[Brahms-soft-l] analysis status

Since considerable effort has been spend over the summer to get code, and calibrations ready for physics analysis
of the 200 GeV run-4 data I will try to summarize the situation as I understand it at this point in time now that fall has arrived. Some of this information has already been sent to the list, and/or exchanged between a smaller of party of people actively working.
The priorities set early on was to complete the 62.4 gev data, and the pp this being the smaller data set ,and to
make a first nearly complete set of runs containing 4 deg high field running, and a good set of 40 deg high field running. This restriction on the 200 gev data in large part due to the very large size that makes replaying the data in
case problems are found quite time-consuming. To give you an idea the typical cpu time for a ltr of a single sequence is 3-5 hours, and 1 hours for gtr. This mena s that complete reruns of data take in order on 1-2 month not a few days as we are used to with the previous years dataset. I will like to acknowledge some of the main people who have worked on the analysis, but also making clear others have contributed as well to identify and solve problems with the data.

The first steps of getting ready for the local tracking step involved work to have the TPC and DC calibrations done for extended regions (Pawel, Tomasz, Eun-Joo, Truls and others). At this point good DC calibration exsists except for
auau-200 above 10720, but the work is in progress. 
Concurrently the filecatalog, utility scripts were developed, and debuggged during the initial production of the 62 gev data. This also includes considerable change of the brat code (Hiro, Djamel). 

For the generation of gtr we need good calibrations of
a) BB
b) ZDC
c) centrality
+misc
This has been an iterative process, and whilts the first set of BB calibrations were reasonable in most cases, they were not perfect and real problems identified (JHL). The final (hopefully) BB calibration (thanks to Catelin and Hiro) were committed just now, the ZDC's were done by Bjoern, and centrality done and redone by Steve and his students. From my understanding these latest calibrations essentially effects the vertex , while the t0 (apart from fluctuations) should not have changed too much.
To check that these indeed are good a subset of data crarried through to the dst level were redone today(run 10367- 10424) in order to check the latest BB cal.The ZDC offsets also needs some rechecking.
The centrality cal. are being redone due in part to this and is planned to be committed within 1-2 days (SJS).

Since we cannot have all runs on disk from ltr, the process has to be priotirized. The (suggestion) plan is to do the highfield 4 deg in the range (10251-10492) where ltss are already done , the 2 deg runs (also all done for ltr)
and a subset of runs for max field with mrs at 40 and 90 deg. (in range runs < 10720). This will give a first set of
data for physics analysis once the tof calibrations (particular for h1, and h2 are done).
Once we thinks these are fine and good at the dst level, the ltr's can be moved to hpss freeing up diskspace and the remaining (or at least a significant part can be reconstructed).

As said before please inform the soft-l list on progress on analysis (i.e. generation of data files etc) and keep
code issues to the devlist.

best regards
    Flemming
 


----------------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106



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