class AliTwoParticlePIDCorr: public AliAnalysisTaskSE

 The last in the above list should not have a comma after it

 Destructor. Clean-up the output list, but not the histograms that are put inside
 (the list is owner and will clean-up these histograms). Protect in PROOF case.

 returns histo named name

 Puts the argument in the range [-pi/2,3 pi/2].

 Create histograms
 Called once (on the worker node)

 clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)

This function is called only when applyefficiency=kTRUE; also ensure that "track" is present before calling that function

This function is called within the func GetParticle() for accepted tracks only i.e.after call of Classifytrack() & for those tracks which have proper TPC PID response . combined nsigma(circular) cut only for particles having pt upto  4.0 Gev/c and beyond that use the asymmetric nsigma cut around pion's mean position in TPC ( while filling the  TObjArray for trig & asso )

this function is always called after calling the function CalculateNSigmas(AliAODTrack *track)

this function is always called after calling the function CalculateNSigmas(AliAODTrack *track)

mainly intended to check the probability of the PID of the tracks which are in the overlapping nSigma regions and near about the middle position from the   mean position of two ID particle

 Bayesian PID calculation

return the specie according to the minimum nsigma value
no double counting, this has to be evaluated using CheckDoubleCounting()

 check PID signal

 check TOF matched track
ULong_t status=track->GetStatus();
if  (!( (status & AliAODTrack::kITSin  ) == AliAODTrack::kITSin  )) return kFALSE;

 calculate inv mass squared
 same can be achieved, but with more computing time with
TLorentzVector photon, p1, p2;
  p1.SetPtEtaPhiM(triggerParticle->Pt(), triggerEta, triggerParticle->Phi(), 0.510e-3);
  p2.SetPtEtaPhiM(particle->Pt(), eta[j], particle->Phi(), 0.510e-3);
  photon = p1+p2;
photon.M()

 calculate inv mass squared approximately

 calculates dphistar

 This method is a copy from AliUEHist::GetBinning
 takes the binning from <configuration> identified by <tag>
 configuration syntax example:
 eta: 2.4, -2.3, -2.2, -2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, -1.2, -1.1, -1.0, -0.9, -0.8, -0.7, -0.6, -0.5, -0.4, -0.3, -0.2, -0.1, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4
 phi: .....

 returns bin edges which have to be deleted by the caller

 check if the track status flags are set

 rejects "randomly" events such that the centrality gets flat
 uses fCentralityWeights histogram

 shifts the phi angle of all tracks by angle
 0 <= angle <= 2pi

Function to setup the VZERO gain equalization
Get the equilization map

Function that returns the reference multiplicity from AODs (data or reco MC, Not for Truth)
Different ref. mult. implemented: V0M, V0A, V0C, TPC

do the event selection(zvtx, pileup, centrality/multiplicity cut) and then return the value of the centrality of that event

to check whether a daughter being taken as associated

 Draw result to screen, or perform fitting, normalizations
 Called once at the end of the query

only one can be kTRUE at a time(for the next two Setters)

PID Type

NSigma cut
set cut on beyesian probability

****************************************************************************************EP related part

v0 daughters

fEtaLimitDaughter=EtaLimit;//0.8

set PID Combined