Hyper-Nuclei 4ΛHe Production in sNN = 3 GeV Au+Au collisions at RHIC
Abstract
The STAR experiment reports the first measurement of the 4ΛHe hyper-nuclei yield as a function of rapidity and transverse momentum in 0-50% central Au+Au collisions at sNN = 3 GeV. The 4ΛHe is reconstructed through its three-body decay channel, 4ΛHe → 3He + p + π-, with a statistical significance of about 9.5 standard deviations. We find that the yield of 4ΛHe as a function of rapidity is consistent with that of 4ΛH, and the rapidity-dependent yield ratio of 4ΛHe/4ΛH is consistent with that of 3He/t. All the measurements, as well as the transverse-momentum spectra, can be reasonably described by the JAM with a coalescence afterburner, suggesting a coalescence-based formation scenario for hyper-nuclei at this energy. The canonical thermal model reproduces the observed yield ratios but overpredicts the absolute hyper-nuclei yields.
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