Dear Trine Many thanks for the plots. It seems that I should replace my ruler.... I agree that the RMS as plotted, appears to show a stat. significant increase, although the effect is only about 3% from centrality class 1 to 6 at 200 but appears to be about twice that for 130GeV. But what does (would) it mean? We can certainly add a sentence in the paper, if people think so! Opinions? Suitable ref. for SPS? I have identified a few sentences that could give us more space for physics discussion : if squeezed I would cut the listing of the number of tiles/wafers installed. cheers JJ ________________________________ Jens Jørgen Gaardhøje Assoc. prof. Dr. Scient. Chair Ph.D: school of Physics NBI.f.AFG. (secretariat. 35 32 04 41) Chair science committee. UNESCO Natl. Commission. (secretariat. 33 92 52 16) Office: Niels Bohr Institute, Blegdamsvej 17, 2100, Copenhagen, Denmark. Tlf: (+45) 35 32 53 09 Fax: (+45) 35 32 50 16 ________________________________ ----- Original Message ----- From: "Trine S. Tveter" <trine@lynx.uio.no> To: <brahms-l@bnl.gov> Cc: <trine@lynx.uio.no> Sent: Friday, November 23, 2001 11:52 AM Subject: Re: width of dnd/deta > Hi collaborators, > > On Wed, 21 Nov 2001, Chellis Chasman wrote: > > > 1) As I have said, I believe we have independent evidence > > that the distributions become narrower with increased > > centrality. This seems counter-intuitive to me and thus > > an interesting observation. Perhaps it is worth a > > sentence in the paper. > > and on Thu, 22 Nov 2001, Dieter Rohrich wrote: > > > At SPS, the h- rapidity distribution is narrower in central > > nucleus-nucleus collisions than in nucleon-nucleon. It is not a big > > effect, but it is significant. I would like to support Chellis' > > proposal to add a sentence and/or to include the RMS/FWHM in the table > > - if a quantitative analysis (RMS from the histogram, 2-Gaussian fit, > > etc.) confirms Chellis' observation. > > I calculated the RMS values for the dN/dEta distributions > of various centrality classes for 200 and 130 GeV, from the > data in the files dndeta_sym_200.dat and dndeta_sym_130.dat > found at "the usual place at the kansas account". > The results are plotted as a function of centrality class > (1 = 0-5%, 6 = 40-50%) in the figures: > > http://lynx.uio.no/~trine/brahms/mult/RMS_fullerrors.gif > (using the full errors taken from the .dat files) > > http://lynx.uio.no/~trine/brahms/mult/RMS_smallerrors.gif > (using the 3% point-to-point errors like in the alpha,beta fits) > > Upper panels: Red points 200 GeV data, blue points 130 GeV data. > Lower panels: RMS 200 GeV / RMS 130 GeV. > > The trend pointed out by Chellis looks significant. Also there > are indications that the width increase from 130 to 200 GeV > is stronger for the more central collisions (as also seen from > our figure 4.) What do you think - does this merit a sentence > in the paper? > > The numbers are given below for reference. > > Best wishes, > Trine > _____________________________________________________________ > > Full errors: > 0-5%: > RMS200: 2.32861+-0.0253931 RMS130: 2.21047+-0.024398 > Ratio: 1.05345+-0.0163451 > 5-10%: > RMS200: 2.3554+-0.0252404 RMS130: 2.23798+-0.0244402 > Ratio: 1.05247+-0.0161029 > 10-20%: > RMS200: 2.37433+-0.0252682 RMS130: 2.25484+-0.02383 > Ratio: 1.05299+-0.0157931 > 20-30%: > RMS200: 2.38742+-0.0255841 RMS130: 2.27923+-0.024796 > Ratio: 1.04747+-0.0159955 > 30-40%: > RMS200: 2.39571+-0.0255872 RMS130: 2.30663+-0.0247556 > Ratio: 1.03862+-0.0157259 > 40-50%: > RMS200: 2.40582+-0.025714 RMS130: 2.32596+-0.0251689 > Ratio: 1.03433+-0.0157317 > > Point-to-point errors of 3% on dN/dEta: > 0-5%: > RMS200: 2.32861+-0.00792104 RMS130: 2.21047+-0.00761942 > Ratio: 1.05345+-0.00510162 > 5-10%: > RMS200: 2.3554+-0.00793332 RMS130: 2.23798+-0.00766753 > Ratio: 1.05247+-0.00505651 > 10-20%: > RMS200: 2.37433+-0.00796683 RMS130: 2.25484+-0.00771144 > Ratio: 1.05299+-0.00504501 > 20-30%: > RMS200: 2.38742+-0.00795419 RMS130: 2.27923+-0.00776257 > Ratio: 1.04747+-0.00499057 > 30-40%: > RMS200: 2.39571+-0.00795148 RMS130: 2.30663+-0.00779476 > Ratio: 1.03862+-0.00491955 > 40-50%: > RMS200: 2.40582+-0.00793511 RMS130: 2.32596+-0.00777788 > Ratio: 1.03433+-0.00485815 > > >
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