Difference: GlobalParticleIDSoftware (3 vs. 4)

Revision 42006-12-12 - unknown

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META TOPICPARENT name="GlobalParticleID"

Global Particle ID Software in LHCb

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  * To Be Filled *
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ProtoParticles

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Particles and ProtoParticles

  At the end of of the Brunel event processing, a final stage is run which forms ProtoParticle data objects.
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These objects are designed to represent a single reconstructed object (charged or neutral) in LHCB and to summarise all the quantities associated to that object.
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These objects are designed to represent a single reconstructed object (charged or neutral) in LHCB and to summarise all the quantities associated to that object. These ProtoParticles are stored in the final DSTs at the end of processing.

During processing in DaVinci, when the DSTs are read back in for physics analysis, one of the first steps that is need is to produce Particle candidates from the ProtoParticles. Each ProtoParticle can be made into zero, one or many ProtoParticles (with different PID types) depending on the PID information stored in the ProtoParticle and the PID selection cuts that are applied. This step is gnereally referred to as the 'ParticleMaker' step. For charged ProtoParticles, the CombinedParticleMaker is generally used, whilst for neutrals there are a selection of possible Particle Makers.

 

Gobal Particle ID

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DC04

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Global PID was first introduced during the analysis of the DC04 data. The original study was performed by Roger Forty. For futher information, see these emails from Roger.
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Global PID was first introduced during the analysis of the DC04 data. The original study was performed by Roger Forty. The CombinedParticleMaker was first developed for the DC04 analyses. In this implementation, it was only possible to make selections based on cuts on the 'CombinedDLL' values. For futher information, see these emails from Roger.

DC06

During the transistion to the DC06 software framework, several changes where made to how the ProtoParticles are created and used :-

  • Firstly, they are now created (as originally intended) at the end of the processing in Brunel. In DC04 they are actually produced at the start of each event in DaVinci.
  • The amount of information stored in the ProtoParticle was extended.
 
ChrisRJones - 17 Nov 2006 \ No newline at end of file
 
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