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 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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Author:Igor N. MishustinORCiDGND, Leonid M. Satarov, Horst StöckerORCiDGND, Walter GreinerGND
Document Type:Preprint
Date of Publication (online):2005/12/19
Year of first Publication:1997
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
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
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht