goal : simulation of single hypertriton for run 11.

Decay : 3H → pdπ

some details :

• it is defined by pid = 62053

Particle hyperTriton_d_p_pi_minus code      = 62053            ,
                                  mass      = 2.99131          ,
                                  charge    = -1               ,
                                  tlife     = 2.6320e-10       ,
                                  pdg       = UNDEFINED        ,
                                  trktyp    = kGtHADR          ,
                                  bratio    = {1,}             ,
                                  mode      = {091445,}

• single 3H (1 per event) are simulated with
  • flat 0.1 < P_t < 5 GeV/c
  • flat in 0 < azimuth < 2π
  • flat in pseudorapidity |η|<1
  • primary vertex with σ_z = 75 cm σ_xy = 5cm ( 1st test) 
• simulation is done with y2011 geometry and the following BFC chain :

root4star -b -q 'bfc.C('$1','$2',"tpcRS,y2011,MakeEvent,ITTF,NoSsdIt,NoSvtIt,Idst,BAna,l0,ftpc,pmd,Tree,logger,

Sti,VFMCE,tpcDB,TpcHitMover,TpxClu,bbcSim,btofsim,tags,emcY2,EEfs,evout,-dstout,IdTruth,geantout,big,fzin,MiniM

cMk,clearmem","test2.fz")'

minimc files analysis :

• loop over matchedPairs branch
• make triplets w/o any cut
• fill NTuple

Cuts are applied in the NTuple :

1. cut0 =""; (means no cut)
2. cut[1] = " geantId_trk1==9 && geantId_trk2==14 && geantId_trk3==45"; (means selection of good tracks)
3. cut[2] = " geantId_trk1==9 && geantId_trk2==14 && geantId_trk3==45 && parentKey==1 &&  parentKey_trk2 ==1 && parentKey_trk3 ==1"; (means selection of good daughters , from the same mother 3H)