Energy and centrality dependence of deuteron and proton production in Pb+Pb collisions at relativistic energies

The transverse mass mt distributions for deuterons and protons are measured in Pb+Pb reactions near midrapidity and in the range 0<mt–m<1.0 (1.5) GeV/c2 for minimum bias collisions at 158A GeV and for central collisions 
The transverse mass mt distributions for deuterons and protons are measured in Pb+Pb reactions near midrapidity and in the range 0<mt–m<1.0 (1.5) GeV/c2 for minimum bias collisions at 158A GeV and for central collisions at 40 and 80 A GeV beam energies. The rapidity density dn/dy, inverse slope parameter T and mean transverse mass <mt> derived from mt distributions as well as the coalescence parameter B2 are studied as a function of the incident energy and the collision centrality. The deuteron mt spectra are significantly harder than those of protons, especially in central collisions. The coalescence factor B2 shows three systematic trends. First, it decreases strongly with increasing centrality reflecting an enlargement of the deuteron coalescence volume in central Pb+Pb collisions. Second, it increases with mt. Finally, B2 shows an increase with decreasing incident beam energy even within the SPS energy range. The results are discussed and compared to the predictions of models that include the collective expansion of the source created in Pb+Pb collisions.
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Metadaten
Author:T. Anticic, L. Betev, Anja Billmeier, Roland Bramm, Peter Dinkelaker, Marek Gazdzicki, Thorsten Kollegger, Christine Meurer, Michael Kosta Mitrovski, R. Renfordt, Reinhard Stock, Herbert Ströbele, Alexander Albert Wetzler, Jacek Zaranek, et al., NA49 Collaboration
URN:urn:nbn:de:hebis:30-16264
Document Type:Article
Language:English
Date of Publication (online):2005/09/26
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/09/26
Source:Published in Phys.Rev.C69:024902,2004, ©2004 The American Physical Society, http://link.aps.org/abstract/PRC/v69/p024902
HeBIS PPN:191510963
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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