From: Ian Bearden (bearden@nbi.dk)
Date: Thu Jun 26 2003 - 07:27:28 EDT
Hej Trine, Thanks for your comments! I agree that the Rcp is nice since we remove the p+pbar reference. About the 'selling point:' I think that the only statement the data allow us to make at this time is that the suppression is the same or stronger at eta=2.2 than the suppression at eta=0. As for the figures you ask for, we are putting together a web page about the analysis (similar to what Claus did for the d+Au analysis) and the plot will be there. As to the centrality: It is not possible now to go more peripheral, but perhaps with a decent spectrometer trigger (in the upcoming Au+au run) we can do this. Again, thanks for the input, Cheers, Ian On torsdag, jun 26, 2003, at 12:39 Europe/Copenhagen, Trine S. Tveter wrote: > Dear all, > > On Wed, 25 Jun 2003, Jens Jørgen Gaardhøje wrote: > >> Enclosed please find an updated version of the high pt paper draft. > >> Claus has worked hard at a reanalysis and along the way we have >> changed the >> figure strategy to focus more on the rapidity dependence, which is >> the BRAHMS >> specialty. At the same time we focus more on the relative changes >> between >> spectra and ratios. This should make us more independent of the p+p >> 'reference' >> and of various systematic errors. > > I think the draft has really gained from the stronger focus on our > unique > rapidity dependence and the emphasis on differential behaviour (R_CPs > and > ratios of R_CP between different rapidities, which are independent of > our somewhat dubious "reference" spectrum.) > >> We have been debating whether to show all 4 centrality cuts or just 2 >> as in >> here. Opinions? > > It would have been interesting at least as a basis for discussion to > see all 4 > centrality cuts. It would also strengthen the statistical material. > The evidence > for stronger suppression at eta~2 is based on 3 points with large > error bars > (Figure 3.) I'm curious whether "R_CP"s utilizing more centrality > bins would > confirm this trend - maybe one could use the central spectrum as > reference since > it has smaller error bars, and compare also R(0-10/20-40) and > R(0-10/10-20) > for the two rapidities? > > Is it possible at all to extract spectra for centralities in the region > 60 - 100%? > >> Claus hopes to be able to post a web page with details of the >> analysis later. > >> We have had various input (ZBY, JN, MM, KH etc..). Not all has been >> included >> yet into the manuscript. Not because of lack of good will but because >> of lack of time. > >> Hope your comments will continue flowing. They are necessary if we >> are to >> attempt a submission not too far behind the other 3 experiments. >> All sorts of comments are greatly appreciated. Particularly those >> that also >> concretely suggest a solution to a given problem. > > The effect of momentum resolution might be a little different in MRS > and FS, > which would affect the R_AAs slightly. (It would of course not affect > the > R_CPs :-)) The spectra could easily be corrected for this effect, to > the > extent we know the parameters of our Gaussian smearing. I believe the > corrected spectra would be relatively softer at eta~2. > >> In particular we request your opinion about whether this approach >> (text and >> figures) is suitable. If the general idea is acceptable by a >> majority, the next >> job is to improve the quality of the draft, of figure appearance etc, >> while >> continuing analysis checks. Parallel processing is necessary. > > The general idea is fine in my opinion :-) > > Cheers, Trine > >
This archive was generated by hypermail 2.1.5 : Thu Jun 26 2003 - 07:31:14 EDT