+ //
+ // This particle has to be kept
+
+}
+/*
+AliExternalTrackParam * AliTrackReference::MakeTrack(const AliTrackReference *ref, Double_t mass)
+{
+ //
+ // Make dummy track from the track reference
+ // negative mass means opposite charge
+ //
+ Double_t xx[5];
+ Double_t cc[15];
+ for (Int_t i=0;i<15;i++) cc[i]=0;
+ Double_t x = ref->X(), y = ref->Y(), z = ref->Z();
+ Double_t alpha = TMath::ATan2(y,x);
+ Double_t xr = TMath::Sqrt(x*x+y*y);
+ xx[0] = ref->LocalY();
+ xx[1] = z;
+ xx[3] = ref->Pz()/ref->Pt();
+ xx[4] = 1./ref->Pt();
+ if (mass<0) xx[4]*=-1.; // negative mass - negative direction
+ Double_t alphap = TMath::ATan2(ref->Py(),ref->Px())-alpha;
+ if (alphap> TMath::Pi()) alphap-=TMath::Pi();
+ if (alphap<-TMath::Pi()) alphap+=TMath::Pi();
+ xx[2] = TMath::Sin(alphap);
+
+ AliExternalTrackParam * track = new AliExternalTrackParam(xr,alpha,xx,cc);
+ return track;