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 "AliITSIOTrack.h"
  21 #include "Riostream.h"
  22 ClassImp(AliTPCPid)
  23 // Correction 13.01.2003 Z.S.,Dubna
  24 //            22.01.2003
  25 //------------------------------------------------------------
  26 Float_t AliTPCPid::qcorr(Float_t xc)
  27 {
  28     assert(0);
  29   Float_t fcorr;
  30   fcorr=( 0.766 +0.9692*xc -1.267*xc*xc )*( 1.-TMath::Exp(-xc*64.75) );
  31   if(fcorr<=0.1)fcorr=0.1;
  32 return qtot/fcorr;
  33 }
  34 //-----------------------------------------------------------
  35 Float_t AliTPCPid::qtrm(Int_t track)
  36 {
  37     TVector q(*( this->GetVec(track)  ));
  38     Int_t ml=(Int_t)q(0);
  39     if(ml<1)return 0.;
  40     if(ml>6)ml=6;
  41     float vf[6];
  42     Int_t nl=0; for(Int_t i=0;i<ml;i++){if(q(i)>fSigmin){vf[nl]=q(i+1);nl++;}}
  43     if(nl==0)return 0.;
  44     switch(nl){
  45       case  1:q(6)=q(1); break;
  46       case  2:q(6)=(q(1)+q(2))/2.; break;
  47       default:
  48         for(int fi=0;fi<2;fi++){
  49           Int_t swap;
  50           do{ swap=0; float qmin=vf[fi];
  51           for(int j=fi+1;j<nl;j++)
  52             if(qmin>vf[j]){qmin=vf[j];vf[j]=vf[fi];vf[fi]=qmin;swap=1;};
  53           }while(swap==1);
  54         }
  55         q(6)= (vf[0]+vf[1])/2.;
  56         break;
  57     }
  58     for(Int_t i=0;i<nl;i++){q(i+1)=vf[i];} this->SetVec(track,q);
  59     return (q(6));
  60 }// --- End AliTPCPid::qtrm ---
  61
  62 Float_t AliTPCPid::qtrm(Float_t qarr[6],Int_t narr)
  63 {
  64   //..................
  65   Float_t q[6],qm,qmin;
  66   Int_t nl,ml;
  67   if(narr>0&&narr<7){ml=narr;}else{return 0;};
  68   nl=0; for(Int_t i=0;i<ml;i++){if(qarr[i]>fSigmin){q[nl]=qarr[i];nl++;}}
  69   if(nl==0)return 0.;
  70     switch(nl){
  71       case  1:qm=q[0]; break;
  72       case  2:qm=(q[0]+q[1])/2.; break;
  73       default:
  74         Int_t swap;
  75         for(int fi=0;fi<2;fi++){
  76           do{ swap=0; qmin=q[fi];
  77           for(int j=fi+1;j<nl;j++)
  78             if(qmin>q[j]){qmin=q[j];q[j]=q[fi];q[fi]=qmin;swap=1;};
  79           }while(swap==1);
  80         }
  81         qm= (q[0]+q[1])/2.;
  82         break;
  83     }
  84     return qm;
  85 }// --- End AliTPCPid::qtrm  ---
  86
  87 Int_t   AliTPCPid::wpik(Int_t nc,Float_t q)
  88 {
  89     Float_t qmpi,qmk,sigpi,sigk,dpi,dk,ppi,pk;
  90     Float_t appi,apk;
  91     qmpi =cut[nc][1];
  92     sigpi=cut[nc][2];
  93     qmk  =cut[nc][3];
  94     sigk =cut[nc][4];
  95     appi = aprob[0][nc-5];
  96     apk  = aprob[1][nc-5];
  97     if( !fSilent ){
  98     cout<<"qmpi,sigpi,qmk,sigk="<<qmpi<<"  "<<sigpi<<"  "<<qmk<<"  "<<sigk<<endl;
  99     cout<<"appi,apk="<<appi<<","<<apk<<endl;
 100     }
 101     Float_t dqpi=(q-qmpi)/sigpi;
 102     Float_t dqk =(q-qmk )/sigk;
 103     dpi =TMath::Abs(dqpi);
 104     dk  =TMath::Abs(dqk);
 105     Double_t dn=appi*TMath::Gaus(q,qmpi,sigpi)+apk*TMath::Gaus(q,qmk,sigk);
 106     if(dn>0.){
 107       ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 108       pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 109     }else{fWpi=1;return pion();}
 110     Float_t rpik=ppi/(pk+0.0000001);
 111     if( !fSilent )
 112         cout<<"q,dqpi,dqk, wpik: ppi,pk,rpik="
 113         <<q<<"  "<<dqpi<<"  "<<dqk<<"  "<<ppi<<"  "<<pk<<"  "<<rpik<<endl;
 114
 115     fWp=0.; fWpi=ppi; fWk=pk;
 116     if( pk>ppi){return kaon();}else{return pion();}
 117 }
 118 //-----------------------------------------------------------
 119 //inline
 120 Int_t   AliTPCPid::wpikp(Int_t nc,Float_t q)
 121 {
 122    Float_t qmpi,qmk,qmp,sigpi,sigk,sigp,ppi,pk,pp;
 123    Float_t appi,apk,app;
 124
 125     qmpi =cut[nc][1];
 126     sigpi=cut[nc][2];
 127     qmk  =cut[nc][3];
 128     sigk =cut[nc][4];
 129     qmp  =cut[nc][5];
 130     sigp =cut[nc][6];
 131
 132     //appi = apk = app = 1.;
 133     appi = aprob[0][nc-5];
 134     apk  = aprob[1][nc-5];
 135     app  = aprob[2][nc-5];
 136
 137     Double_t dn= appi*TMath::Gaus(q,qmpi,sigpi)
 138       +apk*TMath::Gaus(q,qmk,sigk)+app*TMath::Gaus(q,qmp,sigp);
 139     if(dn>0.){
 140     ppi=appi*TMath::Gaus(q,qmpi,sigpi)/dn;
 141     pk = apk*TMath::Gaus(q,qmk, sigk )/dn;
 142     pp = app*TMath::Gaus(q,qmp, sigp )/dn;
 143      }
 144     else{fWpi=1;return pion();}
 145     fWp=pp; fWpi=ppi; fWk=pk;
 146     if( !fSilent ){
 147 cout<<" wpikp: mid,sig pi,k,p="<<qmpi<<" "<<sigpi<<";   "<<qmk<<" "<<sigk<<";   "
 148     <<qmp<<" "<<sigp<<"; "<<endl;
 149 cout<<" aprob: "<<appi<<"  "<<apk<<"  "<<app<<endl;
 150 cout<<" ppi,pk,pp="<<ppi<<"  "<<pk<<"  "<<pp<<endl;
 151      }
 152     if( ppi>pk&&ppi>pp )  { return pion(); }
 153     if(pk>pp){return kaon();}else{return proton();}
 154 }
 155 //-----------------------------------------------------------
 156 Int_t   AliTPCPid::GetPcode(TClonesArray* rps,Float_t pm)
 157 {
 158     return 0;
 159 }
 160 //-----------------------------------------------------------
 161 Int_t   AliTPCPid::GetPcode(AliTPCtrack *track)
 162 {
 163       Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 164       Float_t phi=TMath::ASin(par[2]) + track->GetAlpha();
 165       if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
 166       if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
 167       Float_t lam=TMath::ATan(par[3]);
 168       Float_t pt_1=TMath::Abs(par[4]);
 169       Float_t mom=1./(pt_1*TMath::Cos(lam));
 170       Float_t dedx=track->GetdEdx();
 171     Int_t pcode=GetPcode(dedx/40.,mom);
 172     cout<<"TPCtrack dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 173     return pcode?pcode:211;
 174     }
 175 //-----------------------------------------------------------
 176 Int_t   AliTPCPid::GetPcode(AliITStrackV2 *track)
 177 {
 178   if(track==0)return 0;
 179   //      track->Propagate(track->GetAlpha(),3.,0.1/65.19*1.848,0.1*1.848);
 180       track->PropagateTo(3.,0.0028,65.19);
 181       track->PropagateToVertex();
 182     Double_t xk,par[5]; track->GetExternalParameters(xk,par);
 183     Float_t lam=TMath::ATan(par[3]);
 184     Float_t pt_1=TMath::Abs(par[4]);
 185     Float_t mom=0.;
 186     if( (pt_1*TMath::Cos(lam))!=0. ){ mom=1./(pt_1*TMath::Cos(lam)); }else{mom=0.;};
 187     Float_t dedx=track->GetdEdx();
 188     cout<<"lam,pt_1,mom,dedx="<<lam<<","<<pt_1<<","<<mom<<","<<dedx<<endl;
 189     Int_t pcode=GetPcode(dedx,mom);
 190     cout<<"ITS V2 dedx,mom,pcode="<<dedx<<","<<mom<<","<<pcode<<endl;
 191 return pcode?pcode:211;
 192 }
 193 //-----------------------------------------------------------
 194 Int_t   AliTPCPid::GetPcode(Float_t q,Float_t pm)
 195 {
 196     fWpi=fWk=fWp=0.;     fPcode=0;
 197 //1)---------------------- 0-120 MeV/c --------------
 198     if ( pm<=cut[1][0] )
 199         { fWpi=1.; return pion(); }
 200 //2)----------------------120-200 Mev/c ( 29.7.2002 ) -------------
 201     if ( pm<=cut[2][0] )
 202         { if( q<fCutKa->Eval(pm) ){fWpi=1.; return pion(); }
 203                              else {fWk =1.; return  kaon();} }
 204 //3)----------------------200-400 Mev/c -------------
 205     if ( pm<=cut[3][0] )
 206         if( q<fCutKa->Eval(pm) )
 207                 { fWpi=1.;return pion(); }
 208              else
 209                 { if ( q<=fCutPr->Eval(pm) )
 210                              {fWk=1.;return kaon();}
 211                         else {fWp=1.;return proton();}
 212                 }
 213 //4)----------------------400-450 Mev/c -------------
 214     if ( pm<=cut[4][0] )
 215         if( q<fCutKaTune*fCutKa->Eval(pm) )
 216                 { fWpi=1.;return pion(); }
 217             else
 218                 { if( q<fCutPr->Eval(pm) )
 219                   {fWk=1.;return kaon();} else {fWp=1.;return proton(); }
 220                 }
 221 //5)----------------------450-500 Mev/c -------------
 222     if ( pm<=cut[5][0] )
 223         if ( q>fCutPr->Eval(pm) )
 224            {fWp=1.;return proton();} else {return wpik(5,q);};
 225 //6)----------------------500-550 Mev/c -------------
 226     if ( pm<=cut[6][0] )
 227         if ( q>fCutPr->Eval(pm) )
 228            {fWp=1.;return proton();} else {return wpik(6,q);};
 229 //7)----------------------550-600 Mev/c -------------
 230     if ( pm<=cut[7][0] )
 231         if ( q>fCutPr->Eval(pm) )
 232            {fWp=1.;return proton();} else {return wpik(7,q);};
 233 //8)----------------------600-650 Mev/c -------------
 234     if ( pm<=cut[8][0] )
 235       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return proton();}
 236                                      else {return wpik(8,q);};
 237 //9)----------------------650-730 Mev/c -------------
 238     if ( pm<=cut[9][0] )
 239       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return proton();}
 240                                      else {return wpik(9,q);};
 241 //10)----------------------730-830 Mev/c -------------
 242     if( pm<=cut[10][0] )
 243       if ( q>fCutPrTune*fCutPr->Eval(pm) ){fWp=1.;return proton();}
 244                                      else {return wpik(10,q);};
 245 //11)----------------------830-930 Mev/c -------------
 246     if( pm<=cut[11][0] ){ return wpikp(11,q); }
 247 //12)----------------------930-1030 Mev/c -------------
 248     if( pm<=cut[12][0] )
 249      { return wpikp(12,q); };
 250
 251     return fPcode;
 252 }
 253 //-----------------------------------------------------------
 254 void    AliTPCPid::SetCut(Int_t n,Float_t pm,Float_t pilo,Float_t pihi,
 255                         Float_t klo,Float_t khi,Float_t plo,Float_t phi)
 256 {
 257     cut[n][0]=pm;
 258     cut[n][1]=pilo;
 259     cut[n][2]=pihi;
 260     cut[n][3]=klo;
 261     cut[n][4]=khi;
 262     cut[n][5]=plo;
 263     cut[n][6]=phi;
 264     return ;
 265 }
 266 //------------------------------------------------------------
 267 void AliTPCPid::SetVec(Int_t ntrack,TVector info)
 268 {
 269 TClonesArray& arr=*trs;
 270     new( arr[ntrack] ) TVector(info);
 271 }
 272 //-----------------------------------------------------------
 273 TVector* AliTPCPid::GetVec(Int_t ntrack)
 274 {
 275 TClonesArray& arr=*trs;
 276     return (TVector*)arr[ntrack];
 277 }
 278 //-----------------------------------------------------------
 279 void AliTPCPid::SetEdep(Int_t track,Float_t Edep)
 280 {
 281     TVector xx(0,11);
 282     if( ((TVector*)trs->At(track))->IsValid() )
 283         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 284     Int_t j=(Int_t)xx(0); if(j>4)return;
 285     xx(++j)=Edep;xx(0)=j;
 286     TClonesArray &arr=*trs;
 287     new(arr[track])TVector(xx);
 288 }
 289 //-----------------------------------------------------------
 290 void AliTPCPid::SetPmom(Int_t track,Float_t Pmom)
 291 {
 292     TVector xx(0,11);
 293     if( ((TVector*)trs->At(track))->IsValid() )
 294         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 295     xx(10)=Pmom;
 296     TClonesArray &arr=*trs;
 297     new(arr[track])TVector(xx);
 298 }
 299 //-----------------------------------------------------------
 300 void AliTPCPid::SetPcod(Int_t track,Int_t partcode)
 301 {
 302     TVector xx(0,11);
 303     if( ((TVector*)trs->At(track))->IsValid() )
 304         {TVector yy( *((TVector*)trs->At(track)) );xx=yy; }
 305     if(xx(11)==0)
 306         {xx(11)=partcode; mxtrs++;
 307         TClonesArray &arr=*trs;
 308         new(arr[track])TVector(xx);
 309         }
 310 }
 311 //-----------------------------------------------------------
 312 void AliTPCPid::Print(Int_t track)
 313 {cout<<mxtrs<<" tracks in AliITSPid obj."<<endl;
 314     if( ((TVector*)trs->At(track))->IsValid() )
 315         {TVector xx( *((TVector*)trs->At(track)) );
 316          xx.Print();
 317          }
 318     else
 319         {cout<<"No data for track "<<track<<endl;return;}
 320 }
 321 //-----------------------------------------------------------
 322 void AliTPCPid::Tab(void)
 323 {
 324 if(trs->GetEntries()==0){cout<<"No entries in TAB"<<endl;return;}
 325 cout<<"------------------------------------------------------------------------"<<endl;
 326 cout<<"Nq"<<"   q1  "<<"   q2  "<<"   q3  "<<"   q4  "<<"   q5   "<<
 327       " Qtrm    "    <<"  Wpi  "<<"  Wk   "<<"  Wp  "<<"Pmom  "<<endl;
 328 cout<<"------------------------------------------------------------------------"<<endl;
 329 for(Int_t i=0;i<trs->GetEntries();i++)
 330 {
 331   TVector xx( *((TVector*)trs->At(i)) );
 332     if( xx.IsValid() && xx(0)>0 )
 333         {
 334             TVector xx( *((TVector*)trs->At(i)) );
 335             if(xx(0)>=2)
 336                 {
 337 //       1)Calculate Qtrm
 338                     xx(6)=(this->qtrm(i));
 339
 340                  }else{
 341                      xx(6)=xx(1);
 342                  }
 343 //       2)Calculate Wpi,Wk,Wp
 344             this->GetPcode(xx(6),xx(10)/1000.);
 345             xx(7)=GetWpi();
 346             xx(8)=GetWk();
 347             xx(9)=GetWp();
 348 //       3)Print table
 349             if(xx(0)>0){
 350                     cout<<xx(0)<<" ";
 351                     for(Int_t j=1;j<11;j++){
 352                         cout.width(7);cout.precision(5);cout<<xx(j);
 353                     }
 354                     cout<<endl;
 355                 }
 356 //        4)Update data in TVector
 357             TClonesArray &arr=*trs;
 358             new(arr[i])TVector(xx);
 359         }
 360     else
 361       {/*cout<<"No data for track "<<i<<endl;*/}
 362 }// End loop for tracks
 363 }
 364 void AliTPCPid::Reset(void)
 365 {
 366   for(Int_t i=0;i<trs->GetEntries();i++){
 367     TVector xx(0,11);
 368     TClonesArray &arr=*trs;
 369     new(arr[i])TVector(xx);
 370   }
 371 }
 372 //-----------------------------------------------------------
 373 AliTPCPid::AliTPCPid(Int_t ntrack)
 374 {
 375     trs = new TClonesArray("TVector",ntrack);
 376     TClonesArray &arr=*trs;
 377     for(Int_t i=0;i<ntrack;i++)new(arr[i])TVector(0,11);
 378     mxtrs=0;
 379
 380     //fCutKa = new TF1("fkaons","[0]/x/x+[1]",0.1,1.2);
 381     //fCutPr = new TF1("fprotons","[0]/x/x +[1]",0.2,1.2);
 382     TF1 *f_rmska = new TF1("x_frmska","1.46-7.82*x+16.78*x^2-15.53*x^3+5.24*x^4 ",
 383                 0.1,1.2);
 384     fCutKa = new TF1("fkaons",
 385            "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",
 386            0.1,1.2);
 387     fCutPr = new TF1("fprotons",
 388                      "0.83*(15.32-56.094*x+89.962*x^2-66.1856*x^3+18.4052*x^4)",
 389                      0.2,1.2);
 390     fCutKaTune=1.1; // 0.92;
 391     fCutPrTune=1.0; //0.80;
 392
 393 const int inf=10;
 394 //         Ncut Pmom   pilo  pihi    klo    khi     plo    phi
 395 //       cut[j] [0]    [1]    [2]    [3]    [4]     [5]    [6]
 396 //----------------------------------------------------------------
 397     SetCut(  1, 0.120,  0.  ,  0.  , inf  , inf   , inf  , inf  );
 398     SetCut(  2, 0.200,  0.  ,  6.0 , 6.0  , inf   , inf  , inf  ); //120-200
 399     SetCut(  3, 0.400,  0.  ,  3.5 , 3.5  , 9.0   , 9.0  , inf  ); //200-400
 400     SetCut(  4, 0.450,  0.  ,  1.9 , 1.9  , 4.0   , 4.0  , inf  ); //400-450
 401 //----------------------------------------------------------------
 402     SetCut(  5, 0.500, 0.976, 0.108, 1.484 , 0.159  , 3.5  , inf  );  //450-500
 403     SetCut(  6, 0.550, 0.979, 0.108, 1.376 , 0.145  , 3.0  , inf  );  //500-550
 404 //----------------------------------------------------------------
 405     SetCut(  7, 0.600, 0.984, 0.111, 1.295 , 0.146 , 2.7  , inf  );   //550-600
 406     SetCut(  8, 0.650, 0.989, 0.113, 1.239 , 0.141 , 2.5  , inf  );   //600-650
 407     SetCut(  9, 0.730, 0.995, 0.109, 1.172 , 0.132 , 2.0  , inf  );   //650-730
 408 //----------------------------------------------------------------
 409     SetCut( 10, 0.830, 1.008, 0.116, 1.117 , 0.134 , 1.703, 0.209 ); //730-830
 410     SetCut( 11, 0.930, 1.019, 0.115, 1.072 , 0.121 , 1.535, 0.215 ); //830-930
 411     SetCut( 12, 1.230, 1.035, 0.117, 1.053 , 0.140  ,1.426, 0.270); //930-1030
 412     //------------------------ pi,K ---------------------
 413     aprob[0][0]=33219.;   aprob[1][0]=1971.;   // aprob[0][i] -    pions
 414     aprob[0][1]=28828.;   aprob[1][1]=1973.; // aprob[1][i] -    kaons
 415     //---------------------------------------------------
 416     aprob[0][2]=24532.;   aprob[1][2]=1932.; aprob[2][2]=1948.;
 417     aprob[0][3]=20797.;   aprob[1][3]=1823.; aprob[2][3]=1970.;
 418     aprob[0][4]=27017.;   aprob[1][4]=2681.; aprob[2][4]=2905.;
 419     //------------------------ pi,K,p -------------------
 420     aprob[0][5]= 24563.;    aprob[1][5]=2816.;  aprob[2][5]=3219.;
 421     aprob[0][6]= 16877.;    aprob[1][6]=2231.;  aprob[2][6]=2746.;
 422     aprob[0][7]= 11557.;    aprob[1][7]=1681;   aprob[2][7]=2190.;
 423
 424     fSilent=kTRUE;
 425 }
 426 //-----------------------------------------------------------
 427
 428
 429