Observation of an Antimatter Hypernucleus
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1003.2030.pdf
Description
Accepted version
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1.15 MB
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Author(s)
The STAR Collaboration
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Hoffman, A. M.
Jones, C. L.
Kocoloski, Adam Philip
Leight, William Axel
Milner, Richard G
Date Issued
2010
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Abelev, B. I., et al. "Observation of an Antimatter Hypernucleus." Science 328 5974 (2010): 58-62.
Version
Author's final manuscript
Abstract
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/ΛH̄) and 157 ± 30 hypertritons (3/ΛH̄ The measured yields of 3/ΛH (3/ΛH) and 3He (3He) 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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/science.1183980
