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Observation of the antimatter helium-4 nucleus at RHIC
Published 1 Jul 2011 in nucl-ex | (1107.0108v1)
Abstract: We present the observation of the \Heebar nucleus, the heaviest antinucleus observed to date. In total, 18 \Heebar counts were detected at the STAR experiment at RHIC in 10${9}$ recorded Au+Au collisions at beam energies of $\sqrt{s_{NN}}$ = 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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