xAOD DecayVertexTools

This page is for rough notes and bits of documentation while changing the old V0Tools to work with the xAOD.

Currently working on making the invariant mass functions work with the xAOD TrackPartcle _v1 functions.

The TrackParticle _v1 functions:

• Four momentum - TrackParticle::FourMom_t &p4()
  • The FourMom _t object is from the IParticle class which uses the TLorentzVector class.
  • IParticle.h is located in Event/xAOD/xAODBase/trunk/xAODBASE/
• Energy - TrackParticle _v1::e()
• Mass - TrackParticle _v1::m()
• Transverse momentum - TrackParticle _v1::pt()
• Eta - TrackParticle::eta()
• Rapidity - TrackParticle _v1::rapidity()

Notes

Currently uses the format of the old code, the invariantMass function calls a track4Momentum function which calls a trackMomentum fucntion.

This trackMomentum function uses Amg::Vector3D not sure what the header for this is at the moment

-- David Lack - 2014-07-29

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