dorsal/arxiv
View SchemaCoalescence and flow in ultra-relativistic heavy ion collisions
| Authors | Ruediger Scheibl, Ulrich Heinz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9809092 |
| URL | https://arxiv.org/abs/nucl-th/9809092 |
| DOI | 10.1103/PhysRevC.59.1585 |
| Journal | Phys.Rev.C59:1585-1602,1999 |
Abstract
Using a density matrix approach to describe the process of coalescence, we calculate the coalescence probabilities and invariant momentum spectra for deuterons and antideuterons. We evaluate our expressions with a hydrodynamically motivated parametrization for the source at freeze-out which implements rapid collective expansion of the collision zone formed in heavy ion collisions. We find that the coalescence process is governed by the same lengths of homogeneity which can be extracted from HBT interferometry. They appear in the absolute cluster yield via an effective volume factor as well as in a quantum mechanical correction factor which accounts for the internal structure of the deuteron cluster. Our analysis provides a new interpretation for the parameters in the popular phenomenological coalescence model and for the effective overlap volume in Hagedorn's model for cluster production in pp collisions. Using source parameters extracted from a recent HBT analysis of two-pion correlations, we successfully describe deuteron and antideuteron production data from Pb+Pb collisions at the CERN SPS as measured by the NA44 and NA52 collaborations. We also confirm the recent finding by Polleri et al. that the different measured slopes of nucleon and deuteron transverse mass spectra require a transverse density profile of the source which is closer to a box than to a Gaussian shape.
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"abstract": "Using a density matrix approach to describe the process of coalescence, we\ncalculate the coalescence probabilities and invariant momentum spectra for\ndeuterons and antideuterons. We evaluate our expressions with a\nhydrodynamically motivated parametrization for the source at freeze-out which\nimplements rapid collective expansion of the collision zone formed in heavy ion\ncollisions. We find that the coalescence process is governed by the same\nlengths of homogeneity which can be extracted from HBT interferometry. They\nappear in the absolute cluster yield via an effective volume factor as well as\nin a quantum mechanical correction factor which accounts for the internal\nstructure of the deuteron cluster. Our analysis provides a new interpretation\nfor the parameters in the popular phenomenological coalescence model and for\nthe effective overlap volume in Hagedorn\u0027s model for cluster production in pp\ncollisions. Using source parameters extracted from a recent HBT analysis of\ntwo-pion correlations, we successfully describe deuteron and antideuteron\nproduction data from Pb+Pb collisions at the CERN SPS as measured by the NA44\nand NA52 collaborations. We also confirm the recent finding by Polleri et al.\nthat the different measured slopes of nucleon and deuteron transverse mass\nspectra require a transverse density profile of the source which is closer to a\nbox than to a Gaussian shape.",
"arxiv_id": "nucl-th/9809092",
"authors": [
"Ruediger Scheibl",
"Ulrich Heinz"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.59.1585",
"journal_ref": "Phys.Rev.C59:1585-1602,1999",
"title": "Coalescence and flow in ultra-relativistic heavy ion collisions",
"url": "https://arxiv.org/abs/nucl-th/9809092"
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