Abstract
Measurements of the midrapidity transverse-energy distribution, , are presented for , , and collisions at GeV and additionally for collisions at and 130 GeV. The distributions are first compared with the number of nucleon participants , number of binary collisions , and number of constituent-quark participants calculated from a Glauber model based on the nuclear geometry. For , increases with , while is approximately constant for all three energies. This indicates that the two-component ansatz, , which was used to represent distributions, is simply a proxy for , and that the term does not represent a hard-scattering component in distributions. The distributions of and are then calculated from the measured distribution using two models that both reproduce the data. However, while the number-of-constituent-quark-participant model agrees well with the data, the additive-quark model does not.
12 More- Received 24 December 2013
DOI:https://doi.org/10.1103/PhysRevC.89.044905
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