- 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);
+ Double_t InvMass(const AliExternalTrackParam* d1, const AliExternalTrackParam* d2);
+ void CosThetaStar(const AliExternalTrackParam* n, const AliExternalTrackParam* p,Double_t &D0,Double_t &D0bar);
+ Double_t PointingAngle(const AliExternalTrackParam* n, const AliExternalTrackParam* p, const Double_t *pv, const Double_t *sv);
+ Double_t Pt(const AliExternalTrackParam* d1, const AliExternalTrackParam* d2);