Author/Authors :
A.D. Frawley، نويسنده , , PHENIX Collaboration، نويسنده ,
Abstract :
PHENIX has studied image production in image collisions of image, d+Au, Au+Au and Cu+Cu collisions. This systematic study was designed to allow the extraction of hot nuclear matter effects on image production in heavy ion collisions after accounting for the baseline production cross section using image data, and for cold nuclear matter effects using d+Au data. Cold nuclear matter effects, for example gluon shadowing, are the effects associated with production of image from a nuclear target. The large yields obtained in the RHIC 2008 d+Au run provide, for the first time, an opportunity to characterize cold nuclear matter effects at RHIC, and try to isolate hot nuclear matter effects in Au+Au collisions. Low statistics preliminary measurements of excited charmonium yields and image yields exist so far for image collisions, and there are preliminary results for ϒ production in d+Au collisions.