[Brahms-l] QM abstract

Hi BRAHMS,

    Here is my abstract for QM2006. Please send 
comments and suggestions.

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     Centrality Dependence of Charged Hadron Pt Spectra at Forward Rapidities
                    in Cu-Cu Collisions at 200 GeV/NN

It has been found in Au+Au collisions at RHIC that the total charged particle production
 scales with the number of participants and the particle density in the mid-rapidity
 region changes smoothly as a function of beam energy. The charged particle density
reflects the time integral over a variety of physics processes that play a role
in particle production. Results from AuAu collisions at 200 GeV/NN at RHIC show suppression 
of the high-pt hadron yields at mid-rapidity in contrast to the enhancement in high-pt hadron 
production observed in dAu collisions. Surprisingly, comparable suppression has also been 
observed in both AuAu and dAu collisions at forward rapidity. While the cause of the suppression 
at forward rapidity is not very well understood, the suppression at mid-rapidity is 
believed to be due to final state effects such as partonic energy loss in the dense medium.
 Comparing data from different collision systems may help us understand the underlying 
mechanism for the suppression at forward rapidity. We present preliminary results from 
CuCu collisions at 200 GeV/NN at the BRAHMS experiment on charged hadron pt spectra. 
The evolution of the particle density and nuclear modification factors is studied as a 
function of centrality at forward rapidities. The results will be compared with observations
 from dAu and AuAu collisions at the same energy. Scaling properties of particle production 
with respect to number of participants and binary collisions will also be discussed.
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Thanks in advance,

Selemon
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