = cobj.fErrorVertex;
71 flabel = cobj.flabel;
72 fLayer=cobj.fLayer;
73 fTPCtrack = cobj.fTPCtrack;
74 fNumClustInTrack = cobj.fNumClustInTrack;
75 fChi2= cobj.fChi2;
76 fX0=cobj.fX0; fX1=cobj.fX1; fX2=cobj.fX2; fX3=cobj.fX3; fX4=cobj.fX4;
77 frtrack=cobj.frtrack;
78 fDv=cobj.fDv;
79 fZv=cobj.fZv;
80 fsigmaDv=cobj.fsigmaDv;
81 fsigmaZv=cobj.fsigmaZv;
82 fd2.ResizeTo(6);
83 ftgl2.ResizeTo(6);
84 fdtgl.ResizeTo(6);
85 fd2=cobj.fd2;
86 ftgl2=cobj.ftgl2;
87 fdtgl=cobj.fdtgl;
70a9314b 88 fnoclust=cobj.fnoclust;
aecdf013 89
90 fC00=cobj.fC00; fC10=cobj.fC10; fC11=cobj.fC11; fC20=cobj.fC20; fC21=cobj.fC21;
91 fC22=cobj.fC22; fC30=cobj.fC30; fC31=cobj.fC31; fC32=cobj.fC32; fC33=cobj.fC33;
92 fC40=cobj.fC40; fC41=cobj.fC41; fC42=cobj.fC42; fC43=cobj.fC43; fC44=cobj.fC44;
93
94 *fClusterInTrack = *cobj.fClusterInTrack;
a3894645 95
96 fFieldFactor=cobj.fFieldFactor;
61231d74 97 fMass=cobj.fMass;
98
aecdf013 99 for(i=0; i<cobj.flistCluster->GetSize(); i++)
100 flistCluster->AddLast(cobj.flistCluster->At(i));
101
102}
103
104AliITSTrackV1::AliITSTrackV1(AliTPCtrack &obj)
105{
106//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
107// special constructor to convert a TPC track into an ITS track
108
a3894645 109//////////////////////////////////////// gets magnetic field factor ////////////////////////////////
110
111 AliMagF * fieldPointer = gAlice->Field();
112 fFieldFactor = (Double_t)fieldPointer->Factor();
113 //cout<< " field factor = "<<fFieldFactor<<"\n"; getchar();
114
115/////////////////////////////////////////////////////////////////////////////////////////////////////////
116
117
aecdf013 118 fTPCtrack = &obj;
119 fVertex.ResizeTo(3);
120 fErrorVertex.ResizeTo(3);
121
122 fd2.ResizeTo(6);
123 ftgl2.ResizeTo(6);
124 fdtgl.ResizeTo(6);
125 AliGenerator *gener = gAlice->Generator();
126 Float_t vxg,vyg,vzg;
127 gener->GetOrigin(vxg,vyg,vzg);
128
129
130 fVertex(0)=(Double_t)vxg;
131 fVertex(1)=(Double_t)vyg;
132 fVertex(2)=(Double_t)vzg;
133
134 fLayer = 7;
aecdf013 135 fClusterInTrack = new TMatrix(6,9);
136
b7a35fb7 137 Int_t i,j;
b7a35fb7 138 for(i=0; i<6; i++){
64ab0d55 139 for(j=0; j<9; j++) (*fClusterInTrack)(i,j)=-1.;
b7a35fb7 140 }
aecdf013 141 flistCluster = new TObjArray;
70a9314b 142 fNumClustInTrack = 0;
143 fnoclust=0;
aecdf013 144 LmTPC();
145
146}
147
148
149AliITSTrackV1::~AliITSTrackV1() {
150//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
151//destructor
152
e73fe7f3 153 if(flistCluster) {
154 flistCluster->Delete();
155 delete flistCluster;
156 }
aecdf013 157 if(fClusterInTrack) delete fClusterInTrack;
158
159}
160
161void AliITSTrackV1::PutCElements(Double_t C00, Double_t C10, Double_t C11, Double_t C20, Double_t C21,
162Double_t C22, Double_t C30, Double_t C31, Double_t C32, Double_t C33, Double_t C40,
163Double_t C41, Double_t C42, Double_t C43, Double_t C44){
164//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
165// puts elements of covariance matrix
166
167 fC00=C00; fC10=C10; fC11=C11; fC20=C20; fC21=C21; fC22=C22; fC30=C30; fC31=C31; fC32=C32; fC33=C33;
168 fC40=C40; fC41=C41; fC42=C42; fC43=C43; fC44=C44;
169}
170
171void AliITSTrackV1::GetCElements(Double_t &C00, Double_t &C10, Double_t &C11, Double_t &C20, Double_t &C21,
172Double_t &C22, Double_t &C30, Double_t &C31, Double_t &C32, Double_t &C33, Double_t &C40,
173Double_t &C41, Double_t &C42, Double_t &C43, Double_t &C44) const {
174//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
175// gets elements of covariance matrix
176
177
178 C00=fC00; C10=fC10; C11=fC11; C20=fC20; C21=fC21; C22=fC22; C30=fC30; C31=fC31; C32=fC32; C33=fC33;
179 C40=fC40; C41=fC41; C42=fC42; C43=fC43; C44=fC44;
180
181}
182
183void AliITSTrackV1::GetXElements(Double_t &X0, Double_t &X1, Double_t &X2, Double_t &X3, Double_t &X4) const {
184//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
185// gets the elements of the state vector
186 X0=fX0; X1=fX1; X2=fX2; X3=fX3; X4=fX4;
187}
188
189void AliITSTrackV1::PutXElements(Double_t X0, Double_t X1, Double_t X2, Double_t X3, Double_t X4){
190//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
191// puts the elements of the state vector
192 fX0=X0; fX1=X1; fX2=X2; fX3=X3; fX4=X4;
193}
194
195void AliITSTrackV1::LmTPC() {
196//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
197// Transform the TPC state vector from TPC-local to master and build a new state vector ITS-type
198// The covariance matrix is also modified accordingly
199
200
201 Double_t alpha = fTPCtrack->GetAlpha();
202
203 //printf("LmTPC: alpha %f\n",alpha);
204
205 Double_t yTPC = fTPCtrack->GetY();
206 Double_t zTPC = fTPCtrack->GetZ();
207 Double_t cTPC = fTPCtrack->GetC();
208 Double_t etaTPC = fTPCtrack->GetEta();
209 Double_t tglTPC = fTPCtrack->GetTgl();
210
211
212 Double_t xm, ym, zm;
213 Double_t sina = TMath::Sin(alpha);
214 Double_t cosa = TMath::Cos(alpha);
215 Double_t xl= fTPCtrack->GetX();
216 xm = xl * cosa - yTPC*sina;
217 ym = xl * sina + yTPC*cosa;
218 zm = zTPC;
219 //cout<<" xl e alpha = "<<xl<<" "<<alpha<<"\n"; getchar();
220
221 Double_t x0m,y0m;
222
223 ///////////////////////////////////// determine yo //////////////////////////////////////////////////
224
225 Double_t vxl=fVertex(0)*cosa+fVertex(1)*sina;
226 Double_t vyl= -fVertex(0)*sina+fVertex(1)*cosa;
227 Double_t xo,yo, signy;
228 Double_t r = 1./cTPC;
229 xo = etaTPC / cTPC;
aecdf013 230 Double_t yo1, yo2, diffsq1, diffsq2;
231 yo1 = yTPC + TMath::Sqrt(r*r - (xl-xo)*(xl-xo));
232 yo2 = yTPC - TMath::Sqrt(r*r - (xl-xo)*(xl-xo));
233 diffsq1=TMath::Abs((yo1-vyl)*(yo1-vyl)+(xo-vxl)*(xo-vxl)-r*r);
234 diffsq2=TMath::Abs((yo2-vyl)*(yo2- vyl)+(xo-vxl)*(xo-vxl)-r*r);
235 if(diffsq1<diffsq2) {yo=yo1; signy=1.;} else {yo=yo2; signy=-1.;};
236
237 ////////////////////////////////////////////////////////////////////////////////////////////////////
238
239 x0m = xo * cosa - yo * sina;
240 y0m = xo * sina + yo * cosa;
241
242 frtrack=TMath::Sqrt(xm*xm+ym*ym);
70a9314b 243
61231d74 244 Double_t phi=TMath::ATan2(ym,xm); if(phi<0) phi=2.*TMath::Pi()+phi;
aecdf013 245
246 fX0=phi;
247 fX1=zm;
248 fX3=tglTPC;
249 fX4=cTPC;
250
251
252 Double_t dd=TMath::Sqrt((x0m-fVertex(0))*(x0m-fVertex(0))+(y0m-fVertex(1))*(y0m-fVertex(1)));
253 Double_t signdd;
254 if (r>0) signdd=1.; else signdd=-1.;
255 fX2=signdd*dd-r;
256 //cout<<" fvertex = "<<fVertex(0)<<" "<<fVertex(1)<<" "<<fVertex(2)<<"\n";
257
258 Double_t cov[15];
259 fTPCtrack->GetCovariance(cov);
260
261 Double_t dfidy, dDdy, dDdC, dDdeta;
262
263 dfidy=(xm*cosa+ym*sina)/(frtrack*frtrack);
264 dDdy=signdd*((y0m-fVertex(1))*cosa-(x0m-fVertex(0))*sina)/dd;
265 Double_t dyodr=signy*(r+(xl-xo)*etaTPC)/TMath::Sqrt(r*r-(xl-xo)*(xl-xo));
266 Double_t dyomdr=sina*etaTPC+cosa*dyodr;
267 Double_t dxomdr=cosa*etaTPC-sina*dyodr;
268 Double_t ddddR=((x0m-fVertex(0))*dxomdr+(y0m-fVertex(1))*dyomdr)/dd;
269 dDdC=-r*r*(signdd*ddddR-1.);
270 Double_t dyoldxol=signy*(xl-xo)/TMath::Sqrt(r*r-(xl-xo)*(xl-xo));
271 Double_t dxomdeta=r*(cosa-sina*dyoldxol);
272 Double_t dyomdeta=r*(sina+cosa*dyoldxol);
273 dDdeta=signdd*((x0m-fVertex(0))*dxomdeta+(y0m-fVertex(1))*dyomdeta)/dd;
274
275 Double_t f00=dfidy;
276 Double_t f20=dDdy;
277 Double_t f22=dDdC;
278 Double_t f23=dDdeta;
279
280 Double_t t00=cov[0]*f00;
281 Double_t t02=cov[0]*f20+cov[6]*f22+cov[3]*f23;
282 Double_t t20=cov[6]*f00;
283 Double_t t22=cov[6]*f20+cov[9]*f22+cov[8]*f23;
284
285 fC00=f00*t00;
286 fC10=cov[1]*f00;
287 fC11=cov[2];
288 fC20=f20*t00+f22*t20+f23*cov[3]*f00;
289 fC21=f20*cov[1]+f22*cov[7]+f23*cov[4];
290 fC22=f20*t02+f22*t22+f23*(cov[3]*f20+cov[8]*f22+cov[5]*f23);
291 fC30=cov[10]*f00;
292 fC31=cov[11];
293 fC32=cov[10]*f20+cov[13]*f22+cov[12]*f23;
294 fC33=cov[14];
295 fC40=t20;
296 fC41=cov[7];
297 fC42=t22;
298 fC43=cov[13];
299 fC44=cov[9];
300
aecdf013 301
302}
303
304
305AliITSTrackV1 &AliITSTrackV1::operator=(AliITSTrackV1 obj) {
306//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
307// assignement operator
308
e73fe7f3 309 if (flistCluster) {
310 flistCluster->Delete();
311 delete flistCluster;
312 }
aecdf013 313 delete fClusterInTrack;
314 fClusterInTrack = new TMatrix(6,9);
315 flistCluster = new TObjArray;
316 flabel = obj.flabel;
317 fTPCtrack = obj.fTPCtrack;
318 fNumClustInTrack = obj.fNumClustInTrack;
319 fChi2= obj.fChi2;
320 fVertex=obj.fVertex;
321 fErrorVertex=obj.fErrorVertex;
322 fX0=obj.fX0; fX1=obj.fX1; fX2=obj.fX2; fX3=obj.fX3; fX4=obj.fX4;
323 fLayer=obj.fLayer;
324 frtrack=obj.frtrack;
325 fDv=obj.fDv;
326 fZv=obj.fZv;
327 fsigmaDv=obj.fsigmaDv;
328 fsigmaZv=obj.fsigmaZv;
329 fd2=obj.fd2;
330 ftgl2=obj.ftgl2;
70a9314b 331 fdtgl=obj.fdtgl;
332 fnoclust=obj.fnoclust;
aecdf013 333
334 fC00=obj.fC00; fC10=obj.fC10; fC11=obj.fC11; fC20=obj.fC20; fC21=obj.fC21;
335 fC22=obj.fC22; fC30=obj.fC30; fC31=obj.fC31; fC32=obj.fC32; fC33=obj.fC33;
61231d74 336 fC40=obj.fC40; fC41=obj.fC41; fC42=obj.fC42; fC43=obj.fC43; fC44=obj.fC44;
337
338 fMass=obj.fMass;
aecdf013 339
340 *fClusterInTrack = *obj.fClusterInTrack;
341 Int_t i;
342 for(i=0; i<obj.flistCluster->GetSize(); i++) flistCluster->AddLast(obj.flistCluster->At(i));
343
344 return *this;
345
346}
347
348void AliITSTrackV1::PutCluster(Int_t layerc, TVector vecclust) {
349//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
350// put information for clusters
351
352 (*fClusterInTrack)(layerc,0) = vecclust(0);
353 (*fClusterInTrack)(layerc,1) = vecclust(1);
354 (*fClusterInTrack)(layerc,2) = vecclust(2);
355 (*fClusterInTrack)(layerc,3) = vecclust(3);
356 (*fClusterInTrack)(layerc,4) = vecclust(4);
357 (*fClusterInTrack)(layerc,5) = vecclust(5);
358 (*fClusterInTrack)(layerc,6) = vecclust(6);
359 (*fClusterInTrack)(layerc,7) = vecclust(7);
360 (*fClusterInTrack)(layerc,8) = vecclust(8);
361
362}
363
364
365void AliITSTrackV1::GetClusters() {
366//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
367// prints the clusters belonging to the current track
368
369 TMatrix a(*fClusterInTrack);
370 TMatrix b(6,3);
371 Int_t i;
372 for(i=0;i<6; i++){
373 b(i,0)=a(i,6); b(i,1)=a(i,7); b(i,2)=a(i,8);
374 }
375 a.Print();
376 // b.Print();
377
378}
379
380
381TVector AliITSTrackV1::GetLabTrack(Int_t lay) {
382//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
383// gets the label of the track
384
385 TVector vecLabel(3);
386 vecLabel(0)=( (Float_t) (*fClusterInTrack)(lay,6) );
387 vecLabel(1)=( (Float_t) (*fClusterInTrack)(lay,7) );
388 vecLabel(2)=( (Float_t) (*fClusterInTrack)(lay,8) );
389 return vecLabel;
390}
391
392void AliITSTrackV1::Search(TVector VecTotLabref, Long_t &labref, Int_t &freq){
393//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
394// define label
395
396 Int_t vecfreq[18];
397
398 Int_t i,j;
399 for(i=0; i<18; i++) vecfreq[i]=0;
400
401 for(i=0; i<18; i++) {
402 for(j=0; j<18; j++) {
403 // if(VecTotLabref(i) == 0.) VecTotLabref(i)=-3.; //commentato il 5-3-2001
404 if( (VecTotLabref(i)>=0.) && (VecTotLabref(i)==VecTotLabref(j)) ) vecfreq[i]++;
405 }
406 }
407 Int_t imax=-1000;
408 Long_t labdefault= (Long_t)1000000.;
409 freq=0;
410 for(i=0; i<18; i++) {
411 if(vecfreq[i]>freq) {freq=vecfreq[i]; imax=i;}
412 }
413 if(imax<0) labref=labdefault; else labref=(Long_t) VecTotLabref(imax);
414}
415
416
417void AliITSTrackV1::Propagation(Double_t rk) {
418//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
419//Propagation of track
420 Double_t duepi=2.*TMath::Pi();
421 Double_t rkm1=frtrack;
422//cout<<" rk e rkm1 dentro Propagation "<<rk<<" "<<rkm1<<"\n";
423
424 //
425 Double_t aAk=ArgA(rk), aAkm1=ArgA(rkm1);
426 Double_t ak=Arga(rk), akm1=Arga(rkm1);
427 fX0+=TMath::ASin(aAk)-TMath::ASin(aAkm1);
428
429 if(fX0>duepi) fX0-=duepi;
430 if(fX0<0.) fX0+=duepi;
431
432 Double_t tgl=fX3;
433 Double_t c=fX4;
434 Double_t d=fX2;
435 Double_t cy=c/2;
436 fX1+=tgl/cy*(TMath::ASin(ak)-TMath::ASin(akm1));
437 frtrack=rk;
438
439
440 Double_t bk=ArgB(rk), bkm1=ArgB(rkm1);
441 Double_t ck=ArgC(rk), ckm1=ArgC(rkm1);
442
443 Double_t f02=ck/TMath::Sqrt(1.-aAk*aAk) - ckm1/TMath::Sqrt(1.-aAkm1*aAkm1);
444 Double_t f04=bk/TMath::Sqrt(1.-aAk*aAk) - bkm1/TMath::Sqrt(1.-aAkm1*aAkm1);
445 Double_t f12=tgl*d*(1./rk - 1./rkm1);
446 Double_t f13=rk - rkm1;
447
448
449 Double_t c00=fC00;
450 Double_t c10=fC10;
451 Double_t c11=fC11;
452 Double_t c20=fC20;
453 Double_t c21=fC21;
454 Double_t c22=fC22;
455 Double_t c30=fC30;
456 Double_t c31=fC31;
457 Double_t c32=fC32;
458 Double_t c33=fC33;
459 Double_t c40=fC40;
460 Double_t c41=fC41;
461 Double_t c42=fC42;
462 Double_t c43=fC43;
463 Double_t c44=fC44;
464
465 Double_t r10=c10+c21*f02+c41*f04;
466 Double_t r20=c20+c22*f02+c42*f04;
467 Double_t r30=c30+c32*f02+c43*f04;
468 Double_t r40=c40+c42*f02+c44*f04;
469 Double_t r21=c21+c22*f12+c32*f13;
470 Double_t r31=c31+c32*f12+c33*f13;
471 Double_t r41=c41+c42*f12+c43*f13;
472
473 fC00=c00+c20*f02+c40*f04+f02*r20+f04*r40;
474 fC10=r10+f12*r20+f13*r30;
475 fC11=c11+c21*f12+c31*f13+f12*r21+f13*r31;
476 fC20=r20;
477 fC21=r21;
478 fC30=r30;
479 fC31=r31;
480 fC40=r40;
481 fC41=r41;
482
483}
484
485void AliITSTrackV1::AddEL(AliITSRad *rl, Double_t signdE, Bool_t flagtot, Double_t mass) {
486//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
487// add energy loss
488
61231d74 489 mass=fMass;
490
aecdf013 491 TVector s(6);
492 s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
493 //s(0)=0.0026+0.00283*2.; s(1)=0.018*2.; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
494 //0.00277 is added in the first layer to take into account the energy loss in the beam pipe
495
496 //for(int k=0; k<6; k++) cout<<s(k)<<" "; cout<<"\n";
497 Int_t k;
70a9314b 498 //for(k=0; k<6; k++) s(k)=s(k)*1.6; //forint
499 for(k=0; k<6; k++) s(k)=s(k)*1.7; //forint
aecdf013 500
501 Double_t phi=fX0;
502
503 if(phi<0.174 ) s(5)=s(5)+0.012;
a3894645 504 if(phi>6.1 ) s(5)=s(5)+0.012; // to take into account rail
505 if(phi>2.96 && phi<3.31 ) s(5)=s(5)+0.012;
aecdf013 506
70a9314b 507 /*
aecdf013 508 Double_t tgl=fX3;
509 Double_t theta=((TMath::Pi())/2.)-TMath::ATan(tgl);
510 //phi*=180./TMath::Pi();
511 //theta*=180./TMath::Pi();
512 //Double_t rad90=(TMath::Pi())/2.;
513 Double_t rad40=(TMath::Pi())*40./180.;
514 Double_t rad100=(TMath::Pi())*100/180;
515 Double_t rad360=(TMath::Pi())*2.;
516 Int_t imax=rl->Getimax();
517 Int_t jmax=rl->Getjmax();
518 Int_t i=(Int_t) ( (theta-rad40)/rad100*imax);
519 Int_t j=(Int_t) ( phi/rad360*jmax );
520 //Int_t i=(Int_t)( ((theta-((TMath::Pi())/4.))/((TMath::Pi())/2.))*imax );
521 //Int_t j=(Int_t)( (phi/((TMath::Pi())*2.))*jmax );
522 if(i<0) i=0;
523 if(i>=imax) i=imax-1;
524 if(j<0) j=0;
525 if(j>=jmax) j=jmax-1;
70a9314b 526
aecdf013 527 s(0) = 0.0028/TMath::Sin(theta)+( rl->GetRadMatrix1() )(i,j); // 0.0028 takes into account the beam pipe
528 s(1) = ( rl->GetRadMatrix2() )(i,j);
529 s(2) = ( rl->GetRadMatrix3() )(i,j);
530 s(3) = ( rl->GetRadMatrix4() )(i,j);
531 s(4) = ( rl->GetRadMatrix5() )(i,j);
532 s(5) = ( rl->GetRadMatrix6() )(i,j);
533
534
535 */
536
537 //for(int k=0; k<6; k++) cout<<s(k)<<" "; getchar();
538
539 //if(phi>60) {cout<<" phi = "<<phi<<"\n"; getchar();}
540 //if(theta<45 || theta>135) {cout<<" theta = "<<theta<<"\n"; getchar();}
541 //cout<<" dentro AddEl: phi, theta = "<<phi<<" "<<theta<<"\n"; getchar();
542
70a9314b 543 Double_t cl=1.+fX3*fX3; // cl=1/(cosl)**2 = 1 + (tgl)**2
aecdf013 544 Double_t sqcl=TMath::Sqrt(cl);
545 Double_t pt=GetPt();
546
547 Double_t p2=pt*pt*cl;
548 Double_t e=TMath::Sqrt(p2+mass*mass);
549 Double_t beta2=p2/(p2+mass*mass);
550
551 Double_t dE;
552 if(flagtot) {
553 Double_t stot=s(0)+s(1)+s(2)+s(3)+s(4)+s(5);
554 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*stot*21.82*sqcl;
555 } else {
556 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*s(fLayer-1)*21.82*sqcl;
557 }
558 dE=signdE*dE/1000.;
559
560 e+=dE;
561 Double_t p=TMath::Sqrt(e*e-mass*mass);
562 Double_t sign=1.;
563 if(fX4 < 0.) sign=-1.;
564 pt=sign*p/sqcl;
a3894645 565 Double_t cc=(0.299792458*0.2*fFieldFactor)/(pt*100.);
aecdf013 566 fX4=cc;
567
568}
569
570void AliITSTrackV1::Correct(Double_t rk) {
571//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
572// correct track to take into account real geometry detector
573
574 Double_t duepi=2.*TMath::Pi();
575 Double_t rkm1=frtrack;
576 Double_t aAk=ArgA(rk), aAkm1=ArgA(rkm1);
577 Double_t ak=Arga(rk), akm1=Arga(rkm1);
578
579 fX0+=TMath::ASin(aAk)-TMath::ASin(aAkm1);
580 if(fX0>duepi) fX0-=duepi;
581 if(fX0<0.) fX0+=duepi;
582
583 Double_t tgl=fX3;
584 Double_t c=fX4;
585 Double_t cy=c/2;
586 fX1+=tgl/cy*(TMath::ASin(ak)-TMath::ASin(akm1));
587 frtrack=rk;
588
589}
590
70a9314b 591void AliITSTrackV1::AddMS(AliITSRad *rl, Double_t mass) {
aecdf013 592//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
593////////// Modification of the covariance matrix to take into account multiple scattering ///////////
594
61231d74 595 mass=fMass;
596
aecdf013 597 TVector s(6);
598
599 s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
600 // s(0)=0.0026+0.00283*2.; s(1)=0.018*2.; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
601//0.00277 is added in the first layer to take into account the energy loss in the beam pipe
602
603 Int_t k;
70a9314b 604 //for(k=0; k<6; k++) s(k)=s(k)*1.6; // forint
605 for(k=0; k<6; k++) s(k)=s(k)*1.7; // forint
aecdf013 606
607 Double_t phi=fX0;
608 if(phi<0.174 ) s(5)=s(5)+0.012; //aggiunta provvisoria
609 if(phi>6.1 ) s(5)=s(5)+0.012; //aggiunta provvisoria
610 if(phi>2.96 && phi< 3.31) s(5)=s(5)+0.012; //aggiunta provvisoria
70a9314b 611
aecdf013 612
613 Double_t tgl=fX3;
70a9314b 614 /*
aecdf013 615 Double_t theta=((TMath::Pi())/2.)-TMath::ATan(tgl);
616 Double_t rad40=(TMath::Pi())*40./180.; // rivedere
617 Double_t rad100=(TMath::Pi())*100/180;
618 Double_t rad360=(TMath::Pi())*2.;
619 Int_t imax=rl->Getimax();
620 Int_t jmax=rl->Getjmax();
621 Int_t i=(Int_t) ( (theta-rad40)/rad100*imax);
622 Int_t j=(Int_t) ( phi/rad360*jmax);
623
624 if(i<0) i=0;
625 if(i>=imax) i=imax-1;
626 if(j<0) j=0;
627 if(j>=jmax) j=jmax-1;
70a9314b 628
aecdf013 629 s(0) = 0.0028/TMath::Sin(theta)+( rl->GetRadMatrix1() )(i,j); // 0.0028 takes into account the beam pipe
630 s(1) = ( rl->GetRadMatrix2() )(i,j);
631 s(2) = ( rl->GetRadMatrix3() )(i,j);
632 s(3) = ( rl->GetRadMatrix4() )(i,j);
633 s(4) = ( rl->GetRadMatrix5() )(i,j);
634 s(5) = ( rl->GetRadMatrix6() )(i,j);
635 */
70a9314b 636 //Double_t mass=0.1396;
aecdf013 637 Int_t layer=(Int_t)GetLayer();
638
639 Double_t cosl=TMath::Cos(TMath::ATan(tgl));
640 Double_t d=fX2;
641 Double_t c=fX4;
642 Double_t cy=c/2.;
643 Double_t q20=1./(cosl*cosl);
644 Double_t q30=c*tgl;
645
646 Double_t q40=cy*(frtrack*frtrack-d*d)/(1.+ 2.*cy*d);
647 Double_t dd=d+cy*d*d-cy*frtrack*frtrack;
648 Double_t dprova=frtrack*frtrack - dd*dd;
649 Double_t q41=0.;
650 if(dprova>0.) q41=-1./cosl*TMath::Sqrt(dprova)/(1.+ 2.*cy*d);
651
652 Double_t p2=(GetPt()*GetPt())/(cosl*cosl);
653 Double_t beta2=p2/(p2+mass*mass);
61231d74 654 // Double_t theta2=14.1*14.1/(beta2*p2*1.e6)*(s(layer-1)/cosl);
655 Double_t theta2=14.1*14.1/(beta2*p2*1.e6)*(s(layer-1)/TMath::Abs(cosl));
aecdf013 656
657 fC22+=theta2*(q40*q40+q41*q41);
658 fC32+=theta2*q20*q40;
659 fC33+=theta2*q20*q20;
660 fC42+=theta2*q30*q40;
661 fC43+=theta2*q30*q20;
662 fC44+=theta2*q30*q30;
663
664}
665void AliITSTrackV1::PrimaryTrack(AliITSRad *rl) {
666//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
667// calculation of part of covariance matrix for vertex constraint
668
669 Double_t rlayer[6];
670
671 rlayer[0]=4.; rlayer[1]=7.; rlayer[2]=14.9; rlayer[3]=23.8;
672 rlayer[4]=39.1; rlayer[5]=43.6;
673
674 Double_t cy=fX4/2.;
675 Double_t tgl=(fX1-fZv)*cy/TMath::ASin(cy*frtrack);
676 Double_t frtrack=1.;
677 fX0=0.;
678 fX1=frtrack*tgl;
679 fX2=fDv;
680 fX3=tgl;
681
682 fC00=fC10=fC11=fC20=fC21=fC22=fC30=fC31=fC32=fC33=fC40=fC41=fC42=fC43=0.;
683
684 AddEL(rl,1.,1);
685 fLayer=0;
686 Int_t i;
687 for (i=0; i<6; i++) {
688 Propagation(rlayer[i]);
689 fLayer++;
690 fd2(i)=fC22;
691 ftgl2(i)=fC33;
692 fdtgl(i)=fC32;
693 AddMS(rl);
694 AddEL(rl,-1,0);
695 }
696}
697
698
699Int_t AliITSTrackV1::DoNotCross(Double_t rk) const{
700//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
701// determine if the track cross a layer
702
703 Double_t c=fX4;
704 Double_t d=fX2;
705 Double_t cy=c/2.;
706 return (TMath::Abs((cy*rk+(1.+cy*d)*d/rk)/(1.+2.*cy*d))>=1.)?1:0;
707}
708
709
710Double_t AliITSTrackV1::ArgA(Double_t rk) const {
711//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
712// quantity usefull in Propagation
713 Double_t c=fX4;
714 Double_t d=fX2;
715 Double_t cy=c/2.;
716 Double_t arg=(cy*rk + (1 + cy*d)*d/rk)/(1.+ 2.*cy*d);
717 if (TMath::Abs(arg) < 1.) return arg;
718 //cout<<"class AliITSTrack: ArgA out of range !\n";/* getchar();*/
719 return (arg>0) ? 0.99999999999 : -0.9999999999;
720}
721
722Double_t AliITSTrackV1::Arga(Double_t rk) const {
723//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
724// quantity usefull in Propagation
725 Double_t c=fX4;
726 Double_t d=fX2;
727 Double_t cy=c/2.;
728 Double_t arg=(rk*rk - d*d)/(1.+ 2.*cy*d);
729 if (arg<0.) {/*cout<<"class AliITSTrack: Arga out of range !\n";*/ arg=0.;}
730 return cy*TMath::Sqrt(arg);
731}
732
733Double_t AliITSTrackV1::ArgB(Double_t rk) const {
734//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
735// quantity usefull in Propagation
736 Double_t c=fX4;
737 Double_t d=fX2;
738 Double_t cy=c/2.;
739 return (rk*rk - d*d)/(rk*(1.+ 2.*cy*d)*(1.+ 2.*cy*d));
740}
741
742Double_t AliITSTrackV1::ArgC(Double_t rk) const {
743//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
744// quantity usefull in Propagation
745 Double_t c=fX4;
746 Double_t d=fX2;
747 Double_t cy=c/2.;
748 return (1./rk - 2.*cy*ArgA(rk)/(1.+ 2.*cy*d));
749}
750
751
70a9314b 752Double_t AliITSTrackV1::GetPredChi2(Double_t m[2], Double_t sigma[2] ) const {
753//Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
754// This function calculates a predicted chi2 increment.
64ab0d55 755
70a9314b 756 Double_t r00=sigma[0], r01=0., r11=sigma[1];
757 r00+=fC00; r01+=fC10; r11+=fC11;
758 Double_t det=r00*r11-r01*r01;
759 if(TMath::Abs(det) < 1.e-15) {cout<<" Problems on matrix in GetPredChi2 "<<det<<"\n";
760 return 1e10;}
761 Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
762 Double_t dphi=m[0]-fX0;
763 Double_t dz=m[1]-fX1;
764 Double_t chi2 = (dphi*r00*dphi +2.*r01*dphi*dz + dz*r11*dz)/det;
765 return chi2;
766
70a9314b 767}