[Brahms-l] Fw: new Phobos paper on shape of pseudorapidity distributions

FYI
Subject: new Phobos paper on shape of pseudorapidity distributions


> Dear Peter, Steve, Bill, Flemming, and Tim:
> 
> It is my pleasure to announce that in one week's time Phobos intends  
> to submit the
> following paper to PRL.
> 
> All the best,
> Wit
> 
> 
> 
> Title:
> System Size, Energy and Centrality Dependence of Pseudorapidity
> Distributions of Charged Particles in Relativistic Heavy Ion Collisions
> 
> Abstract:
> We present the first measurements of the pseudorapidity
> distribution of primary charged particles in Cu+Cu collisions as a
> function of collision centrality and energy, sqrtsnn = 22.4, 62.4 and
> 200 GeV, over a wide range of pseudorapidity, using the PHOBOS
> detector.  Making a global comparison of Cu+Cu and Au+Au results, we
> find that the total number of produced charged particles and the
> rough shape (height and width) of the pseudorapidity distributions
> are determined by the number of nucleon participants. More detailed
> studies reveal that a more precise matching of the shape of the Cu+Cu
> and Au+Au pseudorapidity distributions over the full range of
> pseudorapidity occurs for the same Npart/2A value rather than the
> same Npart value. In other words, it is the collision geometry
> rather than just the number of nucleon participants that drives the
> detailed shape of the pseudorapidity distribution and its centrality
> dependence at RHIC energies.
>
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