1 /**************************************************************************
2 * Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
20 // ITS cluster error and shape parameterization //
22 // andrea.dainese@lnl.infn.it //
23 ///////////////////////////////////////////////////////////////////////////////
26 //#include <TVectorF.h>
27 //#include <TLinearFitter.h>
29 //#include <TProfile2D.h>
32 #include "AliGeomManager.h"
33 #include "AliITSRecPoint.h"
34 #include "AliITSClusterParam.h"
35 #include "AliITSReconstructor.h"
36 #include "AliExternalTrackParam.h"
38 ClassImp(AliITSClusterParam)
41 AliITSClusterParam* AliITSClusterParam::fgInstance = 0;
45 Example usage fitting parameterization (NOT YET...):
46 TFile fres("resol.root"); //tree with resolution and shape
47 TTree * treeRes =(TTree*)fres.Get("Resol");
49 AliITSClusterParam param;
50 param.SetInstance(¶m);
51 param.FitResol(treeRes);
52 param.FitRMS(treeRes);
53 TFile fparam("ITSClusterParam.root","recreate");
57 TFile fparam("ITSClusterParam.root");
58 AliITSClusterParam *param2 = (AliITSClusterParam *) fparam.Get("Param");
59 param2->SetInstance(param2);
60 param2->Test(treeRes);
63 treeRes->Draw("(Resol-AliITSClusterParam::SGetError0(Dim,Pad,Zm,AngleM))/Resol","Dim==0&&QMean<0")
66 //-------------------------------------------------------------------------
67 AliITSClusterParam* AliITSClusterParam::Instance()
70 // Singleton implementation
71 // Returns an instance of this class, it is created if neccessary
74 fgInstance = new AliITSClusterParam();
78 //-------------------------------------------------------------------------
79 void AliITSClusterParam::GetNTeor(Int_t layer,const AliITSRecPoint* /*cl*/,
80 Float_t tgl,Float_t tgphitr,
81 Float_t &ny,Float_t &nz)
84 // Get "mean shape" (original parametrization from AliITStrackerMI)
86 tgl = TMath::Abs(tgl);
87 tgphitr = TMath::Abs(tgphitr);
101 if (layer==4 || layer==5) {
102 ny = 2.02+tgphitr*1.95;
103 nz = 2.02+tgphitr*2.35;
107 ny = 6.6-2.7*tgphitr;
108 nz = 2.8-3.11*tgphitr+0.45*tgl;
111 //--------------------------------------------------------------------------
112 Int_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,
119 // Calculate cluster position error
122 switch(AliITSReconstructor::GetRecoParam()->GetClusterErrorsParam()) {
124 retval = GetErrorOrigRecPoint(cl,erry,errz);
127 retval = GetErrorParamMI(layer,cl,tgl,tgphitr,expQ,erry,errz);
130 retval = GetErrorParamAngle(layer,cl,tgl,tgphitr,erry,errz);
133 retval = GetErrorParamMI(layer,cl,tgl,tgphitr,expQ,erry,errz);
138 // add error due to misalignment (to be improved)
139 Float_t errmisalY2 = AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(layer)
140 *AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(layer);
141 Float_t errmisalZ2 = AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(layer)
142 *AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(layer);
143 erry = TMath::Sqrt(erry*erry+errmisalY2);
144 errz = TMath::Sqrt(errz*errz+errmisalZ2);
150 //--------------------------------------------------------------------------
151 Int_t AliITSClusterParam::GetErrorOrigRecPoint(const AliITSRecPoint*cl,
152 Float_t &erry,Float_t &errz)
155 // Calculate cluster position error (just take error from AliITSRecPoint)
157 erry = TMath::Sqrt(cl->GetSigmaY2());
158 errz = TMath::Sqrt(cl->GetSigmaZ2());
162 //--------------------------------------------------------------------------
163 Int_t AliITSClusterParam::GetErrorParamMI(Int_t layer,const AliITSRecPoint*cl,
164 Float_t tgl,Float_t tgphitr,
166 Float_t &erry,Float_t &errz)
169 // Calculate cluster position error (original parametrization from
173 GetNTeor(layer, cl,tgl,tgphitr,ny,nz);
174 erry = TMath::Sqrt(cl->GetSigmaY2());
175 errz = TMath::Sqrt(cl->GetSigmaZ2());
179 if (TMath::Abs(ny-cl->GetNy())>0.6) {
181 erry*=0.4+TMath::Abs(ny-cl->GetNy());
182 errz*=0.4+TMath::Abs(ny-cl->GetNy());
184 erry*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
185 errz*=0.7+0.5*TMath::Abs(ny-cl->GetNy());
188 if (TMath::Abs(nz-cl->GetNz())>1.) {
189 erry*=TMath::Abs(nz-cl->GetNz());
190 errz*=TMath::Abs(nz-cl->GetNz());
194 erry= TMath::Min(erry,float(0.0050));
195 errz= TMath::Min(errz,float(0.0300));
201 //factor 1.8 appears in new simulation
204 if (cl->GetNy()==100||cl->GetNz()==100){
209 if (cl->GetNy()+cl->GetNz()>12){
214 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+tgl*tgl+tgphitr*tgphitr));
215 Float_t chargematch = TMath::Max(double(normq/expQ),2.);
217 if (cl->GetType()==1 || cl->GetType()==10 ){
218 if (chargematch<1.0 || (cl->GetNy()+cl->GetNz()<nz+ny+0.5)){
220 erry = 0.00094*scale;
223 if (cl->GetNy()+cl->GetNz()<nz+ny+1.2){
229 errz = TMath::Min(0.028*(chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.15)*scale;
232 if (cl->GetType()==2 || cl->GetType()==11 ){
233 erry = TMath::Min(0.0010*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.05)*scale;
234 errz = TMath::Min(0.025*(1+chargematch+cl->GetNy()+cl->GetNz()-nz+ny),0.5)*scale;
238 if (cl->GetType()>100 ){
239 if ((chargematch+cl->GetNy()+cl->GetNz()-nz-ny<1.5)){
241 erry = 0.00096*scale;
244 if (cl->GetNy()+cl->GetNz()-nz-ny<1){
250 errz = TMath::Min(0.05*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.4)*scale;
251 erry = TMath::Min(0.003*(chargematch+cl->GetNy()+cl->GetNz()-nz-ny),0.05)*scale;
254 Float_t diff = cl->GetNy()+cl->GetNz()-ny-nz;
258 if (cl->GetType()==5||cl->GetType()==6||cl->GetType()==7||cl->GetType()==8){
268 Float_t normq = cl->GetQ()/(TMath::Sqrt(1+tgl*tgl+tgphitr*tgphitr));
269 Float_t chargematch = normq/expQ;
270 chargematch/=2.4; // F. Prino Sept. 2007: SDD charge conversion keV->ADC
272 Int_t cnz = cl->GetNz()%10;
274 if (cl->GetType()==1){
275 if (chargematch<1.25){
276 erry = 0.0028*(1.+6./cl->GetQ()); // gold clusters
279 erry = 0.003*chargematch;
280 if (cl->GetNz()==3) erry*=1.5;
282 if (chargematch<1.0){
283 errz = 0.0011*(1.+6./cl->GetQ());
286 errz = 0.002*(1+2*(chargematch-1.));
290 errz*=1.4*(cnz-nz+0.5);
293 if (cl->GetType()>1){
295 erry = 0.00385*(1.+6./cl->GetQ()); // gold clusters
296 errz = 0.0016*(1.+6./cl->GetQ());
299 errz = 0.0014*(1+3*(chargematch-1.));
300 erry = 0.003*(1+3*(chargematch-1.));
304 errz*=1.4*(cnz-nz+0.5);
308 if (TMath::Abs(cl->GetY())>2.5){
309 factorz*=1+2*(TMath::Abs(cl->GetY())-2.5);
311 if (TMath::Abs(cl->GetY())<1){
312 factorz*=1.+0.5*TMath::Abs(TMath::Abs(cl->GetY())-1.);
314 factorz= TMath::Min(factorz,float(4.));
317 erry= TMath::Min(erry,float(0.05));
318 errz= TMath::Min(errz,float(0.05));
321 //--------------------------------------------------------------------------
322 Int_t AliITSClusterParam::GetErrorParamAngle(Int_t layer,
323 const AliITSRecPoint *cl,
324 Float_t tgl,Float_t tgphitr,
325 Float_t &erry,Float_t &errz)
328 // Calculate cluster position error (parametrization extracted from rp-hit
329 // residuals, as a function of angle between track and det module plane.
330 // Origin: M.Lunardon, S.Moretto)
333 Double_t maxSigmaSPDx=100.;
334 Double_t maxSigmaSPDz=400.;
335 Double_t maxSigmaSDDx=100.;
336 Double_t maxSigmaSDDz=400.;
337 Double_t maxSigmaSSDx=100.;
338 Double_t maxSigmaSSDz=1000.;
340 Double_t paramSPDx[3]={-6.417,0.18,11.14};
341 Double_t paramSPDz[2]={118.,-0.155};
342 Double_t paramSDDx[2]={30.93,0.059};
343 Double_t paramSDDz[2]={33.09,0.011};
344 Double_t paramSSDx[2]={18.64,-0.0046};
345 Double_t paramSSDz[2]={784.4,-0.828};
346 Double_t sigmax=1000.0,sigmaz=1000.0;
348 Int_t volId = (Int_t)cl->GetVolumeId();
349 Double_t tra[3]; AliGeomManager::GetOrigTranslation(volId,tra);
350 Double_t rot[9]; AliGeomManager::GetOrigRotation(volId,rot);
353 Double_t phitr = TMath::ATan(tgphitr);
354 Double_t alpha = TMath::ATan2(tra[1],tra[0]);
355 Double_t phiglob = alpha+phitr;
357 p[0] = TMath::Cos(phiglob);
358 p[1] = TMath::Sin(phiglob);
360 TVector3 pvec(p[0],p[1],p[2]);
361 TVector3 normvec(rot[1],rot[4],rot[7]);
362 Double_t angle = pvec.Angle(normvec);
363 if(angle>0.5*TMath::Pi()) angle = TMath::Pi()-angle;
364 Double_t angleDeg = angle*180./TMath::Pi();
366 if(layer==0 || layer==1) { // SPD
368 sigmax = TMath::Exp(angleDeg*paramSPDx[1]+paramSPDx[0])+paramSPDx[2];
369 sigmaz = paramSPDz[0]+paramSPDz[1]*angleDeg;
370 if(sigmax > maxSigmaSPDx) sigmax = maxSigmaSPDx;
371 if(sigmaz > maxSigmaSPDz) sigmax = maxSigmaSPDz;
373 } else if(layer==2 || layer==3) { // SDD
375 sigmax = angleDeg*paramSDDx[1]+paramSDDx[0];
376 sigmaz = paramSDDz[0]+paramSDDz[1]*angleDeg;
377 if(sigmax > maxSigmaSDDx) sigmax = maxSigmaSDDx;
378 if(sigmaz > maxSigmaSDDz) sigmax = maxSigmaSDDz;
380 } else if(layer==4 || layer==5) { // SSD
382 sigmax = angleDeg*paramSSDx[1]+paramSSDx[0];
383 sigmaz = paramSSDz[0]+paramSSDz[1]*angleDeg;
384 if(sigmax > maxSigmaSSDx) sigmax = maxSigmaSSDx;
385 if(sigmaz > maxSigmaSSDz) sigmax = maxSigmaSSDz;
389 // convert from micron to cm
395 //--------------------------------------------------------------------------
396 void AliITSClusterParam::Print(Option_t* /*option*/) const {
398 // Print param Information
402 // Error parameterization
404 printf("NOT YET...\n");