Observation of the antimatter helium-4 nucleus at RHIC
Liang Xue
TL;DR
This paper reports the first observation of the antimatter helium-4 nucleus ( extsuperscript{4}Hē) at RHIC, with 18 counts detected, demonstrating the production of heavy antinuclei in high-energy collisions.
Contribution
It provides the first experimental evidence of the antimatter helium-4 nucleus in relativistic heavy-ion collisions.
Findings
18 extsuperscript{4}Hē nuclei detected
Misidentification probability below 10^{-11}
Observation at two different beam energies
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 recorded Au+Au collisions at beam energies of = 200 GeV and 62 GeV. The background has been estimated, and the misidentification probability is found to be lower than 10.
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