Speaker
Description
The hypertriton was first discovered in 1952 by Marion Danysz and Jerzy Pniewski [1] using a balloon-flown emulsion plate exposed to high-energy cosmic rays and was later studied through the interaction of stopping negative kaons in a helium bubble chamber [2]. It is now known that the Λ hyperon in a hypertriton has a separation energy of only about 130 keV and a spatial separation of roughly 10 fm from the proton and neutron, making it resemble a nucleus with a Λ halo. More recently, both hypertriton and anti-hypertriton have been observed in relativistic heavy-ion collisions at RHIC [3] and the LHC [4]. Their measured yields can be well described by the coalescence model, which is based on the recombination of Λ hyperons and nucleons at kinetic freeze-out [5]. This offers a promising avenue for probing the Λ-nucleon interaction [6]. This talk will review the status of (anti-)hypertriton studies in heavy ion collisions and discuss their implications for understanding the spin structure of (anti-)hypertriton, Λ-nucleon interaction, and the properties of nuclear stars.
[1] M. Danysz and J. Pniewski, Philos. Mag. 44, 138 (1953).
[2] D. H. Davis, et al., Part. Fields 43, 38 (1991).
[3] STAR Collaboration, Phys. Rev. C 97, 054909 (2018).
[4] ALICE Collaboration, Phys. Lett. B 754, 360 (2016).
[5] K. J. Sun, C. M. Ko, and B. Donigus, Phys. Lett. B 792, 132 (2019).
[6] Y. G. Ma, Nucl. Sci. Tech. 34, 97 (2023).
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