Observation of the antimatter helium-4 nucleus at RHIC
Abstract
We present the observation of the nucleus, the heaviest antinucleus observed to date. In total, 18 counts were detected at the STAR experiment at RHIC in 109 recorded Au+Au collisions at beam energies of sNN = 200 GeV and 62 GeV. The background has been estimated, and the misidentification probability is found to be lower than 10-11.
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