Dear Claus,
Thanks for the hard work and posting the results, this is precisiely the
kind of data that we I thought we could get out of the long runs at 90 and
12 deg;
- since people are getting up in the US you will get another set of comment
suggestions etc. (and more later it is a lab holiday though some folks are
in )
My first comments basically do not take into account too much of the other
comments
so there may be some overlap.
> The main physics plots will be
>
> - (h++h-)/2 pt spectra for 0-5, 5-10, 10-20 and ~40-60% centrality at
> eta=0.
>
Since the 40-60% comes from the non-trigger 6 events and the statistics does
not look too
bad it should be possible to get another bin say from 20-40 to extend the
systematics, in particular
if you make the powerlaw fits showing the n, and pt0 , and the <pt> from the
powerlaw shape.
Since this centrality region overlap with the trigger 6 the scale-down
factors and trigger mix has to be treated correctly.
> - pt ratio (R) of central (0-10) to semi-peripheral (~40-60). Here I
> conlude that we our measurements indicate a suppression of high pt
> particles when comparing central to semi-peripheral collisions - this
> comparison is of course independent on fit ranges and reference data
> taken with another experiment.
>
> - ratios of spectra to p+pbar reference (ua1) data. These ratios are
> dependent on the choice of reference data and fit ranges/methods.
> However, suppression of high pt hadrons is observed and it is more
> pronounced for the central collisions.
>
> - ratios of protons to all hadrons as function of pt. Mesonic vs. baryonic
> jets??? Who knows about this stuff? Is my result reasonalbe (I just
> pulled out the numbers)?
Did you do 'asymmetric pid at p>3.5 GeV for the protons and the
corresponding increased accpt?
Otherwise I think the p-bar/p are contaminated by kaons.
>
> - pi- spectrum at y approx 2.2 for 0-15% central. The statistics are
> unfortunately not good enough to make qualitative statements on the
> slope at high pt.
I think you should also make the h- spectra at this setting. For pt >=1 the
h- and pi-
can then be compared e.g. looking both directly at the data, and comparing.
This may help us dis-entangle the 'flat' plot of 0-10/(40-60).
Is this due to using identified pions, thus removing the possible fake high
pt- suppression
from the large inverse slope p-bar, and k-.
The y~2 should be binned in at least 250Mev/C bins, there are too many 1 and
2
counts out there.
The overlap between setttings looks good.
Could you also show us the 'raw' 40-60 spectrum . I know the statistics is
not good so
but even merged into the .5 GeV p(t) bins as you do in the final ratio plot
it is useful to judge the
significance (It looks form the ratio and errors that the last 3 bins has 4
, 2/3 and 1 count respectively).
-- Could someone else look into an estimate of Npart/Nbinary for the 40-60
selection for the way the selection
was done here. I we want to attempt to do the sigma/R(AA) we need such
numbers, and it is a sure question from the
audience.
Again, thanks for the plots
Flemming
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