dorsal/arxiv
View SchemaScaling of particle production with number of participants in high-energy A+A collisions in the parton-cascade model
| Authors | Dinesh K. Srivastava, Klaus Geiger |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9808042 |
| URL | https://arxiv.org/abs/nucl-th/9808042 |
Abstract
In view of the recent WA98 data of pi0 spectra from central Pb+Pb collisions at the CERN SPS, we analyze the production of neutral pions for A+$ collisions across the periodic table at sqrt(s)=17 AGeV and 200 AGeV within the framework of the parton-cascade model for relativistic heavy ion collisions. The multiplicity of the pions (having pT > 0.5 GeV/c) in the central rapidity region, is seen to scale as \sim (N_part)^alpha, where N_part$ is the number of participating nucleons, which we have approximated as 2A for central collisions of identical nuclei. We argue that the deviation of \alpha (\simeq 1.2) from unity may have its origin in the multiple scattering suffered by the partons. We also find that the constant of proportionality in the above scaling relation increases substantially in going from SPS to RHIC energies. This would imply that the (semi)hard partonic activity becomes a much cleaner signal above the soft particle production at the higher energy of RHIC, and thus much less dependent on the (lack of) understanding of the underlying soft physics background.
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"abstract": "In view of the recent WA98 data of pi0 spectra from central Pb+Pb collisions\nat the CERN SPS, we analyze the production of neutral pions for A+$ collisions\nacross the periodic table at sqrt(s)=17 AGeV and 200 AGeV within the framework\nof the parton-cascade model for relativistic heavy ion collisions. The\nmultiplicity of the pions (having pT \u003e 0.5 GeV/c) in the central rapidity\nregion, is seen to scale as \\sim (N_part)^alpha, where N_part$ is the number of\nparticipating nucleons, which we have approximated as 2A for central collisions\nof identical nuclei. We argue that the deviation of \\alpha (\\simeq 1.2) from\nunity may have its origin in the multiple scattering suffered by the partons.\nWe also find that the constant of proportionality in the above scaling relation\nincreases substantially in going from SPS to RHIC energies. This would imply\nthat the (semi)hard partonic activity becomes a much cleaner signal above the\nsoft particle production at the higher energy of RHIC, and thus much less\ndependent on the (lack of) understanding of the underlying soft physics\nbackground.",
"arxiv_id": "nucl-th/9808042",
"authors": [
"Dinesh K. Srivastava",
"Klaus Geiger"
],
"categories": [
"nucl-th"
],
"title": "Scaling of particle production with number of participants in high-energy A+A collisions in the parton-cascade model",
"url": "https://arxiv.org/abs/nucl-th/9808042"
},
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