Journal
SCIENCE
Volume 328, Issue 5974, Pages 58-62Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1183980
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Funding
- U.S. DOE Office of Science
- NSF
- Sloan Foundation
- DFG cluster of excellence Origin and Structure of the Universe [CNRS/IN2P3]
- STFC
- EPSRC of the United Kingdom
- FAPESP CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC of China
- CAS of China
- MoST of China
- MoE of China
- GA of the Czech Republic
- MSMT of the Czech Republic
- FOM of the Netherlands
- NOW of the Netherlands
- DAE of India
- DST of India
- CSIR of India
- Polish Ministry of Science and Higher Education
- Korea Research Foundation
- Ministry of Science, Education and Sports of the Republic of Croatia
- Russian Ministry of Science and Technology and RosAtom of Russia
- STFC [PP/F001061/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F001061/1] Funding Source: researchfish
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Nuclear collisions recreate conditions in the universe microseconds after the Big Bang. Only a very small fraction of the emitted fragments are light nuclei, but these states are of fundamental interest. We report the observation of antihypertritons-comprising an antiproton, an antineutron, and an antilambda hyperon-produced by colliding gold nuclei at high energy. Our analysis yields 70 +/- 17 antihypertritons (3/Lambda(H) over bar) and 157 +/- 30 hypertritons (H-3(Lambda)). The measured yields of H-3(Lambda) (3/Lambda(H) over bar) and He-3 ((3)(He) over bar) are similar, suggesting an equilibrium in coordinate and momentum space populations of up, down, and strange quarks and antiquarks, unlike the pattern observed at lower collision energies. The production and properties of antinuclei, and of nuclei containing strange quarks, have implications spanning nuclear and particle physics, astrophysics, and cosmology.
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