Journalartikel

Differential flow of protons in Au plus Au collisions at AGS energies


AutorenlisteSahu, PK; Cassing, W

Jahr der Veröffentlichung2002

Seiten357-369

ZeitschriftNuclear Physics A: Nuclear and Hadronic Physics

Bandnummer712

Heftnummer3-4

ISSN0375-9474

eISSN1873-1554

Open Access StatusGreen

DOI Linkhttps://doi.org/10.1016/S0375-9474(02)01287-3

VerlagElsevier


Abstract
We study the proton sideward and elliptic differential flow for Au + An collisions at AGS energies (2-8 A GeV) in a microscopic relativistic transport model that includes all baryon resonances up to a mass of 2 GeV as well as string degrees of freedom for the higher hadronic excitations. In order to explore the sensitivity of the various differential flows to the nuclear equation of state (EoS) we use three different parameterizations of the scalar and vector mean-fields, i.e., NL2 (soft), NL23 (medium) and NU (hard), with their momentum dependence fitted to the experimental Schrodinger equivalent potential (at normal nuclear matter density rho(0)) up to kinetic energies of 1 GeV. We calculate the excitation function of sideward and elliptic flow within. these parameter sets for An + Au collisions and compare with the recent data from the E895 Collaboration as a function of rapidity, impact parameter and transverse momentum, respectively. We find that the best description of the differential data is provided by a rather 'stiff' EoS at 2 A GeV (NL3) while at higher bombarding energies (4-8 A GeV) a 'medium' EoS leads to the lowest chi(2) with respect to the data. However, the differences in the transverse and elliptic flows (from the different parameter sets) become of minor significance at 4-8 A GeV. We attribute this insensitivity to a similar reduction of the vector potential in all models and to the dominance of string degrees of freedom at these bombarding energies. (C) 2002 Elsevier Science B.V. All rights reserved.



Zitierstile

Harvard-ZitierstilSahu, P. and Cassing, W. (2002) Differential flow of protons in Au plus Au collisions at AGS energies, Nuclear Physics A: Nuclear and Hadronic Physics, 712(3-4), Article PII S0375-9474(02)01287-3. pp. 357-369. https://doi.org/10.1016/S0375-9474(02)01287-3

APA-ZitierstilSahu, P., & Cassing, W. (2002). Differential flow of protons in Au plus Au collisions at AGS energies. Nuclear Physics A: Nuclear and Hadronic Physics. 712(3-4), Article PII S0375-9474(02)01287-3, 357-369. https://doi.org/10.1016/S0375-9474(02)01287-3



Schlagwörter


BARYON FLOWCOLLECTIVE FLOWELLIPTIC FLOWEQUATION-OF-STATEHEAVY-ION COLLISIONSHOTNUCLEAR-EQUATIONrelativistic heavy-ion collisionsrelativistic modelsSIDEWARD FLOWSIGNATURESISTRANSPORT APPROACH


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