Double_t InvMass(AliExternalTrackParam* d1, AliExternalTrackParam* d2);
void cosThetaStar(AliExternalTrackParam* n, AliExternalTrackParam* p,Double_t &D0,Double_t &D0bar);
Double_t pointingAngle(AliExternalTrackParam* n, AliExternalTrackParam* p, Double_t *pv, Double_t *sv);
+ Double_t Pt(AliExternalTrackParam* d1, AliExternalTrackParam* d2);
AliAODVertex* ReconstructSecondaryVertex(TObjArray *trkArray, Double_t b, AliESDVertex *v);