Rout/Rsid and Opacity at RHIC
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 Rout and Rsid radii seem to decrease below unity for increasing transverse momentum of the pair (KT). This was subsequently confirmed by PHENIX, which also extended the KT 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.
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