Hello Steve I think your abstract is fine. I was wondering whether one could broaden the scope a bit by pulling in the ratios story, which seems to suggest a plateau at midrapidity. This may or may not have anything to do with limiting particle production. Also we should have p+p data available by that time, so that you may attempt a more general description of multiplicities also based on individual species. cheers JJ ____________________________________________________________ Jens Jørgen Gaardhøje, Assoc. Prof., Dr. Sc. Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen, Denmark. Tlf: (+45) 35 32 53 09, secr. (+45) 35 32 52 09, Fax: (+45) 35 32 50 16. UNESCO Natl. Comm., secr. (+45) 33 92 52 16. Email: gardhoje@nbi.dk. ____________________________________________________________ ----- Original Message ----- From: "Stephen J. Sanders" <ssanders@ku.edu> To: <brahms-l@bnl.gov> Sent: Thursday, June 27, 2002 10:56 PM Subject: Draft Abstract for Fall DNP Meeting (Michigan State University) > Hi, > Below is a draft abstract that I would like to submit to the mini-symposium > on "Gluon Saturation at RHIC" at the Fall DNP meeting. The > abstract deadline is Monday so please send comments and corrections before > then. Thanks. > > ...steve > > > > ABSTRACT: > Charged-Particle Pseudorapidity Densities at BRAHMS > > S.J. Sanders for the BRAHMS Collaboration > > One of the suggested signatures for a saturation of the number of parton > collisions in central nucleus-nucleus collisions at higher energies is a > limit on the production of charged particles [1-3]. The BRAHMS experiment > has measured charged-particle pseudorapidity densities as a function > collision centrality at sqrt[s_nn]=130 GeV [4] and 200 GeV [5] for the > pseudorapidity range of 4.7<=eta<=4.7. Close to beam rapidity, the > pseudorapidity densities at the two energies scale in a manner consistent > with a limiting fragmentation picture in which the excitations of the > fragment baryons saturate at a moderate collision energy, independent of > system size. At mid-rapidity for the 5% most central events we find a 14% > increase in pseudorapidity density at sqrt[s_nn]=200 GeV relative to > sqrt[s_nn]=130 GeV. The calculations of Kharzeev and Levin [3], which > include gluon saturation effects, are in reasonable agreement with this > result. We note, however, that an alternative calculation [6] gives > comparably good results without including saturation effects. This talk > will present the BRAHMS results at the two RHIC energies in the context of > current models. Data on p+p scattering at the highest RHIC energy will also > be presented. > > > > [1] L.V. Gribov, E.M Levin and M.G. Ryskin, Phys. Rep. 100, 1(1983). > [2] K.J. Eskola, K. Kajantie and K. Tuominen, Phys. Lett. B497, 39(2001). > [3] D. Kharzeev and E. Levin, Phys. Lett. B 523, 79(2001). > [4] I.G. Bearden et al., Phys. Lett. B523, 227(2001). > [5] I.G. Bearden et al., Phys. Rev. Lett. (2002). > [6] Zi-Wei Lin et al., Phys. Rev. C 64, 011902R(2001); and Zi-wei Lin, > private communication. > > >
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