[Brahms-l] BUP

Hi BUP Writting Group,

Please find compilation of Krakow group comments on the BUP.

1. Now, Krakow Institute of Nuclear Physics is not represented in BRAHMS
   collaboration (J. Cibor quit physics in February).

2. Should be: Jagiellonian University.

3. Sec. High p_t suppression
Last sentence of the first paragraph:
Meaning of "cold" and "hot" medium should be explained?

4. Sec. System size dependence
1st and 2nd sentences:
The issue of going from AuAu to FeFe is not to get better determination of
the number of participants or even the centrality but to study systems with
the same collision geometry but different sizes.
We are not sure if the density is 'quite similar', that's why we are not
sure that these sentences are relevant for justification of FeFe choice.
The sentence starting with: "This will be very useful for studying
models of particle...." we propose to
replace by: "This will be very useful for better understanding
mechanisms of particle..."

5. Sec. Using the reaction plane
What is the advantage of the proposed measurements compared to what can
be achieved at other RHIC experiments (e.g. STAR)? If it is the wider
rapidity coverage, we think, that it should be explicitly mentioned in the
text.

6. Sec. Bulk properties
4th sentence starting with "From the proton and antiproton..." remove
"net" before "energy loss"
and "global" before "charged particle..." in the following sentence.
Two sentences starting with "The ability to detect..." and "Such
studies..." are repeated from previous section.
We are not sure whether the "Bulk properties" paragraph is a good place
to discuss the limiting fragmentation picture (the last 5 sentences).

7. Sec. Nucleon-Nucleus (d-Au) collisions
3rd sentence starting with "Although the prediction ..." it makes no
sense to write that CGC may exhibit a Cronin type enhancement.
>From our suspicion what the sentence is suppose to say we propose to replace
it by "the CGC may be hidden by a Cronin type enhancement".
Concerning the discussion of the suppression evolution with rapidity we
suggest to mention the approach of A. Capella et al (arXiv:hep-ph/0403081)
where they mentioned that our d-Au data can be explained
in terms of dynamical shadowing and nuclear attenuation at high
rapidities. It is not clear for us what could be done to disentangle
between CGC and this alternative scenario (obtain high statistics of d+Au
at high rapidities to extend p-t coverage and particle identification,
d+Au at lower energies?).

Best regards'

Pawel, Radek and Zbigniew



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