TPC/AliTPCPid.cxx

   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 /* $Id$ */
  17
  18 #include "AliTPCPid.h"
  19 #include "TMath.h"
  20 //#include <TVector.h>
  21 #include <TF1.h>
  22 #include <TClonesArray.h>
  23 //#include "AliITSIOTrack.h"
  24 #include "AliKalmanTrack.h"
  25 #include "Riostream.h"
  26 ClassImp(AliTPCPid)
  27 // Correction 13.01.2003 Z.S.,Dubna
  28 //            22.01.2003
  29 //------------------------------------------------------------
  30 // pid class by B. Batyunya
  31 // stupid corrections by M.K.
  32 //
  33 //________________________________________________________
  34   AliTPCPid::AliTPCPid( const AliTPCPid& r):TObject(r)
  35 {
  36   // dummy copy constructor
  37 }
  38 Float_t AliTPCPid::Qcorr(Float_t xc)
  39 {
  40   //
  41   // charge correction
  42   //
  43     assert(0);
  44   Float_t fcorr;
  45   fcorr=( 0.766 +0.9692*xc -1.267*xc*xc )*( 1.-TMath::Exp(-xc*64.75) );
  46   if(fcorr<=0.1)fcorr=0.1;
  47 return fqtot/fcorr;
  48 }
  49 //-----------------------------------------------------------
  50 Float_t AliTPCPid::Qtrm(Int_t track) const
  51 {
  52   //
  53   // dummy comment (Boris!!!)
  54   //
  55     TVector q(*( this->GetVec(track)  ));
  56     Int_t ml=(Int_t)q(0);
  57     if(ml<1)return 0.;
  58     if(ml>6)ml=6;
  59     float vf[6];
  60     Int_t nl=0; for(Int_t i=0;i<ml;i++){if(q(i)>fSigmin){vf[nl]=q(i+1);nl++;}}
  61     if(nl==0)return 0.;
  62     switch(nl){
  63       case  1:q(6)=q(1); break;
  64       case  2:q(6)=(q(1)+q(2))/2.; break;
  65       default:
  66         for(int fi=0;fi<2;fi++){
  67           Int_t swap;
  68           do{ swap=0; float qmin=vf[fi];
  69           for(int j=fi+1;j<nl;j++)
  70             if(qmin>vf[j]){qmin=vf[j];vf[j]=vf[fi];vf[fi]=qmin;swap=1;};
  71           }while(swap==1);
  72         }
  73         q(6)= (vf[0]+vf[1])/2.;
  74         break;
  75     }
  76     for(Int_t i=0;i<nl;i++){q(i+1)=vf[i];} this->SetVec(track,q);
  77     return (q(6));
  78 }// --- End AliTPCPid::Qtrm ---
  79
  80 Float_t AliTPCPid::Qtrm(Float_t qarr[6],Int_t narr)
  81 {
  82   //..................
  83   Float_t q[6],qm,qmin;
  84   Int_t nl,ml;
  85   if(narr>0&&narr<7){ml=narr;}else{return 0;};
  86   nl=0; for(Int_t i=0;i<ml;i++){if(qarr[i]>fSigmin){q[nl]=qarr[i];nl++;}}
  87   if(nl==0)return 0.;
  88     switch(nl){
  89       case  1:qm=q[0]; break;
  90       case  2:qm=(q[0]+q[1])/2.; break;
  91       default:
  92         Int_t swap;
  93         for(int fi=0;fi<2;fi++){
  94           do{ swap=0; qmin=q[fi];
  95           for(int j=fi+1;j<nl;j++)
  96             if(qmin>q[j]){qmin=q[j];q[j]=q[fi];q[fi]=qmin;swap=1;};
  97           }while(swap==1);
  98         }
  99         qm= (q[0]+q[1])/2.;
 100         break;
 101     }
 102     return qm;
 103 }// --- End AliTPCPid::Qtrm  ---
 104
 105 Int_t   AliTPCPid::Wpik(Int_t nc,Float_t q)
 106 {
 107   //
 108   //  pi-k
 109   //
 110     Float_t qmpi,qmk,sigpi,sigk,dpi,dk,ppi,pk;
 111     Float_t appi,apk;
 112     qmpi =fcut[nc][1];
 113     sigpi=fcut[nc][2];
 114     qmk  =fcut[nc][3];
 115     sigk =fcut[nc][4];
 116     appi = faprob[0][nc-5];
 117     apk  = faprob[1][nc-5];
 118     if( !fSilent ){
 119     cout<<"qmpi,sigpi,qmk,sigk="<<qmpi<<"  "<<sigpi<<"  "<<qmk<<"  "<<sigk<<endl;
 120     cout<<"appi,apk="<<appi<<","<<apk<<endl;
 121     }
 122     Float_t dqpi=(q-qmpi)/sigpi;
 123     Float_t dqk =(q-qmk )/sigk;
 124     dpi =TMath::Abs(dqpi);
 125     dk  =TMath::Abs(dqk);
 126     Double_t dn=appi*TMath::Gaus(q,qmpi,sigpi)+apk*TMath::Gaus(q,qmk,sigk);
 127     if(dn>0.){
 128       ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 129       pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 130     }else{fWpi=1;return Pion();}
 131     Float_t rpik=ppi/(pk+0.0000001);
 132     if( !fSilent )
 133         cout<<"q,dqpi,dqk, Wpik: ppi,pk,rpik="
 134         <<q<<"  "<<dqpi<<"  "<<dqk<<"  "<<ppi<<"  "<<pk<<"  "<<rpik<<endl;
 135
 136     fWp=0.; fWpi=ppi; fWk=pk;
 137     if( pk>ppi){return Kaon();}else{return Pion();}
 138 }
 139 //-----------------------------------------------------------
 140 Int_t   AliTPCPid::Wpikp(Int_t nc,Float_t q)
 141 {
 142   //
 143   // pi-k-p
 144   //
 145    Float_t qmpi,qmk,qmp,sigpi,sigk,sigp,ppi,pk,pp;
 146    Float_t appi,apk,app;
 147
 148     qmpi =fcut[nc][1];
 149     sigpi=fcut[nc][2];
 150     qmk  =fcut[nc][3];
 151     sigk =fcut[nc][4];
 152     qmp  =fcut[nc][5];
 153     sigp =fcut[nc][6];
 154
 155     //appi = apk = app = 1.;
 156     appi = faprob[0][nc-5];
 157     apk  = faprob[1][nc-5];
 158     app  = faprob[2][nc-5];
 159
 160     Double_t dn= appi*TMath::Gaus(q,qmpi,sigpi)
 161       +apk*TMath::Gaus(q,qmk,sigk)+app*TMath::Gaus(q,qmp,sigp);
 162     if(dn>0.){
 163     ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 164     pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 165     pp = app*TMath::Gaus(q,qmp, sigp )/dn;
 166      }
 167     else{fWpi=1;return Pion();}
 168     fWp=pp; fWpi=ppi; fWk=pk;
 169     if( !fSilent ){
 170 cout<<" Wpikp: mid,sig pi,k,p="<<qmpi<<" "<<sigpi<<";   "<<qmk<<" "<<sigk<<";   "
 171     <<qmp<<" "<<sigp<<"; "<<endl;
 172 cout<<" faprob: "<<appi<<"  "<<apk<<"  "<<app<<endl;
 173 cout<<" ppi,pk,pp="<<ppi<<"  "<<pk<<"  "<<pp<<endl;
 174      }
 175     if( ppi>pk&&ppi>pp )  { return Pion(); }
 176     if(pk>pp){return Kaon();}else{return Proton();}
 177 }
 178 //-----------------------------------------------------------
 179 Int_t   AliTPCPid::GetPcode(TClonesArray* /*rps*/,Float_t /*pm*/) const
 180 {
 181   //
 182   // dummy ???
 183   //
 184     return 0;
 185 }
 186 //-----------------------------------------------------------
 187 Int_t   AliTPCPid::GetPcode(AliTPCtrack *track)
 188 {
 189   //
 190   // get particle code
 191   //
 192       Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 193       Float_t phi=TMath::ASin(par[2]) + track->GetAlpha();
 194       if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
 195       if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
 196       Float_t lam=TMath::ATan(par[3]);
 197       Float_t pt1=TMath::Abs(par[4]);
 198       Float_t mom=1./(pt1*TMath::Cos(lam));
 199       Float_t dedx=track->GetdEdx();
 200     Int_t pcode=GetPcode(dedx/40.,mom);
 201     cout<<"TPCtrack dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 202     return pcode?pcode:211;
 203     }
 204
 205 //-----------------------------------------------------------
 206 Int_t   AliTPCPid::GetPcode(AliKalmanTrack *track)
 207 {
 208   //
 209   // get particle code
 210   //
 211   if(track==0)return 0;
 212   //      track->Propagate(track->GetAlpha(),3.,0.1/65.19*1.848,0.1*1.848);
 213       track->PropagateTo(3.,0.0028,65.19);
 214       track->PropagateToVertex();
 215     Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 216     Float_t lam=TMath::ATan(par[3]);
 217     Float_t pt1=TMath::Abs(par[4]);
 218     Float_t mom=0.;
 219     if( (pt1*TMath::Cos(lam))!=0. ){ mom=1./(pt1*TMath::Cos(lam)); }else{mom=0.;};
 220     Float_t dedx=track->GetPIDsignal();
 221     cout<<"lam,pt1,mom,dedx="<<lam<<","<<pt1<<","<<mom<<","<<dedx<<endl;
 222     Int_t pcode=GetPcode(dedx,mom);
 223     cout<<"ITS V2 dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 224 return pcode?pcode:211;
 225 }
 226
 227 //-----------------------------------------------------------
 228 Int_t   AliTPCPid::GetPcode(Float_t q,Float_t pm)
 229 {
 230   //
 231   // get particle code
 232   //
 233     fWpi=fWk=fWp=0.;     fPcode=0;
 234 //1)---------------------- 0-120 MeV/c --------------
 235     if ( pm<=fcut[1][0] )
 236         { fWpi=1.; return Pion(); }
 237 //2)----------------------120-200 Mev/c ( 29.7.2002 ) -------------
 238     if ( pm<=fcut[2][0] )
 239         { if( q<fCutKa->Eval(pm) ){fWpi=1.; return Pion(); }
 240                              else {fWk =1.; return  Kaon();} }
 241 //3)----------------------200-400 Mev/c -------------
 242     if ( pm<=fcut[3][0] )
 243         if( q<fCutKa->Eval(pm) )
 244                 { fWpi=1.;return Pion(); }
 245              else
 246                 { if ( q<=fCutPr->Eval(pm) )
 247                              {fWk=1.;return Kaon();}
 248                         else {fWp=1.;return Proton();}
 249                 }
 250 //4)----------------------400-450 Mev/c -------------
 251     if ( pm<=fcut[4][0] )
 252         if( q<fCutKaTune*fCutKa->Eval(pm) )
 253                 { fWpi=1.;return Pion(); }
 254             else
 255                 { if( q<fCutPr->Eval(pm) )
 256                   {fWk=1.;return Kaon();} else {fWp=1.;return Proton(); }
 257                 }
 258 //5)----------------------450-500 Mev/c -------------
 259     if ( pm<=fcut[5][0] )
 260         if ( q>fCutPr->Eval(pm) )
 261            {fWp=1.;return Proton();} else {return Wpik(5,q);};
 262 //6)----------------------500-550 Mev/c -------------
 263     if ( pm<=fcut[6][0] )
 264         if ( q>fCutPr->Eval(pm) )
 265            {fWp=1.;return Proton();} else {return Wpik(6,q);};
 266 //7)----------------------550-600 Mev/c -------------
 267     if ( pm<=fcut[7][0] )
 268         if ( q>fCutPr->Eval(pm) )
 269            {fWp=1.;return Proton();} else {return Wpik(7,q);};
 270 //8)----------------------600-650 Mev/c -------------
 271     if ( pm<=fcut[8][0] )
 272       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 273                                      else {return Wpik(8,q);};
 274 //9)----------------------650-730 Mev/c -------------
 275     if ( pm<=fcut[9][0] )
 276       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 277                                      else {return Wpik(9,q);};
 278 //10)----------------------730-830 Mev/c -------------
 279     if( pm<=fcut[10][0] )
 280       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 281                                      else {return Wpik(10,q);};
 282 //11)----------------------830-930 Mev/c -------------
 283     if( pm<=fcut[11][0] ){ return Wpikp(11,q); }
 284 //12)----------------------930-1030 Mev/c -------------
 285     if( pm<=fcut[12][0] )
 286      { return Wpikp(12,q); };
 287
 288     return fPcode;
 289 }
 290 //-----------------------------------------------------------
 291 void    AliTPCPid::SetCut(Int_t n,Float_t pm,Float_t pilo,Float_t pihi,
 292                         Float_t klo,Float_t khi,Float_t plo,Float_t phi)
 293 {
 294   //
 295   // set cuts
 296   //
 297     fcut[n][0]=pm;
 298     fcut[n][1]=pilo;
 299     fcut[n][2]=pihi;
 300     fcut[n][3]=klo;
 301     fcut[n][4]=khi;
 302     fcut[n][5]=plo;
 303     fcut[n][6]=phi;
 304     return ;
 305 }
 306 //------------------------------------------------------------
 307 void AliTPCPid::SetVec(Int_t ntrack,TVector info) const
 308 {
 309   //
 310   // new track vector
 311   //
 312 TClonesArray& arr=*trs;
 313     new( arr[ntrack] ) TVector(info);
 314 }
 315 //-----------------------------------------------------------
 316 TVector* AliTPCPid::GetVec(Int_t ntrack) const
 317 {
 318   //
 319   // get track vector
 320   //
 321 TClonesArray& arr=*trs;
 322     return (TVector*)arr[ntrack];
 323 }
 324 //-----------------------------------------------------------
 325 void AliTPCPid::SetEdep(Int_t track,Float_t Edep)
 326 {
 327   //
 328   // energy deposit
 329   //
 330     TVector xx(0,11);
 331     if( ((TVector*)trs->At(track))->IsValid() )
 332         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 333     Int_t j=(Int_t)xx(0); if(j>4)return;
 334     xx(++j)=Edep;xx(0)=j;
 335     TClonesArray &arr=*trs;
 336     new(arr[track])TVector(xx);
 337 }
 338 //-----------------------------------------------------------
 339 void AliTPCPid::SetPmom(Int_t track,Float_t Pmom)
 340 {
 341   //
 342   // set part. momentum
 343   //
 344     TVector xx(0,11);
 345     if( ((TVector*)trs->At(track))->IsValid() )
 346         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 347     xx(10)=Pmom;
 348     TClonesArray &arr=*trs;
 349     new(arr[track])TVector(xx);
 350 }
 351 //-----------------------------------------------------------
 352 void AliTPCPid::SetPcod(Int_t track,Int_t partcode)
 353 {
 354   //
 355   // set part. code
 356   //
 357     TVector xx(0,11);
 358     if( ((TVector*)trs->At(track))->IsValid() )
 359         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 360     if(xx(11)==0)
 361         {xx(11)=partcode; fmxtrs++;
 362         TClonesArray &arr=*trs;
 363         new(arr[track])TVector(xx);
 364         }
 365 }
 366 //-----------------------------------------------------------
 367 void AliTPCPid::Print(Int_t track)
 368 {
 369   //
 370   // control print
 371   //
 372 cout<<fmxtrs<<" tracks in AliITSPid obj."<<endl;
 373     if( ((TVector*)trs->At(track))->IsValid() )
 374         {TVector xx( *((TVector*)trs->At(track)) );
 375          xx.Print();
 376          }
 377     else
 378         {cout<<"No data for track "<<track<<endl;return;}
 379 }
 380 //-----------------------------------------------------------
 381 void AliTPCPid::Tab(void)
 382 {
 383   //
 384   // fill table
 385   //
 386 if(trs->GetEntries()==0){cout<<"No entries in TAB"<<endl;return;}
 387 cout<<"------------------------------------------------------------------------"<<endl;
 388 cout<<"Nq"<<"   q1  "<<"   q2  "<<"   q3  "<<"   q4  "<<"   q5   "<<
 389       " Qtrm    "    <<"  Wpi  "<<"  Wk   "<<"  Wp  "<<"Pmom  "<<endl;
 390 cout<<"------------------------------------------------------------------------"<<endl;
 391 for(Int_t i=0;i<trs->GetEntries();i++)
 392 {
 393   TVector xx( *((TVector*)trs->At(i)) );
 394     if( xx.IsValid() && xx(0)>0 )
 395         {
 396             TVector xx( *((TVector*)trs->At(i)) );
 397             if(xx(0)>=2)
 398                 {
 399 //       1)Calculate Qtrm
 400                     xx(6)=(this->Qtrm(i));
 401
 402                  }else{
 403                      xx(6)=xx(1);
 404                  }
 405 //       2)Calculate Wpi,Wk,Wp
 406             this->GetPcode(xx(6),xx(10)/1000.);
 407             xx(7)=GetWpi();
 408             xx(8)=GetWk();
 409             xx(9)=GetWp();
 410 //       3)Print table
 411             if(xx(0)>0){
 412                     cout<<xx(0)<<" ";
 413                     for(Int_t j=1;j<11;j++){
 414                         cout.width(7);cout.precision(5);cout<<xx(j);
 415                     }
 416                     cout<<endl;
 417                 }
 418 //        4)Update data in TVector
 419             TClonesArray &arr=*trs;
 420             new(arr[i])TVector(xx);
 421         }
 422     else
 423       {/*cout<<"No data for track "<<i<<endl;*/}
 424 }// End loop for tracks
 425 }
 426 void AliTPCPid::Reset(void)
 427 {
 428   //
 429   // reset
 430   //
 431   for(Int_t i=0;i<trs->GetEntries();i++){
 432     TVector xx(0,11);
 433     TClonesArray &arr=*trs;
 434     new(arr[i])TVector(xx);
 435   }
 436 }
 437 //-----------------------------------------------------------
 438 AliTPCPid::AliTPCPid(Int_t ntrack)
 439 {
 440     trs = new TClonesArray("TVector",ntrack);
 441     TClonesArray &arr=*trs;
 442     for(Int_t i=0;i<ntrack;i++)new(arr[i])TVector(0,11);
 443     fmxtrs=0;
 444
 445     //fCutKa = new TF1("fkaons","[0]/x/x+[1]",0.1,1.2);
 446     //fCutPr = new TF1("fprotons","[0]/x/x +[1]",0.2,1.2);
 447     TF1 *frmska=0;
 448
 449     frmska = new TF1("x_frmska","1.46-7.82*x+16.78*x^2-15.53*x^3+5.24*x^4 ",
 450                 0.1,1.2);
 451     fCutKa = new TF1("fkaons",
 452            "1.25+0.044/x/x+1.25+0.044*x-13.87*x^2+22.37*x^3-10.05*x^4-2.5*x_frmska",
 453            0.1,1.2);
 454     fCutPr = new TF1("fprotons",
 455                      "0.83*(15.32-56.094*x+89.962*x^2-66.1856*x^3+18.4052*x^4)",
 456                      0.2,1.2);
 457     fCutKaTune=1.1; // 0.92;
 458     fCutPrTune=1.0; //0.80;
 459
 460 const int kinf=10;
 461 //         Ncut Pmom   pilo  pihi    klo    khi     plo    phi
 462 //       fcut[j] [0]    [1]    [2]    [3]    [4]     [5]    [6]
 463 //----------------------------------------------------------------
 464     SetCut(  1, 0.120,  0.  ,  0.  , kinf  , kinf   , kinf  , kinf  );
 465     SetCut(  2, 0.200,  0.  ,  6.0 , 6.0  , kinf   , kinf  , kinf  ); //120-200
 466     SetCut(  3, 0.400,  0.  ,  3.5 , 3.5  , 9.0   , 9.0  , kinf  ); //200-400
 467     SetCut(  4, 0.450,  0.  ,  1.9 , 1.9  , 4.0   , 4.0  , kinf  ); //400-450
 468 //----------------------------------------------------------------
 469     SetCut(  5, 0.500, 0.976, 0.108, 1.484 , 0.159  , 3.5  , kinf  );  //450-500
 470     SetCut(  6, 0.550, 0.979, 0.108, 1.376 , 0.145  , 3.0  , kinf  );  //500-550
 471 //----------------------------------------------------------------
 472     SetCut(  7, 0.600, 0.984, 0.111, 1.295 , 0.146 , 2.7  , kinf  );   //550-600
 473     SetCut(  8, 0.650, 0.989, 0.113, 1.239 , 0.141 , 2.5  , kinf  );   //600-650
 474     SetCut(  9, 0.730, 0.995, 0.109, 1.172 , 0.132 , 2.0  , kinf  );   //650-730
 475 //----------------------------------------------------------------
 476     SetCut( 10, 0.830, 1.008, 0.116, 1.117 , 0.134 , 1.703, 0.209 ); //730-830
 477     SetCut( 11, 0.930, 1.019, 0.115, 1.072 , 0.121 , 1.535, 0.215 ); //830-930
 478     SetCut( 12, 1.230, 1.035, 0.117, 1.053 , 0.140  ,1.426, 0.270); //930-1030
 479     //------------------------ pi,K ---------------------
 480     faprob[0][0]=33219.;   faprob[1][0]=1971.;   // faprob[0][i] -    pions
 481     faprob[0][1]=28828.;   faprob[1][1]=1973.; // faprob[1][i] -    kaons
 482     //---------------------------------------------------
 483     faprob[0][2]=24532.;   faprob[1][2]=1932.; faprob[2][2]=1948.;
 484     faprob[0][3]=20797.;   faprob[1][3]=1823.; faprob[2][3]=1970.;
 485     faprob[0][4]=27017.;   faprob[1][4]=2681.; faprob[2][4]=2905.;
 486     //------------------------ pi,K,p -------------------
 487     faprob[0][5]= 24563.;    faprob[1][5]=2816.;  faprob[2][5]=3219.;
 488     faprob[0][6]= 16877.;    faprob[1][6]=2231.;  faprob[2][6]=2746.;
 489     faprob[0][7]= 11557.;    faprob[1][7]=1681;   faprob[2][7]=2190.;
 490
 491     fSilent=kTRUE;
 492 }
 493 //-----------------------------------------------------------
 494
 495
 496