sPHENIX discussion of physics

[Anthony Frawley <afrawley AT fsu.edu>]

Hi All,

I would like to understand how the topical groups plan to make centrality selections when analyzing the MDC data.

What are people planning to do?

One could use the vertex object associated with each collision. The existing code (PHVertexFinder) will create a vertex object for each collision vertex and place it on the node tree in SvtxvertexMapActs. Each collision vertex will have a list of track keys associated with that vertex. That list can be used to access the tracks from SvtxTrackMap. The most basic centrality selection could be just the number of tracks associated with the collision vertex. More advanced selections could involve applying cuts on the associated tracks.

Cheers

Tony