Dilepton production by bremsstrahlung of meson fields in nuclear collisions

We study the bremsstrahlung of virtual omega mesons due to the collective deceleration of nuclei at the initial stage of an ultrarelativistic heavy ion collision. It is shown that electromagnetic decays of these mesons m
We study the bremsstrahlung of virtual omega mesons due to the collective deceleration of nuclei at the initial stage of an ultrarelativistic heavy ion collision. It is shown that electromagnetic decays of these mesons may give an important contribution to the observed yields of dileptons. Mass spectra of e+e and µ+µ pairs produced in central Au+Au collisions are calculated under some simplifying assumptions on the space time variation of the baryonic current in a nuclear collision process. Comparison with the CERES data for 160 AGev Pb+Au collisions shows that the proposed mechanism gives a noticeable fraction of the observed e+e pairs in the intermediate region of invariant masses. Sensi tivity of the dilepton yield to the in medium modification of masses and widths of vector mesons is demonstrated.
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Metadaten
Author:Igor N. Mishustin, Leonid M. Satarov, Horst Stöcker, Walter Greiner
URN:urn:nbn:de:hebis:30-23323
Document Type:Preprint
Language:English
Date of Publication (online):2005/12/19
Year of first Publication:1997
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/12/19
Tag:Bremsstrahlung ; Kollisionen schwerer Ionen ; Meson
bremsstrahlung ; heavy ion collision ; meson
Source:Phys.Rev.C57:2552-2558,1998, http://arxiv.org/abs/hep-ph/9709384
HeBIS PPN:185296378
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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