Antimatter H-4(Lambda) hypernucleus production and the H-3(Lambda)/He-3 puzzle in relativistic heavy-ion collisions

作者：Sun, Kai-Jia; Chen, Lie-Wen^*

来源：PHYSICAL REVIEW C, 2016, 93(6): 064909.

DOI：10.1103/PhysRevC.93.064909

• PLUS AU COLLISIONS
• LIGHT HYPERNUCLEI
• COALESCENCE MODEL
• FREEZE-OUT
• STRANGENESS
• NUCLEI
• HADRONS

We show that the measured yield ratio H-3(Lambda)/He-3 (3/Lambda(H) over bar/(3)(H) over bare) in Au + Au collisions at root s(NN) = 200 GeV and in Pb + Pb collisions at root s(NN) = 2.76 TeV can be understood within a covariant coalescence model if (anti-)Lambda particles freeze out earlier than (anti-) nucleons but their relative freeze-out time is closer at root s(NN) = 2.76 TeV than at root s(NN) = 200 GeV. The earlier (anti-)Lambda freeze-out can significantly enhance the yield of (anti) hypernucleus H-4(Lambda) (4/Lambda(H) over bar), leading to that 4/Lambda(H) over bar has a comparable abundance with (4)(He) over bar and thus provides an easily measured antimatter candidate heavier than (4)(He) over bar. The future measurement on H-4(Lambda) (4/Lambda(H) over bar) would be very useful to understand the (anti-)Lambda freeze-out dynamics and the production mechanism of (anti) hypernuclei in relativistic heavy-ion collisions.

• 出版日期2016-6-29
• 单位上海交通大学