PWG3/vertexingHF/AliHFSystErr.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2010, 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 //
  18 // Class to handle systematic errors for charm hadrons
  19 //
  20 // Usage:
  21 // AliHFSystEff syst(DECAY); // DECAY = 1 for D0, 2, for D+, 3 for D*
  22 // syst.DrawErrors(); // to see a plot of the error contributions
  23 // syst.GetTotalSystErr(pt); // to get the total err at pt
  24 //
  25 // Author: A.Dainese, andrea.dainese@pd.infn.it
  26 /////////////////////////////////////////////////////////////
  27
  28 #include <TStyle.h>
  29 #include <TGraphAsymmErrors.h>
  30 #include <TMath.h>
  31 #include <TCanvas.h>
  32 #include <TH2F.h>
  33 #include <TLegend.h>
  34 #include <TColor.h>
  35
  36 #include "AliHFSystErr.h"
  37
  38
  39 ClassImp(AliHFSystErr)
  40
  41 //--------------------------------------------------------------------------
  42 AliHFSystErr::AliHFSystErr(const Char_t* name, const Char_t* title) :
  43 TNamed(name,title),
  44 fNorm(0),
  45 fRawYield(0),
  46 fTrackingEff(0),
  47 fBR(0),
  48 fCutsEff(0),
  49 fPIDEff(0),
  50 fMCPtShape(0),
  51 fPartAntipart(0)
  52 {
  53   //
  54   // Default Constructor
  55   //
  56 }
  57 //--------------------------------------------------------------------------
  58 AliHFSystErr::AliHFSystErr(Int_t decay,const Char_t* name, const Char_t* title) :
  59 TNamed(name,title),
  60 fNorm(0),
  61 fRawYield(0),
  62 fTrackingEff(0),
  63 fBR(0),
  64 fCutsEff(0),
  65 fPIDEff(0),
  66 fMCPtShape(0),
  67 fPartAntipart(0)
  68 {
  69   //
  70   // Standard Constructor
  71   //
  72
  73   switch(decay) {
  74   case 1: // D0->Kpi
  75     InitD0toKpi();
  76     break;
  77   case 2: // D+->Kpipi
  78     InitDplustoKpipi();
  79     break;
  80   case 3: // D*->D0pi
  81     InitDstartoD0pi();
  82     break;
  83   default:
  84     printf("Invalid decay type: %d\n",decay);
  85     break;
  86   }
  87
  88
  89 }
  90 //--------------------------------------------------------------------------
  91 AliHFSystErr::~AliHFSystErr() {
  92   //
  93   // Default Destructor
  94   //
  95
  96   if(fNorm)         { delete fNorm; fNorm=0; }
  97   if(fRawYield)     { delete fRawYield; fRawYield=0; }
  98   if(fTrackingEff)  { delete fTrackingEff; fTrackingEff=0; }
  99   if(fBR)           { delete fBR; fBR=0; }
 100   if(fCutsEff)      { delete fCutsEff; fCutsEff=0; }
 101   if(fPIDEff)       { delete fPIDEff; fPIDEff=0; }
 102   if(fMCPtShape)    { delete fMCPtShape; fMCPtShape=0; }
 103   if(fPartAntipart) { delete fPartAntipart; fPartAntipart=0; }
 104
 105 }
 106 //--------------------------------------------------------------------------
 107 void AliHFSystErr::InitD0toKpi() {
 108   //
 109   // D0->Kpi syst errors. Responsible: A. Rossi
 110   //
 111
 112   // Normalization
 113   fNorm = new TH1F("fNorm","fNorm",20,0,20);
 114   for(Int_t i=4;i<=20;i++) fNorm->SetBinContent(i,0.10); // 10% error on sigmaV0and
 115
 116   // Branching ratio
 117   fBR = new TH1F("fBR","fBR",20,0,20);
 118   for(Int_t i=4;i<=20;i++) fBR->SetBinContent(i,0.012); // 1.2% PDG2010
 119
 120   // Tracking efficiency
 121   fTrackingEff = new TH1F("fTrackingEff","fTrackingEff",20,0,20);
 122   for(Int_t i=4;i<=20;i++) fTrackingEff->SetBinContent(i,0.02); // 2% (1% per track)
 123
 124   // Raw yield extraction
 125   fRawYield = new TH1F("fRawYield","fRawYield",20,0,20);
 126   fRawYield->SetBinContent(1,1);
 127   fRawYield->SetBinContent(2,1);
 128   fRawYield->SetBinContent(3,0.15);
 129   for(Int_t i=4;i<=20;i++) fRawYield->SetBinContent(i,0.065);
 130
 131   // Cuts efficiency (from cuts variation)
 132   fCutsEff = new TH1F("fCutsEff","fCutsEff",20,0,20);
 133   for(Int_t i=1;i<=20;i++) fCutsEff->SetBinContent(i,0.10); // 10%
 134
 135   // PID efficiency (from PID/noPID)
 136   fPIDEff = new TH1F("fPIDEff","fPIDEff",20,0,20);
 137   for(Int_t i=1;i<=20;i++) fPIDEff->SetBinContent(i,0.03); // 3%
 138   fPIDEff->SetBinContent(4,0.15); // 15%
 139
 140   // MC dN/dpt
 141   fMCPtShape = new TH1F("fMCPtShape","fMCPtShape",20,0,20);
 142   for(Int_t i=1;i<=20;i++) fMCPtShape->SetBinContent(i,(Float_t)i*0.006);
 143
 144   // particle-antiparticle
 145   fPartAntipart = new TH1F("fPartAntipart","fPartAntipart",20,0,20);
 146   fPartAntipart->SetBinContent(1,1);
 147   fPartAntipart->SetBinContent(2,1);
 148   fPartAntipart->SetBinContent(3,0.20);
 149   for(Int_t i=4;i<=20;i++) fPartAntipart->SetBinContent(i,0.05);
 150
 151   return;
 152 }
 153 //--------------------------------------------------------------------------
 154 void AliHFSystErr::InitDplustoKpipi() {
 155   //
 156   // D+->Kpipi syst errors. Responsible: R. Bala
 157   //
 158
 159  // Normalization
 160   fNorm = new TH1F("fNorm","fNorm",20,0,20);
 161   for(Int_t i=4;i<=20;i++) fNorm->SetBinContent(i,0.10); // 10% error on sigmaV0and
 162
 163   // Branching ratio
 164   fBR = new TH1F("fBR","fBR",20,0,20);
 165   for(Int_t i=4;i<=20;i++) fBR->SetBinContent(i,0.04); // 4% PDG2010
 166
 167   // Tracking efficiency
 168   fTrackingEff = new TH1F("fTrackingEff","fTrackingEff",20,0,20);
 169   for(Int_t i=4;i<=20;i++) fTrackingEff->SetBinContent(i,0.03); // 3% (1% per track)
 170
 171
 172   // Raw yield extraction
 173   fRawYield = new TH1F("fRawYield","fRawYield",20,0,20);
 174   fRawYield->SetBinContent(1,1);
 175   fRawYield->SetBinContent(2,1);
 176   fRawYield->SetBinContent(3,0.10);
 177   for(Int_t i=4;i<=20;i++) fRawYield->SetBinContent(i,0.055);  //5 to 10%
 178
 179   // Cuts efficiency (from cuts variation)
 180   fCutsEff = new TH1F("fCutsEff","fCutsEff",20,0,20);
 181   for(Int_t i=1;i<=20;i++) fCutsEff->SetBinContent(i,0.10); // 10%
 182
 183   // PID efficiency (from PID/noPID)
 184   fPIDEff = new TH1F("fPIDEff","fPIDEff",20,0,20);
 185   for(Int_t i=1;i<=20;i++) fPIDEff->SetBinContent(i,0.05); // 5%
 186   fPIDEff->SetBinContent(3,0.13); // 13%
 187
 188
 189   // MC dN/dpt  (copied from D0 : will update later)
 190   fMCPtShape = new TH1F("fMCPtShape","fMCPtShape",20,0,20);
 191   for(Int_t i=1;i<=20;i++) fMCPtShape->SetBinContent(i,(Float_t)i*0.006);
 192
 193
 194   // particle-antiparticle
 195   /*
 196   fPartAntipart = new TH1F("fPartAntipart","fPartAntipart",20,0,20);
 197   fPartAntipart->SetBinContent(1,1);
 198   fPartAntipart->SetBinContent(2,1);
 199   fPartAntipart->SetBinContent(3,0.12);
 200   for(Int_t i=4;i<=20;i++) fPartAntipart->SetBinContent(i,0.05);   //5 to 12%
 201   */
 202   return;
 203 }
 204 //--------------------------------------------------------------------------
 205 void AliHFSystErr::InitDstartoD0pi() {
 206   //
 207   // D*+->D0pi syst errors. Responsible: tbd
 208   //
 209
 210   return;
 211 }
 212 //--------------------------------------------------------------------------
 213 Double_t AliHFSystErr::GetCutsEffErr(Double_t pt) const {
 214   //
 215   // Get error
 216   //
 217
 218   Int_t bin=fCutsEff->FindBin(pt);
 219
 220   return fCutsEff->GetBinContent(bin);
 221 }
 222 //--------------------------------------------------------------------------
 223 Double_t AliHFSystErr::GetMCPtShapeErr(Double_t pt) const {
 224   //
 225   // Get error
 226   //
 227
 228   Int_t bin=fMCPtShape->FindBin(pt);
 229
 230   return fMCPtShape->GetBinContent(bin);
 231 }
 232 //--------------------------------------------------------------------------
 233 Double_t AliHFSystErr::GetSeleEffErr(Double_t pt) const {
 234   //
 235   // Get error
 236   //
 237
 238   Double_t err=GetCutsEffErr(pt)*GetCutsEffErr(pt)+GetMCPtShapeErr(pt)*GetMCPtShapeErr(pt);
 239
 240   return TMath::Sqrt(err);
 241 }
 242 //--------------------------------------------------------------------------
 243 Double_t AliHFSystErr::GetPIDEffErr(Double_t pt) const {
 244   //
 245   // Get error
 246   //
 247
 248   Int_t bin=fPIDEff->FindBin(pt);
 249
 250   return fPIDEff->GetBinContent(bin);
 251 }
 252 //--------------------------------------------------------------------------
 253 Double_t AliHFSystErr::GetTrackingEffErr(Double_t pt) const {
 254   //
 255   // Get error
 256   //
 257
 258   Int_t bin=fTrackingEff->FindBin(pt);
 259
 260   return fTrackingEff->GetBinContent(bin);
 261 }
 262 //--------------------------------------------------------------------------
 263 Double_t AliHFSystErr::GetRawYieldErr(Double_t pt) const {
 264   //
 265   // Get error
 266   //
 267
 268   Int_t bin=fRawYield->FindBin(pt);
 269
 270   return fRawYield->GetBinContent(bin);
 271 }
 272 //--------------------------------------------------------------------------
 273 Double_t AliHFSystErr::GetPartAntipartErr(Double_t pt) const {
 274   //
 275   // Get error
 276   //
 277
 278   Int_t bin=fPartAntipart->FindBin(pt);
 279
 280   return fPartAntipart->GetBinContent(bin);
 281 }
 282 //--------------------------------------------------------------------------
 283 Double_t AliHFSystErr::GetTotalSystErr(Double_t pt,Double_t feeddownErr) const {
 284   //
 285   // Get total syst error (except norm. error)
 286   //
 287
 288   Double_t err=0.;
 289
 290   if(fRawYield) err += GetRawYieldErr(pt)*GetRawYieldErr(pt);
 291   if(fTrackingEff) err += GetTrackingEffErr(pt)*GetTrackingEffErr(pt);
 292   if(fBR) err += GetBRErr()*GetBRErr();
 293   if(fCutsEff) err += GetCutsEffErr(pt)*GetCutsEffErr(pt);
 294   if(fPIDEff) err += GetPIDEffErr(pt)*GetPIDEffErr(pt);
 295   if(fMCPtShape) err += GetMCPtShapeErr(pt)*GetMCPtShapeErr(pt);
 296   if(fPartAntipart) err += GetPartAntipartErr(pt)*GetPartAntipartErr(pt);
 297
 298   err += feeddownErr*feeddownErr;
 299
 300   return TMath::Sqrt(err);
 301 }
 302 //---------------------------------------------------------------------------
 303 void AliHFSystErr::DrawErrors(TGraphAsymmErrors *grErrFeeddown) const {
 304   //
 305   // Draw errors
 306   //
 307   gStyle->SetOptStat(0);
 308
 309   TCanvas *cSystErr = new TCanvas("cSystErr","Systematic Errors",0,0,500,500);
 310   cSystErr->SetFillColor(0);
 311
 312   TH2F *hFrame = new TH2F("hFrame","Systematic errors; p_{t} [GeV/c]; Relative Error",20,0,20,100,0,+1);
 313   hFrame->SetAxisRange(2.,11.9,"X");
 314   hFrame->SetAxisRange(0.,0.5,"Y");
 315   hFrame->Draw();
 316
 317   TLegend *leg=new TLegend(0.5,0.5,0.9,0.9);
 318   leg->SetFillStyle(0);
 319   leg->SetBorderSize(0);
 320
 321   if(fNorm) {
 322     fNorm->SetFillColor(1);
 323     fNorm->SetFillStyle(3002);
 324     fNorm->Draw("same");
 325     leg->AddEntry(fNorm,"Normalization","f");
 326   }
 327   if(grErrFeeddown) {
 328     grErrFeeddown->SetFillColor(kTeal-8);
 329     grErrFeeddown->SetFillStyle(3001);
 330     grErrFeeddown->Draw("2");
 331     leg->AddEntry(grErrFeeddown,"Feed-down from B","f");
 332   }
 333   if(fTrackingEff) {
 334     fTrackingEff->SetFillColor(4);
 335     fTrackingEff->SetFillStyle(3006);
 336     fTrackingEff->Draw("same");
 337     leg->AddEntry(fTrackingEff,"Tracking efficiency","f");
 338   }
 339   if(fBR) {
 340     fBR->SetFillColor(6);
 341     fBR->SetFillStyle(3005);
 342     //fBR->SetFillStyle(3020);
 343     fBR->Draw("same");
 344     leg->AddEntry(fBR,"Branching ratio","f");
 345   }
 346   if(fRawYield) {
 347     Int_t ci;   // for color index setting
 348     ci = TColor::GetColor("#00cc00");
 349     fRawYield->SetLineColor(ci);
 350     //    fRawYield->SetLineColor(3);
 351     fRawYield->SetLineWidth(3);
 352     fRawYield->Draw("same");
 353     leg->AddEntry(fRawYield,"Inv. mass analysis","l");
 354   }
 355   if(fCutsEff) {
 356     fCutsEff->SetLineColor(4);
 357     fCutsEff->SetLineWidth(3);
 358     fCutsEff->Draw("same");
 359     leg->AddEntry(fCutsEff,"Cuts efficiency","l");
 360   }
 361   if(fPIDEff) {
 362     fPIDEff->SetLineColor(7);
 363     fPIDEff->SetLineWidth(3);
 364     fPIDEff->Draw("same");
 365     leg->AddEntry(fPIDEff,"PID efficiency","l");
 366   }
 367   if(fMCPtShape) {
 368     Int_t ci = TColor::GetColor("#9933ff");
 369     fMCPtShape->SetLineColor(ci);
 370     //    fMCPtShape->SetLineColor(8);
 371     fMCPtShape->SetLineWidth(3);
 372     fMCPtShape->Draw("same");
 373     leg->AddEntry(fMCPtShape,"MC p_{t} shape","l");
 374   }
 375   if(fPartAntipart) {
 376     Int_t ci = TColor::GetColor("#ff6600");
 377     fPartAntipart->SetLineColor(ci);
 378     //    fPartAntipart->SetLineColor(9);
 379     fPartAntipart->SetLineWidth(3);
 380     fPartAntipart->Draw("same");
 381     leg->AddEntry(fPartAntipart,"D = #bar{D}","l");
 382   }
 383
 384
 385   TH1F *hTotErr=new TH1F("hTotErr","",20,0,20);
 386   for(Int_t i=1;i<=20;i++) {
 387     Double_t pt=hTotErr->GetBinCenter(i);
 388     if(grErrFeeddown) {
 389       Double_t x=0., y=0., erryh = 0.;
 390       for(Int_t j=0; j<grErrFeeddown->GetN(); j++) {
 391         grErrFeeddown->GetPoint(j,x,y);
 392         if ( TMath::Abs(x - pt) < 0.5) erryh = grErrFeeddown->GetErrorYhigh(j);
 393       }
 394       hTotErr->SetBinContent(i,GetTotalSystErr(pt,erryh));
 395     } else {
 396       hTotErr->SetBinContent(i,GetTotalSystErr(pt));
 397     }
 398   }
 399   hTotErr->SetLineColor(1);
 400   hTotErr->SetLineWidth(3);
 401   hTotErr->Draw("same");
 402   leg->AddEntry(hTotErr,"Total (excl. norm.)","l");
 403
 404
 405   leg->Draw();
 406
 407   cSystErr->SaveAs("RelativeSystematics.eps");
 408
 409   return;
 410 }