Minutes of BRAHMS analysis meeting Friday 1 May 2009 ==================================================== Present: Kris, Steve, Flemming, Chellis, Michael and Ian Agenda and slides at http://indico.cern.ch/conferenceDisplay.py?confId=58147 09:30 dAu spectra comparisons R. Debbe BNL 09:45 pp paper progress F.Videbaek 10:05 Identified Raa's at 62 GeV A.Qville Ramiro: dAu spectra comparisons =============================== Ramiro compared spectra generated with dst2spec and SpectraObject (These were done by Hongyan and himself). Hongyan spectra are about 2 * larger than his. When he has generated spectra generated with SpectraObject and Flemming’s dst2spec package. This looks nice on a semilog plot but he would like to rebin his data to make a ratio and test the comparison in detail. He will compare the pp spectra from Hongyan with others generated to see if there is also a factor of 2 difference. His pion and protons are ready to go at all rapidity but for kaons he has to use H2. This is a little messy but he thinks he can solve this and then integrate the spectra to get dN/dy. He would like to start writing the paper. Flemming pp paper progress ========================== Flemming has been preparing a very big paper 33 pages on pp collisions. We reviewed the figures. (I missed the first part) Fig 11 perhaps we should mention the fraction of the dN/dy covered. Note Fig 12 Individual mean pt where we have good coverage versus the systematic pt from the global levy fit. (Triangles cause confusion since center of point is not at center of triangle). Fig 13 It looks like the p/pi ratio rises and falls with a peak around 1.5GeV. Both Fig 13 and 14 should be improved to look less cluttered. For Fig 15 we have comparisons to perturbative calculations. These should be updated. Perhaps we could have them for all our data sets. Fig 16 and 17 show limiting fragmentation. New figures: Wong from ORNL would like to have energy loss from net baryon rapidity loss and particle yields. We would like to compare our data to Pythia. (It does not seem to be doing perfectly). Figs 20 and 21 show a nice comparison to ISR data. All of the collaboration are invited to review the paper and make comments about both the text and pictures. Atla: Identified Raa's at 62 GeV ================================ At y=0 h e sees very little difference between + and - for pions. For kaons and protons there is a similar situation but he will use larger Pt bins to make the data clearer. Atla also had identified Raa vs centrality for both pi,k,p (and antiparticles) for AuAu and CuCu. This looks like a very nice systematic study. =================================== Submitted by Michael Murray =========== _______________________________________________ Brahms-l mailing list Brahms-l_at_lists.bnl.gov https://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Fri May 01 2009 - 16:45:44 EDT
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