Minutes of BRAHMS Analysis Meeting 06 Nov 2009 ============================================== Present: Flemming, JH, Ramiro, Chellis, Pawel, Kris, Michael Telephone number 631 344 6261 Agenda: ======= http://indico.cern.ch/conferenceDisplay.py?confId=73389 09:30 More on p + p Stopping Kris 09:50 d/p lambda corr systematic Casper Nygaard (Niels Bohr Institute) 10:10 preliminary data tables for p_to pi paper Pawel Staszel Action Items: ============ Todo >> Kris, get more statistics from Pythia so that he has a small systematic error on net baryon correction. Todo >> Casper present systematic error from the lambda correction as bands on figures. Todo >> Michael redo text to describe new plots and systematic errors. Todo >> Pawel redo format of data tables. More on pp stopping Kris ======================== Kris has rebinned his net-lambda/net-proton and net-neutron/net- proton from Pythia and then used fits to the distribution to calculate correction factors. (Note NA49 already corrected for lambdas). He takes dN/dXf at 17GeV and then transforms to 62 and 200GeV. His results seem to show that the Xf distribution is remarkable similar from 17 to 200GeV in pp collisions. This is in contrast to the AuAu case where it changed from almost full stopping to high transparency. Todo >> Kris, get more statistics from Pythia so that he has a small systematic error on net baryon correction. d/p lambda corr systematic: Casper =================================== Casper had calculated the feed-down correction for the proton spectra. He has used 3 assumptions for the ratio of the temperatures 1) T_lambda = T_proton 2) T_lambda = (M_lambda/M_proton) * T_proton and finally 3) assuming that the avearge kinetic energy of the particles is proportional to the mass. This was shown by Steve in QM09 and gives a lambda temperature that is intermediate between 1) and 2). He then propagated these errors to B2. Todo >> Since the systematic error from the correction is correlated across Pt It was decided to present these as bands. Todo >> Michael redo text to describe new plots and systematic errors. preliminary data tables for p_to pi paper: Pawel ================================================ Pawel showed his data tables for the p/pi paper, see http://zefir.if.uj.edu.pl/staszel/brahms/plb_ptopi/auau_200_pos_v1.5.txt There were some comments about making the format easier to read into root. AOB: After next week Flemming will start to attack the big AuAu paper. Pawel would like to work on the nuclear modification factor at forward rapidity. Ramiro is working on the dA analysis, in particular the small angles. Next weeks meeting is cancelled. ===================== Submitted by Michael Murray ==================== _______________________________________________ Brahms-l mailing list Brahms-l_at_lists.bnl.gov https://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Fri Nov 06 2009 - 10:39:32 EST
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