Transverse-energy distributions at midrapidity in p+p , d+Au , and Au+Au collisions at $\sqrt{s_{NN}}=62.4–200$ GeV and implications for particle-production models

Measurements of the midrapidity transverse-energy distribution, dET/dη, are presented for p+p, d+Au, and Au+Au collisions at sNN=200 GeV and additionally for Au+Au collisions at sNN=62.4 and 130 GeV. The dET/dη distributions are first compared with the number of nucleon participants Npart, number of binary collisions Ncoll, and number of constituent-quark participants Nqp calculated from a Glauber model based on the nuclear geometry. For Au+Au, 〈dET/dη〉/Npart increases with Npart, while 〈dET/dη〉/Nqp is approximately constant for all three energies. This indicates that the two-component ansatz, dET/dη∝(1−x)Npart/2+xNcoll, which was used to represent ET distributions, is simply a proxy for Nqp, and that the Ncoll term does not represent a hard-scattering component in ET distributions. The dET/dη distributions of Au+Au and d+Au are then calculated from the measured p+p ET distribution using two models that both reproduce the Au+Au data. However, while the number-of-constituent-quark-participant model agrees well with the d+Au data, the additive-quark model does not.

Note:

391 authors, 24 pages, 19 figures, and 15 Tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/papers.html

25.75.Dw
model: Glauber
transverse energy: energy spectrum
hard scattering
nucleon nucleon: interaction
p p: interaction
heavy ion: scattering
deuteron
gold
rapidity: central region

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Transverse-energy distributions at midrapidity in p+p , d+Au , and Au+Au collisions at sNN=62.4–200\sqrt{s_{NN}}=62.4–200sNN​​=62.4–200 GeV and implications for particle-production models

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Transverse-energy distributions at midrapidity in p+p , d+Au , and Au+Au collisions at $\sqrt{s_{NN}}=62.4–200$ GeV and implications for particle-production models