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 "Riostream.h"
  25 ClassImp(AliTPCPid)
  26 // Correction 13.01.2003 Z.S.,Dubna
  27 //            22.01.2003
  28 //------------------------------------------------------------
  29 // pid class by B. Batyunya
  30 // stupid corrections by M.K.
  31 //
  32 //________________________________________________________
  33   AliTPCPid::AliTPCPid( const AliTPCPid& r):TObject(r)
  34 {
  35   // dummy copy constructor
  36 }
  37 Float_t AliTPCPid::Qcorr(Float_t xc)
  38 {
  39   //
  40   // charge correction
  41   //
  42     assert(0);
  43   Float_t fcorr;
  44   fcorr=( 0.766 +0.9692*xc -1.267*xc*xc )*( 1.-TMath::Exp(-xc*64.75) );
  45   if(fcorr<=0.1)fcorr=0.1;
  46 return fqtot/fcorr;
  47 }
  48 //-----------------------------------------------------------
  49 Float_t AliTPCPid::Qtrm(Int_t track) const
  50 {
  51   //
  52   // dummy comment (Boris!!!)
  53   //
  54     TVector q(*( this->GetVec(track)  ));
  55     Int_t ml=(Int_t)q(0);
  56     if(ml<1)return 0.;
  57     if(ml>6)ml=6;
  58     float vf[6];
  59     Int_t nl=0; for(Int_t i=0;i<ml;i++){if(q(i)>fSigmin){vf[nl]=q(i+1);nl++;}}
  60     if(nl==0)return 0.;
  61     switch(nl){
  62       case  1:q(6)=q(1); break;
  63       case  2:q(6)=(q(1)+q(2))/2.; break;
  64       default:
  65         for(int fi=0;fi<2;fi++){
  66           Int_t swap;
  67           do{ swap=0; float qmin=vf[fi];
  68           for(int j=fi+1;j<nl;j++)
  69             if(qmin>vf[j]){qmin=vf[j];vf[j]=vf[fi];vf[fi]=qmin;swap=1;};
  70           }while(swap==1);
  71         }
  72         q(6)= (vf[0]+vf[1])/2.;
  73         break;
  74     }
  75     for(Int_t i=0;i<nl;i++){q(i+1)=vf[i];} this->SetVec(track,q);
  76     return (q(6));
  77 }// --- End AliTPCPid::Qtrm ---
  78
  79 Float_t AliTPCPid::Qtrm(Float_t qarr[6],Int_t narr)
  80 {
  81   //..................
  82   Float_t q[6],qm,qmin;
  83   Int_t nl,ml;
  84   if(narr>0&&narr<7){ml=narr;}else{return 0;};
  85   nl=0; for(Int_t i=0;i<ml;i++){if(qarr[i]>fSigmin){q[nl]=qarr[i];nl++;}}
  86   if(nl==0)return 0.;
  87     switch(nl){
  88       case  1:qm=q[0]; break;
  89       case  2:qm=(q[0]+q[1])/2.; break;
  90       default:
  91         Int_t swap;
  92         for(int fi=0;fi<2;fi++){
  93           do{ swap=0; qmin=q[fi];
  94           for(int j=fi+1;j<nl;j++)
  95             if(qmin>q[j]){qmin=q[j];q[j]=q[fi];q[fi]=qmin;swap=1;};
  96           }while(swap==1);
  97         }
  98         qm= (q[0]+q[1])/2.;
  99         break;
 100     }
 101     return qm;
 102 }// --- End AliTPCPid::Qtrm  ---
 103
 104 Int_t   AliTPCPid::Wpik(Int_t nc,Float_t q)
 105 {
 106   //
 107   //  pi-k
 108   //
 109     Float_t qmpi,qmk,sigpi,sigk,dpi,dk,ppi,pk;
 110     Float_t appi,apk;
 111     qmpi =fcut[nc][1];
 112     sigpi=fcut[nc][2];
 113     qmk  =fcut[nc][3];
 114     sigk =fcut[nc][4];
 115     appi = faprob[0][nc-5];
 116     apk  = faprob[1][nc-5];
 117     if( !fSilent ){
 118     cout<<"qmpi,sigpi,qmk,sigk="<<qmpi<<"  "<<sigpi<<"  "<<qmk<<"  "<<sigk<<endl;
 119     cout<<"appi,apk="<<appi<<","<<apk<<endl;
 120     }
 121     Float_t dqpi=(q-qmpi)/sigpi;
 122     Float_t dqk =(q-qmk )/sigk;
 123     dpi =TMath::Abs(dqpi);
 124     dk  =TMath::Abs(dqk);
 125     Double_t dn=appi*TMath::Gaus(q,qmpi,sigpi)+apk*TMath::Gaus(q,qmk,sigk);
 126     if(dn>0.){
 127       ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 128       pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 129     }else{fWpi=1;return Pion();}
 130     Float_t rpik=ppi/(pk+0.0000001);
 131     if( !fSilent )
 132         cout<<"q,dqpi,dqk, Wpik: ppi,pk,rpik="
 133         <<q<<"  "<<dqpi<<"  "<<dqk<<"  "<<ppi<<"  "<<pk<<"  "<<rpik<<endl;
 134
 135     fWp=0.; fWpi=ppi; fWk=pk;
 136     if( pk>ppi){return Kaon();}else{return Pion();}
 137 }
 138 //-----------------------------------------------------------
 139 Int_t   AliTPCPid::Wpikp(Int_t nc,Float_t q)
 140 {
 141   //
 142   // pi-k-p
 143   //
 144    Float_t qmpi,qmk,qmp,sigpi,sigk,sigp,ppi,pk,pp;
 145    Float_t appi,apk,app;
 146
 147     qmpi =fcut[nc][1];
 148     sigpi=fcut[nc][2];
 149     qmk  =fcut[nc][3];
 150     sigk =fcut[nc][4];
 151     qmp  =fcut[nc][5];
 152     sigp =fcut[nc][6];
 153
 154     //appi = apk = app = 1.;
 155     appi = faprob[0][nc-5];
 156     apk  = faprob[1][nc-5];
 157     app  = faprob[2][nc-5];
 158
 159     Double_t dn= appi*TMath::Gaus(q,qmpi,sigpi)
 160       +apk*TMath::Gaus(q,qmk,sigk)+app*TMath::Gaus(q,qmp,sigp);
 161     if(dn>0.){
 162     ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 163     pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 164     pp = app*TMath::Gaus(q,qmp, sigp )/dn;
 165      }
 166     else{fWpi=1;return Pion();}
 167     fWp=pp; fWpi=ppi; fWk=pk;
 168     if( !fSilent ){
 169 cout<<" Wpikp: mid,sig pi,k,p="<<qmpi<<" "<<sigpi<<";   "<<qmk<<" "<<sigk<<";   "
 170     <<qmp<<" "<<sigp<<"; "<<endl;
 171 cout<<" faprob: "<<appi<<"  "<<apk<<"  "<<app<<endl;
 172 cout<<" ppi,pk,pp="<<ppi<<"  "<<pk<<"  "<<pp<<endl;
 173      }
 174     if( ppi>pk&&ppi>pp )  { return Pion(); }
 175     if(pk>pp){return Kaon();}else{return Proton();}
 176 }
 177 //-----------------------------------------------------------
 178 Int_t   AliTPCPid::GetPcode(TClonesArray* /*rps*/,Float_t /*pm*/) const
 179 {
 180   //
 181   // dummy ???
 182   //
 183     return 0;
 184 }
 185 //-----------------------------------------------------------
 186 Int_t   AliTPCPid::GetPcode(AliTPCtrack *track)
 187 {
 188   //
 189   // get particle code
 190   //
 191       Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 192       Float_t phi=TMath::ASin(par[2]) + track->GetAlpha();
 193       if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
 194       if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
 195       Float_t lam=TMath::ATan(par[3]);
 196       Float_t pt1=TMath::Abs(par[4]);
 197       Float_t mom=1./(pt1*TMath::Cos(lam));
 198       Float_t dedx=track->GetdEdx();
 199     Int_t pcode=GetPcode(dedx/40.,mom);
 200     cout<<"TPCtrack dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 201     return pcode?pcode:211;
 202     }
 203 //-----------------------------------------------------------
 204 Int_t   AliTPCPid::GetPcode(AliITStrackV2 *track)
 205 {
 206   //
 207   // get particle code
 208   //
 209   if(track==0)return 0;
 210   //      track->Propagate(track->GetAlpha(),3.,0.1/65.19*1.848,0.1*1.848);
 211       track->PropagateTo(3.,0.0028,65.19);
 212       track->PropagateToVertex();
 213     Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 214     Float_t lam=TMath::ATan(par[3]);
 215     Float_t pt1=TMath::Abs(par[4]);
 216     Float_t mom=0.;
 217     if( (pt1*TMath::Cos(lam))!=0. ){ mom=1./(pt1*TMath::Cos(lam)); }else{mom=0.;};
 218     Float_t dedx=track->GetdEdx();
 219     cout<<"lam,pt1,mom,dedx="<<lam<<","<<pt1<<","<<mom<<","<<dedx<<endl;
 220     Int_t pcode=GetPcode(dedx,mom);
 221     cout<<"ITS V2 dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 222 return pcode?pcode:211;
 223 }
 224 //-----------------------------------------------------------
 225 Int_t   AliTPCPid::GetPcode(Float_t q,Float_t pm)
 226 {
 227   //
 228   // get particle code
 229   //
 230     fWpi=fWk=fWp=0.;     fPcode=0;
 231 //1)---------------------- 0-120 MeV/c --------------
 232     if ( pm<=fcut[1][0] )
 233         { fWpi=1.; return Pion(); }
 234 //2)----------------------120-200 Mev/c ( 29.7.2002 ) -------------
 235     if ( pm<=fcut[2][0] )
 236         { if( q<fCutKa->Eval(pm) ){fWpi=1.; return Pion(); }
 237                              else {fWk =1.; return  Kaon();} }
 238 //3)----------------------200-400 Mev/c -------------
 239     if ( pm<=fcut[3][0] )
 240         if( q<fCutKa->Eval(pm) )
 241                 { fWpi=1.;return Pion(); }
 242              else
 243                 { if ( q<=fCutPr->Eval(pm) )
 244                              {fWk=1.;return Kaon();}
 245                         else {fWp=1.;return Proton();}
 246                 }
 247 //4)----------------------400-450 Mev/c -------------
 248     if ( pm<=fcut[4][0] )
 249         if( q<fCutKaTune*fCutKa->Eval(pm) )
 250                 { fWpi=1.;return Pion(); }
 251             else
 252                 { if( q<fCutPr->Eval(pm) )
 253                   {fWk=1.;return Kaon();} else {fWp=1.;return Proton(); }
 254                 }
 255 //5)----------------------450-500 Mev/c -------------
 256     if ( pm<=fcut[5][0] )
 257         if ( q>fCutPr->Eval(pm) )
 258            {fWp=1.;return Proton();} else {return Wpik(5,q);};
 259 //6)----------------------500-550 Mev/c -------------
 260     if ( pm<=fcut[6][0] )
 261         if ( q>fCutPr->Eval(pm) )
 262            {fWp=1.;return Proton();} else {return Wpik(6,q);};
 263 //7)----------------------550-600 Mev/c -------------
 264     if ( pm<=fcut[7][0] )
 265         if ( q>fCutPr->Eval(pm) )
 266            {fWp=1.;return Proton();} else {return Wpik(7,q);};
 267 //8)----------------------600-650 Mev/c -------------
 268     if ( pm<=fcut[8][0] )
 269       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 270                                      else {return Wpik(8,q);};
 271 //9)----------------------650-730 Mev/c -------------
 272     if ( pm<=fcut[9][0] )
 273       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 274                                      else {return Wpik(9,q);};
 275 //10)----------------------730-830 Mev/c -------------
 276     if( pm<=fcut[10][0] )
 277       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return Proton();}
 278                                      else {return Wpik(10,q);};
 279 //11)----------------------830-930 Mev/c -------------
 280     if( pm<=fcut[11][0] ){ return Wpikp(11,q); }
 281 //12)----------------------930-1030 Mev/c -------------
 282     if( pm<=fcut[12][0] )
 283      { return Wpikp(12,q); };
 284
 285     return fPcode;
 286 }
 287 //-----------------------------------------------------------
 288 void    AliTPCPid::SetCut(Int_t n,Float_t pm,Float_t pilo,Float_t pihi,
 289                         Float_t klo,Float_t khi,Float_t plo,Float_t phi)
 290 {
 291   //
 292   // set cuts
 293   //
 294     fcut[n][0]=pm;
 295     fcut[n][1]=pilo;
 296     fcut[n][2]=pihi;
 297     fcut[n][3]=klo;
 298     fcut[n][4]=khi;
 299     fcut[n][5]=plo;
 300     fcut[n][6]=phi;
 301     return ;
 302 }
 303 //------------------------------------------------------------
 304 void AliTPCPid::SetVec(Int_t ntrack,TVector info) const
 305 {
 306   //
 307   // new track vector
 308   //
 309 TClonesArray& arr=*trs;
 310     new( arr[ntrack] ) TVector(info);
 311 }
 312 //-----------------------------------------------------------
 313 TVector* AliTPCPid::GetVec(Int_t ntrack) const
 314 {
 315   //
 316   // get track vector
 317   //
 318 TClonesArray& arr=*trs;
 319     return (TVector*)arr[ntrack];
 320 }
 321 //-----------------------------------------------------------
 322 void AliTPCPid::SetEdep(Int_t track,Float_t Edep)
 323 {
 324   //
 325   // energy deposit
 326   //
 327     TVector xx(0,11);
 328     if( ((TVector*)trs->At(track))->IsValid() )
 329         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 330     Int_t j=(Int_t)xx(0); if(j>4)return;
 331     xx(++j)=Edep;xx(0)=j;
 332     TClonesArray &arr=*trs;
 333     new(arr[track])TVector(xx);
 334 }
 335 //-----------------------------------------------------------
 336 void AliTPCPid::SetPmom(Int_t track,Float_t Pmom)
 337 {
 338   //
 339   // set part. momentum
 340   //
 341     TVector xx(0,11);
 342     if( ((TVector*)trs->At(track))->IsValid() )
 343         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 344     xx(10)=Pmom;
 345     TClonesArray &arr=*trs;
 346     new(arr[track])TVector(xx);
 347 }
 348 //-----------------------------------------------------------
 349 void AliTPCPid::SetPcod(Int_t track,Int_t partcode)
 350 {
 351   //
 352   // set part. code
 353   //
 354     TVector xx(0,11);
 355     if( ((TVector*)trs->At(track))->IsValid() )
 356         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 357     if(xx(11)==0)
 358         {xx(11)=partcode; fmxtrs++;
 359         TClonesArray &arr=*trs;
 360         new(arr[track])TVector(xx);
 361         }
 362 }
 363 //-----------------------------------------------------------
 364 void AliTPCPid::Print(Int_t track)
 365 {
 366   //
 367   // control print
 368   //
 369 cout<<fmxtrs<<" tracks in AliITSPid obj."<<endl;
 370     if( ((TVector*)trs->At(track))->IsValid() )
 371         {TVector xx( *((TVector*)trs->At(track)) );
 372          xx.Print();
 373          }
 374     else
 375         {cout<<"No data for track "<<track<<endl;return;}
 376 }
 377 //-----------------------------------------------------------
 378 void AliTPCPid::Tab(void)
 379 {
 380   //
 381   // fill table
 382   //
 383 if(trs->GetEntries()==0){cout<<"No entries in TAB"<<endl;return;}
 384 cout<<"------------------------------------------------------------------------"<<endl;
 385 cout<<"Nq"<<"   q1  "<<"   q2  "<<"   q3  "<<"   q4  "<<"   q5   "<<
 386       " Qtrm    "    <<"  Wpi  "<<"  Wk   "<<"  Wp  "<<"Pmom  "<<endl;
 387 cout<<"------------------------------------------------------------------------"<<endl;
 388 for(Int_t i=0;i<trs->GetEntries();i++)
 389 {
 390   TVector xx( *((TVector*)trs->At(i)) );
 391     if( xx.IsValid() && xx(0)>0 )
 392         {
 393             TVector xx( *((TVector*)trs->At(i)) );
 394             if(xx(0)>=2)
 395                 {
 396 //       1)Calculate Qtrm
 397                     xx(6)=(this->Qtrm(i));
 398
 399                  }else{
 400                      xx(6)=xx(1);
 401                  }
 402 //       2)Calculate Wpi,Wk,Wp
 403             this->GetPcode(xx(6),xx(10)/1000.);
 404             xx(7)=GetWpi();
 405             xx(8)=GetWk();
 406             xx(9)=GetWp();
 407 //       3)Print table
 408             if(xx(0)>0){
 409                     cout<<xx(0)<<" ";
 410                     for(Int_t j=1;j<11;j++){
 411                         cout.width(7);cout.precision(5);cout<<xx(j);
 412                     }
 413                     cout<<endl;
 414                 }
 415 //        4)Update data in TVector
 416             TClonesArray &arr=*trs;
 417             new(arr[i])TVector(xx);
 418         }
 419     else
 420       {/*cout<<"No data for track "<<i<<endl;*/}
 421 }// End loop for tracks
 422 }
 423 void AliTPCPid::Reset(void)
 424 {
 425   //
 426   // reset
 427   //
 428   for(Int_t i=0;i<trs->GetEntries();i++){
 429     TVector xx(0,11);
 430     TClonesArray &arr=*trs;
 431     new(arr[i])TVector(xx);
 432   }
 433 }
 434 //-----------------------------------------------------------
 435 AliTPCPid::AliTPCPid(Int_t ntrack)
 436 {
 437     trs = new TClonesArray("TVector",ntrack);
 438     TClonesArray &arr=*trs;
 439     for(Int_t i=0;i<ntrack;i++)new(arr[i])TVector(0,11);
 440     fmxtrs=0;
 441
 442     //fCutKa = new TF1("fkaons","[0]/x/x+[1]",0.1,1.2);
 443     //fCutPr = new TF1("fprotons","[0]/x/x +[1]",0.2,1.2);
 444     TF1 *frmska=0;
 445
 446     frmska = new TF1("x_frmska","1.46-7.82*x+16.78*x^2-15.53*x^3+5.24*x^4 ",
 447                 0.1,1.2);
 448     fCutKa = new TF1("fkaons",
 449            "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",
 450            0.1,1.2);
 451     fCutPr = new TF1("fprotons",
 452                      "0.83*(15.32-56.094*x+89.962*x^2-66.1856*x^3+18.4052*x^4)",
 453                      0.2,1.2);
 454     fCutKaTune=1.1; // 0.92;
 455     fCutPrTune=1.0; //0.80;
 456
 457 const int kinf=10;
 458 //         Ncut Pmom   pilo  pihi    klo    khi     plo    phi
 459 //       fcut[j] [0]    [1]    [2]    [3]    [4]     [5]    [6]
 460 //----------------------------------------------------------------
 461     SetCut(  1, 0.120,  0.  ,  0.  , kinf  , kinf   , kinf  , kinf  );
 462     SetCut(  2, 0.200,  0.  ,  6.0 , 6.0  , kinf   , kinf  , kinf  ); //120-200
 463     SetCut(  3, 0.400,  0.  ,  3.5 , 3.5  , 9.0   , 9.0  , kinf  ); //200-400
 464     SetCut(  4, 0.450,  0.  ,  1.9 , 1.9  , 4.0   , 4.0  , kinf  ); //400-450
 465 //----------------------------------------------------------------
 466     SetCut(  5, 0.500, 0.976, 0.108, 1.484 , 0.159  , 3.5  , kinf  );  //450-500
 467     SetCut(  6, 0.550, 0.979, 0.108, 1.376 , 0.145  , 3.0  , kinf  );  //500-550
 468 //----------------------------------------------------------------
 469     SetCut(  7, 0.600, 0.984, 0.111, 1.295 , 0.146 , 2.7  , kinf  );   //550-600
 470     SetCut(  8, 0.650, 0.989, 0.113, 1.239 , 0.141 , 2.5  , kinf  );   //600-650
 471     SetCut(  9, 0.730, 0.995, 0.109, 1.172 , 0.132 , 2.0  , kinf  );   //650-730
 472 //----------------------------------------------------------------
 473     SetCut( 10, 0.830, 1.008, 0.116, 1.117 , 0.134 , 1.703, 0.209 ); //730-830
 474     SetCut( 11, 0.930, 1.019, 0.115, 1.072 , 0.121 , 1.535, 0.215 ); //830-930
 475     SetCut( 12, 1.230, 1.035, 0.117, 1.053 , 0.140  ,1.426, 0.270); //930-1030
 476     //------------------------ pi,K ---------------------
 477     faprob[0][0]=33219.;   faprob[1][0]=1971.;   // faprob[0][i] -    pions
 478     faprob[0][1]=28828.;   faprob[1][1]=1973.; // faprob[1][i] -    kaons
 479     //---------------------------------------------------
 480     faprob[0][2]=24532.;   faprob[1][2]=1932.; faprob[2][2]=1948.;
 481     faprob[0][3]=20797.;   faprob[1][3]=1823.; faprob[2][3]=1970.;
 482     faprob[0][4]=27017.;   faprob[1][4]=2681.; faprob[2][4]=2905.;
 483     //------------------------ pi,K,p -------------------
 484     faprob[0][5]= 24563.;    faprob[1][5]=2816.;  faprob[2][5]=3219.;
 485     faprob[0][6]= 16877.;    faprob[1][6]=2231.;  faprob[2][6]=2746.;
 486     faprob[0][7]= 11557.;    faprob[1][7]=1681;   faprob[2][7]=2190.;
 487
 488     fSilent=kTRUE;
 489 }
 490 //-----------------------------------------------------------
 491
 492
 493