class AliHFEsecVtx: public TObject

 Default constructor

 Copy constructor

 Assignment operator

 Destructor

 set pdg code and index

 Run Process

if(signalTrack->Pt() < 1.0) return;

 create histograms

 get primary characteristics and set

 calculate e-h pair characteristics and tag pair

 run secondary vertexing algorithm and do tagging

 find secondary vertex candidate and store them into container

 fill 3 tracks' secondary vertex properties

 fill 3 tracks' secondary vertex properties

 fill 2 tracks' secondary vertex properties

 calculate secondary vertex properties

 calculate secondary vertex properties

 reccalculate primary vertex after removing considering track in the calculation

 return mc pid

 return pdg code of the origin(source) of the pair


 ---*---*---*-----ancester A----- track1
                        |____*______
                             |______ track2
 => if they originated from same ancester,
    then return "the absolute value of pdg code of ancester A"

 ---*---*---B hadron-----ancester A----- track1
                               |____*______
                                    |______ track2
 => if they originated from same ancester, and this ancester originally comes from B hadrons
    then return -1*"the absolute value of pdg code of ancester A"

 caution : it can also return parton pdg code if it originated from same string or gluon spliting.

 return pair code which is predefinded as:
  kDirectCharm, kDirectBeauty, kBeautyCharm, kGamma, kPi0,
  kElse, kBeautyGamma, kBeautyPi0, kBeautyElse

 return decay electron's origin

 get KF particle input pdg for mass hypothesis

 return mc pdg code

 calculate likehood for esd pid

 Add a HFE pair to the array

 Returns the list of HFE pairs

 Delete the list of HFE pairs

 Initialization should be done before make all possible pairs for a given electron candidate

 Add a HFE secondary vertex to the array

 Returns the list of HFE secvtx

 Delete the list of HFE pairs

 Initialization should be done