From: Flemming Videbaek (videbaek@sgs1.hirg.bnl.gov)
Date: Mon Jul 21 2003 - 09:40:48 EDT
FYI ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "William A. Zajc" <zajc@nevis.columbia.edu> To: "'Thomas Kirk'" <tkirk@bnl.gov>; "'Wit Busza '" <busza@mit.edu>; "'Hallman, Timothy J'" <hallman@bnl.gov>; "'Videbaek, Flemming'" <videbaek@bnl.gov> Sent: Saturday, July 19, 2003 5:15 AM Subject: New PHENIX Paper on PID spectra from 200 GeV Au-Au collisions | Dear Tom, Wit, Tim and Flemming: | | PHENIX intends to submit in one week a paper on identified particle spectra from Run-2 Au-Au collisions. This is the second of our | "archival" papers providing extensive details on a particular analysis. The data have been presented as preliminary results at many | conferences, beginning with QM02. The title and abstract are enclosed below. | | Best regards, | | Bill | | ----------------------------------------------------------------------------------------------------- | | Identified Charged Particle Spectra and Yields in Au+Au Collisions at $\snn$~=~200~GeV | | The centrality dependence of transverse momentum distributions and yields for | $\pi^{\pm}$, $K^{\pm}$, $p$ and $\pbar$ in Au+Au collisions at $\snn$~=~200~GeV | at mid-rapidity are measured by the PHENIX experiment at RHIC. We observe | a clear particle mass dependence of the shapes of transverse momentum spectra | in central collisions below $\sim$~2~GeV/$c$ in $\pt$. Both mean transverse | momenta and particle yields per participant pair increase from peripheral to | mid-central and saturate at the most central collisions for all particle species. | We also measure particle ratios of $\pi^{-}/\pi^{+}$, $K^{-}/K^{+}$, $\pbar/p$, | $K/\pi$, $p/\pi$ and $\pbar/\pi$ as a function of $\pt$ and collision centrality. | The ratios of equal mass particle yields are independent of $\pt$ and | centrality within the experimental uncertainties. In central collisions at | intermediate transverse momenta $\sim$~1.5 -- 4.5~GeV/$c$, proton and anti-proton | yields constitute a significant fraction of the charged hadron production and | show a scaling behavior different from that of pions. |
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