From: yin.zhongbao@fi.uib.no
Date: Wed Jun 18 2003 - 16:43:22 EDT
Hi Claus, well done! With the new DST provided by you I have re-analyzed pi^- spectra at rapidity 2.2. It looks much better than what I showed in Krakow where the bdst used was built before Christmas. See http://www.fi.uib.no/~yin/spectraCentrality.gif where 0-10%, 10-20% and 40-60% are shown. The yield and slope for 10% central events is (almost) consitent with data shown by Djamel in QM'02. Two-slope struture disappeared. And the spectra is softer than that in midrapidity (PHENIX data). I will do some simulation with pythia to get reference data to see what the suppression looks like this time. If you think we can improve our data further, I would like to contribute in re-doing the global tracking and the bdsts (but not the first two points which may need experts working on DB. Certainly your help would be very much appreciated.:) Cheers, Zhongbao ----------- On Wed, 18 Jun 2003, Claus O. E. Jorgensen wrote: > > Greetings from Russia, > > Just a few comments on the high pt business. I agree with Flemming that > the y=0 and eta~2 suppression is consistent within the systematic errors. > The different 12 deg settings gives results within 30%, so one can move > the curve up and down depending on what setting one believes the most. I'm > convinced that there is a suppression, but on basis of the present data I > think it would be wrong to say that it's smaller or bigger that the y=0 > data. > > I also think it's a good idea to publish the high pt story ASAP, but the > 12 deg data needs some work. I would like to go back to the local tracking > level and do the global tracking with: > > 1) the right geometry (which I believe is in the DB now?) > 2) with the right parametrization of D1 and D2 magnetic fields > (has this been updated?). > 3) possibly the bfs tracking enhancement (if we can get the > right efficiency calculation) > 4) with global track refitting. > > This will hopefully improve the consistency between the settings. > For the analysis of identified particles I think it's unrealistic to > get on a short timescale (<1.5 month). So why not save this for later - we > can do the analysis during the fall and have the results as preliminary, > but let's publish after next run when the stat is better. > > If someone can redo the global tracking and the dsts (including the 4 > points above) I can redo the eta~2 analysis and produce a detailed note on > this during next week. > > Cheers, > > Claus > -- ----------------------------------------------------- Zhongbao YIN Phone: +47-55-582792 (O) Address: +47-55-276803 (H) Fantoftveien 14G 466 E-mail: 5075 Bergen Yin.Zhongbao@fi.uib.no ------------------------------------------------------
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