R_{out}/R_{sid} and Opacity at RHIC
Nuclear Theory
2007-05-23 v6 High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
One of the most dramatic results from the first RHIC run are the STAR results for pi+- pi+- interferometry. They showed that the ratio of the so-called R_{out} and R_{sid} radii seem to decrease below unity for increasing transverse momentum of the pair (K_T). This was subsequently confirmed by PHENIX, which also extended the K_T range of the measurements. We consider here the effects of opacity of the nuclei on this ratio, and find that such a small value is consistent with surface emission from an opaque source.
Cite
@article{arxiv.nucl-th/0205028,
title = {R_{out}/R_{sid} and Opacity at RHIC},
author = {Larry McLerran and Sandra S. Padula},
journal= {arXiv preprint arXiv:nucl-th/0205028},
year = {2007}
}
Comments
24 pages, 8 Postscript figures; factor corrected in Eq.(15)