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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 544642.0, MPI für Physik / MPI für Physik
Observation of an Antimatter Hypernucleus
Authors:STAR Collaboration; Abelev, B. I.; Schmitz, N.; Seyboth, P.; Simon, F.; et al.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Science Magazine
Journal Abbrev.:Science
Issue / Number:328
Start Page:58
End Page:62
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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 - composed of an antiproton, antineutron, and antilambda hyperon - produced by colliding gold nuclei at high energy. Our analysis yields 70 +- 17 antihypertritons and 157 +- 30 hypertritons. The measured yields of hypertriton (antihypertriton) and helium3 (antihelium3) 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 nuclei containing strange quarks, have implications spanning nuclear/particle physics, astrophysics, and cosmology.
Classification / Thesaurus:STAR
Comment of the Author/Creator:20 pages, 5 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2010-241
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/arxiv:1003.2030
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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