class AlidNdPtHelper: public TObject

 Get the vertex from the ESD and returns it if the vertex is valid

 Second argument decides which vertex is used (this selects
 also the quality criteria that are applied)

 Checks if a vertex meets the needed quality criteria

 check whether particle has good DCAr(Pt) impact
 parameter. Only for TPC+ITS tracks (7*sigma cut)
 Origin: Andrea Dainese

 check primary particles
 depending on the particle mode

 check cosmic tracks

 Prints the given configuration

 Convert Abs(pdg) to pid
 (0 - e, 1 - muons, 2 - pions, 3 - kaons, 4 - protons, 5 -all rest)

 Create mean and resolution
 histograms

 Create resolution histograms

 all charged TPC particles

 Create ESD tracks from TPCinner parameters.
 Propagte to DCA to SPD vertex.
 Update using SPD vertex point (parameter)

 It is user responsibility to delete these tracks

 Create ESD tracks from TPCinner parameters.
 Propagte to DCA to Track or SPD vertex.
 Update using SPD vertex point (parameter)

 It is user responsibility to delete these tracks

 Propagte track to DCA to SPD vertex.
 Update using SPD vertex point (parameter)

 Propagte track to DCA to Track or SPD vertex.
 Update using SPD vertex point (parameter)

 select events with at least
 one reconstructed primary track in acceptance
 pT>0.5 GeV/c, |eta|<0.8 for cross section studies

 select events with at least
 one prompt (MC primary) track in acceptance
 pT>0.5 GeV/c, |eta|<0.8 for cross section studies

 get MB event track multiplicity

 get MB primary event track multiplicity

 data driven correction factor for secondaries
 underestimated secondaries with strangeness in Pythia (A. Dainese)

 data driven correction factor for secondaries (PbPb)

 linear interpolation

 calculate mc event true track multiplicity

 calculate mc event true track multiplicity

 print information about particles in the stack

 get contamination histogram

 scale by bin width

 calculate rel. difference

 calculate rel. difference
 between histogram and function

 normalise to event for a given multiplicity bin
 return pt histogram

 generate correction matrix

 generate correction matrix

 generate correction matrix

 generate contamination correction matrix

 generate contamination correction matrix

 generate contamination correction matrix

 TPC Z vertexer

 SPD track multiplicity

 SPD track multiplicity

 get the process type of the event.

 get the process type of the event.
 here kSD means (pure) single diffractive
 and kND means non-single-diffractive