xAOD DecayVertex Code

The DecayVertex code is the rewritten version of V0Tools so that it is compatible with the xAOD. The DecayVertex code is a more object orientated approach to the V0Tools. This was done as almost all of the V0Tools functions had a vertex as an input, whereas now the DecayVertex class inherits from the xAOD vertex class and is constructed using a copy constructor so the DecayVertex functions do not need a vertex as an input except for those calculating distance between vertices

Functions that work

Currently all functions that do not rely on TrackParticle parameters work and have been tested.

The functions that do rely on TrackParticle parameters, such as the errors on parameters, will work if the JpsiCandidates have tracks added to the vertex and stored as PrimaryVertices are. If not functions such as the DecayVertex::getRefPx(size_t Index) would be required. This is needed for the phi, theta and qOverP functions.

How to use Dec

Locations of useful files

The current V0Tools is located in /Tracking/TrkVertexFitter/TrkVertexAnalysisUtils/trunk

The header files VxVertex.h, ExtendedVxCandidate.h and VxCandidate.h are located in /Tracking/TrkEvent/VxVertex/trunk/VxVertex

The xAOD files are located in /Event/xAOD

Most of the files that will be used will be located in /Event/xAOD/xAODTracking

Some other xAOD files that are used are /Event/xAOD/xAODBase/trunk/xAODBase/IParticle which links to the TLorentzVector class to allow for the same operations on 4-vectors as used in ROOT

Current problems

Notes

-- David Lack - 2014-07-29

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