Hi,
On Tue, 27 Nov 2001, Jens Jørgen Gaardhøje wrote:
> 2) For the increase of the p+p at midrapidity (also 14%) I don't recall that
> we have exact number at the lower energy. This is an extrapolation right? If
> we cannit find a better number lets leave the rounded value. TRINE????
As far as I know it's an extrapolation - I've never seen a pp datapoint quoted
for 130 GeV. Maybe one should say something like "For comparison, the similar
number for proton-proton collisions at this energy is 2.5, which is 14%
larger than the interpolated value at 130 GeV".
> 3) For the increase of the central over p+p (IS THIS p+p or p+PBAR ????, I
> guess the latter)
You're right - it's p+pbar.
> we have 632 +- 55 and 2.48 +- 0.07
> After rescaling by 345/2 and adding errors in quadrature I get an
> increase of 48 % +- 9%.
> I have modified the text accordingly. Please check, someone.
48% +- 13% (relative error 0.09 on ratio of 1.48?)
> > We note that
> > the measured distributions show a small increase in width with
> > decreasing centrality (from $\sigma_{RMS}=2.33\pm 0.02$ for 0-5\%
> > to $2.4 \pm 0.02$ for 40-50\%), to be compared to $RMS= 2.38 \pm 0.05$
> > for the p+p data.
I'm not sure it's safe to quote a RMS value for pp when the numbers were
extracted using a figure and a ruler .... maybe one should just say that the
pp RMS value is within the AuAu RMS range, within errors and centrality
variations? When I change the Eta scale within "reasonable limits as seen by
my subjective eye", RMS_pp varies from 2.35+-0.015 to 2.395 +-0.015, with the
error 0.015 coming from ruler-measured dN/dEta error bars .....
It would be nice with one sentence about physics implications ... what
should we really expect for RMS_pp vs RMS_AuAu at this energy? Any good
references on SPS data comparing RMS_AA (or data usable for extracting such)
for different centralities and to pp at the same energy? What would be the
width increase from 130 to 200 GeV (and with centrality) predicted by the
models?
Trine
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