From: Flemming Videbaek (videbaek@sgs1.hirg.bnl.gov)
Date: Thu Jan 16 2003 - 17:13:55 EST
FYI Another not unexpected Phobos paper - what about the participant energy loss in AA not beeing the full beam energy ?? This seems not to be considered. Flemming ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "Wit Busza" <busza@MIT.EDU> To: <tkirk@bnl.gov> Cc: <hallman@bnl.gov>; <videbaek@bnl.gov>; <zajc@columbia.edu> Sent: Thursday, January 16, 2003 10:47 AM Subject: Phobos paper on comparison with e+e- multiplicity | Dear Tom, | In a week's time the Phobos collaboration is planning to submit the | following paper to PRL: | | | Title: Comparison of the Total Charged-Particle Multiplicity in | High-Energy Heavy Ion Collisions with e+e- and pp/pbar-p Data. | | Abstract: | The PHOBOS experiment at RHIC has measured the total multiplicity of | primary charged particles as a function of collision centrality | in Au+Au collisions at sqrt(s_NN) = 19.6, 130 and 200 GeV. | Above sqrt(s)~20 GeV, the total multiplicity per participating | nucleon pair (<Nch>/(<Npart>/2)) in central events scales with sqrt(s) | in the same way as <Nch> in e+e- data. This is suggestive of a universal | mechanism of particle production in strongly-interacting systems, controlled | mainly by the amount of energy available for particle production (per | participant pair for heavy ion collisions). The same effect has been | observed in pp/pbar-p data after correcting for the energy taken away | by leading | particles. An approximate independence of <Nch>/(<Npart>/2) on the number of | participating nucleons is also observed, reminiscent of ``wounded nucleon'' | scaling (<Nch> proportional to <Npart>), but with the constant of | proportionality set by the multiplicity measured in e+e- data rather | than by pp/pbar-p data. | | | The results in this paper are essentially the same as those shown by | Peter Steinberg at QM2002. | | All the best, | Wit
This archive was generated by hypermail 2.1.5 : Thu Jan 16 2003 - 17:10:14 EST