Minutes of BRHAMS Analysis Meeting Friday 04 Dec 2009 ===================================================== Agenda: http://indico.cern.ch/conferenceDisplay.py?confId=75852 updates on progress - rcf upgrade - pp paper - P/Pi referee report Some recent analysis for the pp 62/200 gev paper: Flemming d/p draft Michael Murray Present: Kris, Flemming, Michael, Steve Chellis, Ramiro Pawel 662GeV pp: Flemming =================== Flemming has revisited the data at high rapidity. Since the coverage is not great he has developed a 2 step procedure: Fit rapidity bins with sufficient low-pt coverage then Find y-dep T, or n,T dependent parameters finally fix these and fit all available y for Yield. (Effectively an independent fit at each rapidity.) (Correlation matrix is mainly diagonal) The procedure seems quite stable. Kris determined the rapidity dependent parameters in the final fit. (Kris got T, n from his favorite spectrum and then did a rapidity dependent fit to T and N using all spectra). Kris has compared to Pythia, see http://cyclotron.tamu.edu/hagel/dndy200_62.pdf. It does a better job at 200 rather than 62GeV, where it overestimates the pions at central rapidity. For both energies it gets the protons wrong. >>> Flemming and Kris want to have a draft out by Christmas. d/p: Michael ============ Michael has rewritten part of the paper dealing with feed-down corrections. The worst case is B2 at 2TeV where we have a 12% systematic error. Note that this is significantly smaller than our statistical errors. Putting bands on the plots would make things very crowded so we will try to have a figure for the correction and its error. Chellis asked are we seeing coalesence of quarks not nucleons. See QM Star talk on hypernuclei. Michael will think about this. Todo >>> Casper estimate systematic error by changing lambda/p ratio. (This depends on errors from PHENIX measurement of lambda's). AOB: ==== Ramiro was able to compile everything under the new RCF version of linux. He was not able to submit jobs with Condor. He thinks that it does not know what RUBY is. Steve says RUBY is not yet installed. Steve's programs are now working on RCF. ================= Submitted by Michael ======================= _______________________________________________ Brahms-l mailing list Brahms-l_at_lists.bnl.gov https://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Fri Dec 04 2009 - 10:26:15 EST
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