Abstract
The transverse momentum spectra for pions observed by WA80 and NA35 collaborations are analysed within a fireball model with collective isentropic expansion and a realistic freeze-out criterion. By varing the initial state of the fireball, an excellent fit to the data is achieved for the whole measured range ofP T . Slight differences in the data for the spectral slopes from central and pheripheral collisions originate in our model from the difference in the size of the fireball and in the number of participating nucleons in central and peripheral collisions. Using additional information from two-pion correlations, we can extrapolate our model back from the freeze-out point (determined from the spectra) to the initial state; we find that an initial energy density of 1.5–2GGeV/fm3 is sufficient to explain the data from central O+Au collisions at 200A GeV.
Similar content being viewed by others
References
B. Müller: The physics of the quark-gluon plasma. Lecture Notes in Physics 225. Berlin, Heidelberg, New York: Springer 1985; Proc. 6th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter '87), H. Satz, H. Specht, (eds.), Z. Phys. C—Particles and Fields 38 (1988), and references therein
U. Heinz, K.S. Lee, M. Rhoades-Brown: Phys. Rev. Lett. 58 (1987) 2292; K.S. Lee, M. Rhoades-Brown, U. Heinz: Phys. Rev. C37 (1988) 1463
WA80 collaboration, R. Albrecht et al.: Phys. Lett B201 (1988) 390
NA35 collaboration, H. Ströbele et al.: Z. Phys. C—Particles and Fields 38 (1988) 89
J. Bondorf, S. Garpman, J. Zimanyi: Nucl. Phys. A296 (1978) 320
F. Cooper, G. Frye: Phys. Rev. D10 (1974) 186; V. Ruuskanen, Acta Phys. Pol. 18 (1987) 551
P.J. Siemens, J.O. Rasmussen: Phys. Rev. Lett. 42 (1979) 880
A.D. Jackson, H. Bøggild: Nucl. Phys. A470 (1987) 669
NA35 Coll. A. Bamberger et al.: Phys. Lett. B203 (1988) 320
WA80 Coll. R. Albrecht et al.: Transverse momentum distributions for neural pions from central and peripheral16O+Au collisions at 200A GeV, GSI preprint GSI-89-03
E. Schnedermann: Diploma thesis, University of Regensburg, in preparation
NA35 Coll. J. Harris et al.: Proceedings of the Seventh International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions-Quark Matter 1988, Lenox (Massachusetts), 1988, to appear in Nucl. Phys. A
E802 collaboration, P. Vincent et al.: Proceedings of the Seventh International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions-Quark Matter 1988, Lenox (Massachusetts), 1988, to appear in Nucl. Phys. A
U. Heinz, in: Hadronic matter in collision. J. Rafelski, P. Carruthers (eds.), Proceedings of the International Workshop on Hadronic Matter in Collision, Tucson (Arizona), 1988. Singapore: World Scientific (1989)
T.W. Atwater, P.S. Freier, J.I. Kapusta: Phys. Lett. B199 (1987) 30
L. Csernai, L. Gutay: private communication
Author information
Authors and Affiliations
Additional information
Work supported in part by Bundesministerium für Forschung and Technologie, grant MEP 0234 REA
Rights and permissions
About this article
Cite this article
Lee, K.S., Heinz, U. Collective flow model for the pion transverse momentum spectra from relativistic nuclear collisions at CERN. Z. Phys. C - Particles and Fields 43, 425–429 (1989). https://doi.org/10.1007/BF01506538
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01506538