From: Trine S. Tveter (trine@lynx.uio.no)
Date: Thu Jun 26 2003 - 06:39:59 EDT
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
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