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Evidence for nonhadronic degrees of freedom in the transverse mass spectra of kaons from relativistic nucleus-nucleus collisions?

  • We investigate transverse hadron spectra from relativistic nucleus-nucleus collisions which reflect important aspects of the dynamics - such as the generation of pressure - in the hot and dense zone formed in the early phase of the reaction. Our analysis is performed within two independent transport approaches (HSD and UrQMD) that are based on quark, diquark, string and hadronic degrees of freedom. Both transport models show their reliability for elementary pp as well as light-ion (C+C, Si+Si) reactions. However, for central Au+Au (Pb+Pb) collisions at bombarding energies above ~ 5 A.GeV the measured K+- transverse mass spectra have a larger inverse slope parameter than expected from the calculation. Thus the pressure generated by hadronic interactions in the transport models above ~ 5 A.GeV is lower than observed in the experimental data. This finding shows that the additional pressure - as expected from lattice QCD calculations at finite quark chemical potential and temperature - is generated by strong partonic interactions in the early phase of central Au+Au (Pb+Pb) collisions.

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Metadaten
Author:Elena L. BratkovskayaORCiDGND, Sven SoffORCiD, Horst StöckerORCiDGND, Marco van Leeuwen, Wolfgang CassingGND
URN:urn:nbn:de:hebis:30-6837
DOI:https://doi.org/10.1103/PhysRevLett.92.032302
ISSN:1079-7114
ISSN:0031-9007
Parent Title (English):Physical review letters
Publisher:American Physical Society
Place of publication:College Park, Md.
Document Type:Article
Language:English
Date of Publication (online):2005/04/13
Year of first Publication:2004
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/13
Volume:92
Issue:3, Art. 032302
Page Number:4
First Page:1
Last Page:4
Note:
©2004 American Physical Society
Source:http://de.arxiv.org/abs/nucl-th/0307098 , Phys.Rev.Lett. 92 (2004) 032302
HeBIS-PPN:128783192
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:10.00.00 THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS (for experimental methods and instrumentation for elementary-particle physics, see section 29) / 13.00.00 Specific reactions and phenomenology / 13.60.-r Photon and charged-lepton interactions with hadrons (for neutrino interactions, see 13.15.+g) / 13.60.Le Meson production
20.00.00 NUCLEAR PHYSICS / 25.00.00 Nuclear reactions: specific reactions / 25.75.-q Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions)
20.00.00 NUCLEAR PHYSICS / 25.00.00 Nuclear reactions: specific reactions / 25.75.-q Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions) / 25.75.Dw Particle and resonance production
20.00.00 NUCLEAR PHYSICS / 25.00.00 Nuclear reactions: specific reactions / 25.75.-q Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions) / 25.75.Ld Collective flow
Licence (German):License LogoDeutsches Urheberrecht