BRAHMS Weekly analysis meeting Friday 13th March 2009 ===================================================== Present: JH, Flemming, Chellis, Ramiro, Selemon, Steve, Michael Agenda and slides: http://indico.cern.ch/conferenceDisplay.py?confId=54564 Flemming: News Flemming has been collecting model predictions from various groups. He is putting some slides on his web page. Look at http://www4.rcf.bnl.gov/~videbaek/analysis/auau62/netp.png which compares central and peripheral net proton distribution. The peripheral distribution is scaled by n_part. The model shows that central collisions are better at pushing protons into the central region. Steve: Flow update: =================== Steve has compared his old and new analysis on an event by event basis and finds that they are consistent. When he extract V2 he finds that the 2 analysis are statistically consistent even though they are at the limits of the error bars. He compared his method of calculating the reaction plane to the method that Hiro and Eric use. They used raw energy while he is using calibrated multiplicity. (Note that fractional multiplicities are allowed). The overall distributions look similar. His final conclusion is that the two analysis are consistent. The earlier analysis looks cleaner, perhaps because flattening was more finly tuned. He prefers the new analysis since he thinks it is more robust to angle dependent bias. Victoria has been running HYDROJET in purely hydro mode. It looks like a reasonable comparison to Flemmings spectra. There is some deviation from the proton spectrum at 40 degrees. Ramiro suggested turning on the JAM after-burner. Ramiro comments that the V2 from the model should include the contribution of the model. This is most important at low pT. Victoria can make V2 vs Pt. Selemon thinks one file has V2 and another file V2 with resonances. JH would like to compare <pT> for data an Hydrojet. (Note this will depend on resonances). Selemon: CuCu poster ==================== He now has the layout ready and some plots. He is going to look at JH hydro calculations. He will send out the first draft today. Ramiro: He is concentrating on rapidity 3 for dA analysis. He is concentrating on k and proton analysis for both charges. He has used Kris's root file to get spectra for pp. He is working on dealing with contamination. He can deliver RdA vs centrality with PID. Positives are easier. There seems to be something interesting with pbars. Kris: pp ======== He is doing a global fit to the proton spectra. It is currently having some trouble after he rebinned. Flemming says that his works fine. ====== Minutes prepared by Michael Murray ============================================== _______________________________________________ Brahms-l mailing list Brahms-l_at_lists.bnl.gov https://lists.bnl.gov/mailman/listinfo/brahms-lReceived on Fri Mar 13 2009 - 10:26:40 EDT
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