FYI ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 > Dear Tom, Bill, John and Flemming, > In a week's time the Phobos collaboration plans to submit a new paper to > PRC Rapid Communications. > The title and abstract are as follows: > > Title: > "Centrality Dependence of the Charged Particle Multiplicity > near Mid-Rapidity in Au+Au Collisions at sqrt(s_NN) = 130 and 200 GeV" > Abstract: > The PHOBOS experiment has measured the charged particle > multiplicity at mid-rapidity in Au+Au collisions at > sqrt(s_NN) = 200 GeV as a function of the collision centrality. > Results on dN/deta(eta<1) divided by the number of participating > nucleon pairs, <Npart/2>, are presented as a function of <Npart>. > As was found from similar data at sqrt(s_NN) = 130 GeV, the data can > be equally well described by parton saturation models and two- > component fits which include contributions that scale as Npart and > the number of binary collisions Ncoll. We compare the data at the > two energies by means of the ratio R(200/130) of the charged particle > multiplicity for the two different energies as a function of <Npart> > For events with <Npart>>100$, we find that this ratio is consistent > with a constant value of 1.14+-0.01(stat.)+-0.05(syst.). > > We would appreciate any comments that you may have. > > All the best, > Wit > > > >
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