APEX: wear positive evidence for 800 keV sharp pairs

摘要

The APEX experiment was mounted to test EPOS' earlier observations of sharp (e~+e~-) pairs from high-Z heavy ion collisions. In a reent letter the APEX collaboration(1) presents its results, and considers the earlier EPOS U+Th results(2,3,4,5) in the light of their own new data. It asserts that their data offers no statistically significant evidencp of sharp paris and concludes "that the results of the present experiment represent a real disagreement with the previous observations".