Journal article

Publication year: 2004

Journal: Physical Review Letters

Volume number: 92

Issue number: 3

ISSN: 0031-9007

eISSN: 1079-7114

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevLett.92.032302

Publisher: American Physical Society

Abstract: 
We investigate transverse hadron spectra from relativistic nucleus-nucleus collisions within two independent transport approaches 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 above similar to5A 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 similar to5A 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.

Harvard Citation style: Bratkovskaya, E., Soff, S., Stöcker, H., van Leeuwen, M. and Cassing, W. (2004) Evidence for nonhadronic degrees of freedom in the transverse mass spectra of kaons from relativistic nucleus-nucleus collisions? -: art. no. 032302, Physical Review Letters, 92(3), Article 032302. https://doi.org/10.1103/PhysRevLett.92.032302

APA Citation style: Bratkovskaya, E., Soff, S., Stöcker, H., van Leeuwen, M., & Cassing, W. (2004). Evidence for nonhadronic degrees of freedom in the transverse mass spectra of kaons from relativistic nucleus-nucleus collisions? -: art. no. 032302. Physical Review Letters. 92(3), Article 032302. https://doi.org/10.1103/PhysRevLett.92.032302