A brief look at pp 2008 data using my electron analysis code.

20 runs were randomly selected out of a file_catalog query using the following conditions:

collision=pp200,production=P08ie,trgsetupname=ppProduction2008||ppProduction2008-2,tpc=1,emc=1,filename~st_physics,filetype=daq_reco_mudst,runtype=physics

Part 2: Momentum, Energy, P/E, dE/dx

Overall, they seems comparable to 2006 data.

Primary Vertex:

The only major difference I found between 2008 data and 2006 data was the number of primary vertices available in a given event (obtained from StMuDst::numberOfPrimaryVertices() less invalid primary vertices determined using StThreeVectorF::valid()).

Apparently these include negative-ranked primary vertices, which only require one (instead of two) associated tracks to point to a fast detector.

There should be about similar number of positive-ranked vertices as in 2006. Will modify code to check.

 Note: By first, second, etc, I'm referring to their order in the array of primary vertices. It used to also reflect ranking. I'm not sure where the negative-ranked vertices are placed, in this case.

Number of tracks:

 The following shows the number of primary tracks per event. I can't easily check the number of primary tracks per vertex.

Unfortunately I don't have the numbers for TPC primary tracks with some quality cuts applies. What I have is the number of primary tracks that are successfully matched to EMC points.

EMC Points:

Track properties:

Projected coordinates of primary tracks projected to SMD radius using helical trajectory.

Coordinates of matched EMC points

Part 2: Momentum, Energy, P/E, dE/dx

Additional figures available: