Intriguing Centrality Dependence of the Au-Au Source Size at the AGS
One of the main goals of high energy heavy ion physics is to establish the existence of a deconfined phase of nuclear matter — the quark-gluon plasma — at high temperatures or densities. One possible signature of such a phase transition, especially if it were first order, would be a larger source size or lifetime than a similar hadronic system. At current AGS energies, we attempt to form a quark-gluon plasma by achieving a high baryon density for a period of time in the center of the collision regioni. For a given density threshold, the size of this high density region should be a strong function of the impact parameter: the more central the event, the larger the high density region. Therefore, one possible signature of a quark-gluon plasma would be a sudden change in system lifetime or size as a function of the centrality of the collision.
KeywordsSource Size Dynamical Correlation High Density Region Pion Pair High Baryon Density
Unable to display preview. Download preview PDF.
- 1.S. Kahana et al., Searching for high baryon density at the AGS with ARC, Nucl. Phys. A566: 465c (1994).Google Scholar
- 2.U.A. Wiedemann, P. Scotto, and U. Heinz, Transverse momentum dependence of Hanbury- Brown-Twiss correlation radii, PREPRINT TPR-95–06 (1995).Google Scholar
- 3.T. Alber, Two-pion interferometry in central nucleus-nucleus collisions at the CERN SPS - results from experiments NA35 and NA49, Nucl. Phys. A590: 453c (1995).Google Scholar
- 4.B. Jacak, et al., Recent results from NA44 and a review of HBT, Nucl. Phys. A590: 215c (1995).Google Scholar
- 7.R.A. Soltz. “Two-pion Correlation Measurements for 14.6 A GeV/c Si+X and 11. 6 A GeV/c Au+Au” PhD thesis, MIT (1994).Google Scholar
- 8.B. Cole, et al., Recent results from experiment 859 at the BNL AGS, Nucl. Phys. A590: 179c (1995).Google Scholar
- 9.D. Zachary. PhD thesis, MIT (1994).Google Scholar
- 10.Fuqiang Wang. PhD thesis, Columbia U. (in preparation).Google Scholar
- 11.V. Cianciolo. “2 K+ Correlation Measurement” PhD thesis, MIT (1994).Google Scholar