[Brahms-dev-l] PANIC05 abstract

Hi All,

   please find the abstract I intend to submit to PANIC05. I appreciate
suggestions and comments. Thanks!

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High Pt suppression in CuCu Collsions at 200 GeV/NN.


Collisions between hadronic systems at relativistic energies provide 
a window on the small-x gluon distributions of fast moving nuclei. It has been 
predicted that gluon saturation effects will manifest themselves as a suppression
in the transverse momentum distribution at a scale which is connected with the
rapidity of the measured particles. Saturation effects are most evident at large 
(pseudo)-rapidity, i.e at small angles relative to the beam direction. BRAHMS has
already studied the rapidity dependence of the nuclear modification factor as a 
function of rapidity in dAu and AuAu collisions. While the absence of high Pt suppression
 around midrapidity rules out initial state effects, a marked high Pt suppression with
 increasing pseudorapidity may be related to the initial conditions of the colliding 
deutron and gold nuclei, in particular to the possible existence of the color glass 
condensate(CGC) which is a theory that describes the ground state of fast moving nuclei
 prior to collision. For AuAu collisions, we do see a suppression at (pseudo)-rapidity ~ 3
which seems to favor the CGC scenario. The dependence of the nuclear modification factors 
on the number of participants also provides additional information on the mechanism 
underlying the observed suppression. We present results for the nuclear modification 
factor Rcp at forward rapidities for CuCu collsions at 200 GeV/NN. The results will 
be compared to previous results in AuAu and dAu collisions at the same enrgy.
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Selemon,

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