STAR Collaboration Meeting, July 16, 2002 Manuel Calderón de la Barca Sánchez StMiniMcEvent.

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Presentation transcript:

STAR Collaboration Meeting, July 16, 2002 Manuel Calderón de la Barca Sánchez StMiniMcEvent

2 (Hopefully brief!) Why What is What has it been used for in Are there other potential uses for it?

3 So what is it? Qu’est-ce que c’est ce Situation: H StAssociationMaker is very general by design W It has to be useful for pretty much everyone! H A general spectra analysis needs several corrections, chiefly efficiency H Run several packages every time we change cuts: W StEvent + StMcEvent + StAssociationMaker + (something to calculate your General lament: “Wouldn’t it be nice to store some of the information Bum Choi actually took this on, I’m just the guy heckling over his shoulder…

4 Sounds Advantages H No need to rerun so many packages… H StAssociationMaker needs MC and reco hits W Save lots of disk Current status (tuned for single particle spectra, primaries): H Embedding data W acceptance, efficiency, momentum resolution corrections H Full simulation events (e.g. Hijing) W Above + background, merging, splitting, ghost tracks

5 Like most root TTrees, has several Branch to hold all MC Information H Can look at all the information of the input event W Acceptance is calculated from this Branch to hold Matched information H Pair-wise (MC  reco) information W Efficiency, momentum In full simulation: W Background contamination branch W Split track branch W Merged track branch W Ghost track branch

6 What has it been used So far, mainly spectra analysis H Efficiency, acceptance, etc. corrections used in h- & high-pt Testing efficiency of integrated tracker H Compare to current tracker on same footing

7 Other uses for Future: maybe combine with Frank’s common MuDst as another branch… H Case usage (Duncan) W Study efficiency as a function of other event-wise quantities, e.g. track density in a given region H Persistent V0 matching? H Interested parties can look in: H $STAR/StRoot/StMiniMcMaker/ H $STAR/StRoot/StMiniMcEvent/ W Send comments to Bum or to me.