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added new enum that describes the type of analysis, passed to all analysis classes
[u/mrichter/AliRoot.git] / ITS / AliITSClusterParam.cxx
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572f41f9 1/**************************************************************************
2 * Copyright(c) 1998-2007, 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/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// ITS cluster error and shape parameterization //
21// //
22// andrea.dainese@lnl.infn.it //
23///////////////////////////////////////////////////////////////////////////////
24//#include "TFile.h"
25//#include "TTree.h"
26//#include <TVectorF.h>
27//#include <TLinearFitter.h>
28//#include <TH1F.h>
29//#include <TProfile2D.h>
e50912db 30#include <TVector3.h>
572f41f9 31#include "TMath.h"
e50912db 32#include "AliGeomManager.h"
572f41f9 33#include "AliITSRecPoint.h"
34#include "AliITSClusterParam.h"
e50912db 35#include "AliITSReconstructor.h"
36#include "AliExternalTrackParam.h"
572f41f9 37
38ClassImp(AliITSClusterParam)
39
40
41AliITSClusterParam* AliITSClusterParam::fgInstance = 0;
42
43
44/*
45 Example usage fitting parameterization (NOT YET...):
46 TFile fres("resol.root"); //tree with resolution and shape
47 TTree * treeRes =(TTree*)fres.Get("Resol");
48
49 AliITSClusterParam param;
50 param.SetInstance(&param);
51 param.FitResol(treeRes);
52 param.FitRMS(treeRes);
53 TFile fparam("ITSClusterParam.root","recreate");
54 param.Write("Param");
55 //
56 //
57 TFile fparam("ITSClusterParam.root");
58 AliITSClusterParam *param2 = (AliITSClusterParam *) fparam.Get("Param");
59 param2->SetInstance(param2);
60 param2->Test(treeRes);
61
62
63 treeRes->Draw("(Resol-AliITSClusterParam::SGetError0(Dim,Pad,Zm,AngleM))/Resol","Dim==0&&QMean<0")
64*/
65
66//-------------------------------------------------------------------------
67AliITSClusterParam* AliITSClusterParam::Instance()
68{
69 //
70 // Singleton implementation
71 // Returns an instance of this class, it is created if neccessary
72 //
73 if (fgInstance == 0){
74 fgInstance = new AliITSClusterParam();
75 }
76 return fgInstance;
77}
78//-------------------------------------------------------------------------
79void AliITSClusterParam::GetNTeor(Int_t layer,const AliITSRecPoint* /*cl*/,
e50912db 80 Float_t tgl,Float_t tgphitr,
572f41f9 81 Float_t &ny,Float_t &nz)
82{
83 //
e50912db 84 // Get "mean shape" (original parametrization from AliITStrackerMI)
572f41f9 85 //
e50912db 86 tgl = TMath::Abs(tgl);
87 tgphitr = TMath::Abs(tgphitr);
88
89 // SPD
90 if (layer==0) {
91 ny = 1.+tgphitr*3.2;
92 nz = 1.+tgl*0.34;
572f41f9 93 return;
94 }
e50912db 95 if (layer==1) {
96 ny = 1.+tgphitr*3.2;
97 nz = 1.+tgl*0.28;
572f41f9 98 return;
99 }
e50912db 100 // SSD
101 if (layer==4 || layer==5) {
102 ny = 2.02+tgphitr*1.95;
103 nz = 2.02+tgphitr*2.35;
572f41f9 104 return;
105 }
e50912db 106 // SDD
107 ny = 6.6-2.7*tgphitr;
108 nz = 2.8-3.11*tgphitr+0.45*tgl;
109 return;
110}
111//--------------------------------------------------------------------------
112Int_t AliITSClusterParam::GetError(Int_t layer,
113 const AliITSRecPoint *cl,
114 Float_t tgl,Float_t tgphitr,Float_t expQ,
115 Float_t &erry,Float_t &errz)
116{
117 //
118 // Calculate cluster position error
119 //
120 switch(AliITSReconstructor::GetRecoParam()->GetClusterErrorsParam()) {
121 case 0:
122 return GetErrorOrigRecPoint(cl,erry,errz);
123 break;
124 case 1:
125 return GetErrorParamMI(layer,cl,tgl,tgphitr,expQ,erry,errz);
126 break;
127 case 2:
128 return GetErrorParamAngle(layer,cl,tgl,tgphitr,erry,errz);
129 break;
130 default:
131 return GetErrorParamMI(layer,cl,tgl,tgphitr,expQ,erry,errz);
132 break;
133 }
134
572f41f9 135}
136//--------------------------------------------------------------------------
e50912db 137Int_t AliITSClusterParam::GetErrorOrigRecPoint(const AliITSRecPoint*cl,
572f41f9 138 Float_t &erry,Float_t &errz)
139{
e50912db 140 //
141 // Calculate cluster position error (just take error from AliITSRecPoint)
142 //
143 erry = TMath::Sqrt(cl->GetSigmaY2());
144 errz = TMath::Sqrt(cl->GetSigmaZ2());
145
146 return 1;
147}
148//--------------------------------------------------------------------------
149Int_t AliITSClusterParam::GetErrorParamMI(Int_t layer,const AliITSRecPoint*cl,
150 Float_t tgl,Float_t tgphitr,
151 Float_t expQ,
152 Float_t &erry,Float_t &errz)
153{
154 //
155 // Calculate cluster position error (original parametrization from
156 // AliITStrackerMI)
572f41f9 157 //
158 Float_t nz,ny;
e50912db 159 GetNTeor(layer, cl,tgl,tgphitr,ny,nz);
572f41f9 160 erry = TMath::Sqrt(cl->GetSigmaY2());
161 errz = TMath::Sqrt(cl->GetSigmaZ2());
162 //
163 // PIXELS
164 if (layer<2){
165 if (TMath::Abs(ny-cl->GetNy())>0.6) {
166 if (ny<cl->GetNy()){
167 erry*=0.4+TMath::Abs(ny-cl->GetNy());
168 errz*=0.4+TMath::Abs(ny-cl->GetNy());
169 }else{
170 erry*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
171 errz*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
172 }
173 }
174 if (TMath::Abs(nz-cl->GetNz())>1.) {
175 erry*=TMath::Abs(nz-cl->GetNz());
176 errz*=TMath::Abs(nz-cl->GetNz());
177 }
178 erry*=0.85;
179 errz*=0.85;
180 erry= TMath::Min(erry,float(0.0050));
181 errz= TMath::Min(errz,float(0.0300));
182 return 10;
183 }
184
185 //STRIPS
186 if (layer>3){
187 //factor 1.8 appears in new simulation
188 //
189 Float_t scale=1.8;
190 if (cl->GetNy()==100||cl->GetNz()==100){
191 erry = 0.004*scale;
192 errz = 0.2*scale;
193 return 100;
194 }
195 if (cl->GetNy()+cl->GetNz()>12){
196 erry = 0.06*scale;
197 errz = 0.57*scale;
198 return 100;
199 }
e50912db 200 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+tgl*tgl+tgphitr*tgphitr));
572f41f9 201 Float_t chargematch = TMath::Max(double(normq/expQ),2.);
202 //
203 if (cl->GetType()==1 || cl->GetType()==10 ){
204 if (chargematch<1.0 || (cl->GetNy()+cl->GetNz()<nz+ny+0.5)){
205 errz = 0.043*scale;
206 erry = 0.00094*scale;
207 return 101;
208 }
209 if (cl->GetNy()+cl->GetNz()<nz+ny+1.2){
210 errz = 0.06*scale;
211 erry =0.0013*scale;
212 return 102;
213 }
214 erry = 0.0027*scale;
215 errz = TMath::Min(0.028*(chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.15)*scale;
216 return 103;
217 }
218 if (cl->GetType()==2 || cl->GetType()==11 ){
219 erry = TMath::Min(0.0010*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.05)*scale;
220 errz = TMath::Min(0.025*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.5)*scale;
221 return 104;
222 }
223
224 if (cl->GetType()>100 ){
225 if ((chargematch+cl->GetNy()+cl->GetNz()-nz-ny<1.5)){
226 errz = 0.05*scale;
227 erry = 0.00096*scale;
228 return 105;
229 }
230 if (cl->GetNy()+cl->GetNz()-nz-ny<1){
231 errz = 0.10*scale;
232 erry = 0.0025*scale;
233 return 106;
234 }
235
236 errz = TMath::Min(0.05*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.4)*scale;
237 erry = TMath::Min(0.003*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.05)*scale;
238 return 107;
239 }
240 Float_t diff = cl->GetNy()+cl->GetNz()-ny-nz;
241 if (diff<1) diff=1;
242 if (diff>4) diff=4;
243
244 if (cl->GetType()==5||cl->GetType()==6||cl->GetType()==7||cl->GetType()==8){
245 errz = 0.14*diff;
246 erry = 0.003*diff;
247 return 108;
248 }
249 erry = 0.04*diff;
250 errz = 0.06*diff;
251 return 109;
252 }
253 //DRIFTS
e50912db 254 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+tgl*tgl+tgphitr*tgphitr));
572f41f9 255 Float_t chargematch = normq/expQ;
256 chargematch/=2.4; // F. Prino Sept. 2007: SDD charge conversion keV->ADC
257 Float_t factorz=1;
258 Int_t cnz = cl->GetNz()%10;
259 //charge match
260 if (cl->GetType()==1){
261 if (chargematch<1.25){
262 erry = 0.0028*(1.+6./cl->GetQ()); // gold clusters
263 }
264 else{
265 erry = 0.003*chargematch;
266 if (cl->GetNz()==3) erry*=1.5;
267 }
268 if (chargematch<1.0){
269 errz = 0.0011*(1.+6./cl->GetQ());
270 }
271 else{
272 errz = 0.002*(1+2*(chargematch-1.));
273 }
274 if (cnz>nz+0.6) {
275 erry*=(cnz-nz+0.5);
276 errz*=1.4*(cnz-nz+0.5);
277 }
278 }
279 if (cl->GetType()>1){
280 if (chargematch<1){
281 erry = 0.00385*(1.+6./cl->GetQ()); // gold clusters
282 errz = 0.0016*(1.+6./cl->GetQ());
283 }
284 else{
285 errz = 0.0014*(1+3*(chargematch-1.));
286 erry = 0.003*(1+3*(chargematch-1.));
287 }
288 if (cnz>nz+0.6) {
289 erry*=(cnz-nz+0.5);
290 errz*=1.4*(cnz-nz+0.5);
291 }
292 }
293
294 if (TMath::Abs(cl->GetY())>2.5){
295 factorz*=1+2*(TMath::Abs(cl->GetY())-2.5);
296 }
297 if (TMath::Abs(cl->GetY())<1){
298 factorz*=1.+0.5*TMath::Abs(TMath::Abs(cl->GetY())-1.);
299 }
300 factorz= TMath::Min(factorz,float(4.));
301 errz*=factorz;
302
303 erry= TMath::Min(erry,float(0.05));
304 errz= TMath::Min(errz,float(0.05));
305 return 200;
306}
307//--------------------------------------------------------------------------
e50912db 308Int_t AliITSClusterParam::GetErrorParamAngle(Int_t layer,
309 const AliITSRecPoint *cl,
310 Float_t tgl,Float_t tgphitr,
311 Float_t &erry,Float_t &errz)
312{
313 //
314 // Calculate cluster position error (parametrization extracted from rp-hit
315 // residuals, as a function of angle between track and det module plane.
316 // Origin: M.Lunardon, S.Moretto)
317 //
318
319 Double_t maxSigmaSPDx=100.;
320 Double_t maxSigmaSPDz=400.;
321 Double_t maxSigmaSDDx=100.;
322 Double_t maxSigmaSDDz=400.;
323 Double_t maxSigmaSSDx=100.;
324 Double_t maxSigmaSSDz=1000.;
325
326 Double_t paramSPDx[3]={-6.417,0.18,11.14};
327 Double_t paramSPDz[2]={118.,-0.155};
328 Double_t paramSDDx[2]={30.93,0.059};
329 Double_t paramSDDz[2]={33.09,0.011};
330 Double_t paramSSDx[2]={18.64,-0.0046};
331 Double_t paramSSDz[2]={784.4,-0.828};
332 Double_t sigmax=1000.0,sigmaz=1000.0;
333
334 Int_t volId = (Int_t)cl->GetVolumeId();
335 Double_t tra[3]; AliGeomManager::GetOrigTranslation(volId,tra);
336 Double_t rot[9]; AliGeomManager::GetOrigRotation(volId,rot);
337
338
339 Double_t phitr = TMath::ATan(tgphitr);
340 Double_t alpha = TMath::ATan2(tra[1],tra[0]);
341 Double_t phiglob = alpha+phitr;
342 Double_t p[3];
343 p[0] = TMath::Cos(phiglob);
344 p[1] = TMath::Sin(phiglob);
345 p[2] = tgl;
346 TVector3 pvec(p[0],p[1],p[2]);
347 TVector3 normvec(rot[1],-rot[0],0.);
348 Double_t angle = pvec.Angle(normvec);
349 if(angle>0.5*TMath::Pi()) angle = TMath::Pi()-angle;
0ffe9832 350 Double_t angleDeg = angle*180./TMath::Pi();
e50912db 351
352 if(layer==0 || layer==1) { // SPD
353
354 sigmax = TMath::Exp(angleDeg*paramSPDx[1]+paramSPDx[0])+paramSPDx[2];
355 sigmaz = paramSPDz[0]+paramSPDz[1]*angleDeg;
356 if(sigmax > maxSigmaSPDx) sigmax = maxSigmaSPDx;
357 if(sigmaz > maxSigmaSPDz) sigmax = maxSigmaSPDz;
358
359 } else if(layer==2 || layer==3) { // SDD
360
361 sigmax = angleDeg*paramSDDx[1]+paramSDDx[0];
362 sigmaz = paramSDDz[0]+paramSDDz[1]*angleDeg;
363 if(sigmax > maxSigmaSDDx) sigmax = maxSigmaSDDx;
364 if(sigmaz > maxSigmaSDDz) sigmax = maxSigmaSDDz;
365
366 } else if(layer==4 || layer==5) { // SSD
367
368 sigmax = angleDeg*paramSSDx[1]+paramSSDx[0];
369 sigmaz = paramSSDz[0]+paramSSDz[1]*angleDeg;
370 if(sigmax > maxSigmaSSDx) sigmax = maxSigmaSSDx;
371 if(sigmaz > maxSigmaSSDz) sigmax = maxSigmaSSDz;
372
373 }
374
375 // convert from micron to cm
376 erry = 1.e-4*sigmax;
377 errz = 1.e-4*sigmaz;
378
379 return 1;
380}
381//--------------------------------------------------------------------------
572f41f9 382void AliITSClusterParam::Print(Option_t* /*option*/) const {
383 //
384 // Print param Information
385 //
386
387 //
388 // Error parameterization
389 //
390 printf("NOT YET...\n");
391 return;
392}
393
394
395
396
397