Science, Vol.328, No.5974, 58-62, 2010
Observation of an Antimatter Hypernucleus
Abelev BI ,
Aggarwal MM ,
Ahammed Z ,
Alakhverdyants AV ,
Alekseev I ,
Anderson BD ,
Arkhipkin D ,
Averichev GS ,
Balewski J ,
Barnby LS ,
Baumgart S ,
Beavis DR ,
Bellwied R ,
Betancourt MJ ,
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Brandin AV ,
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Bueltmann S ,
Bunzarov I ,
Burton TP ,
Cai XZ ,
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Cervantes MC ,
Chajecki Z ,
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Chattopadhyay S ,
Chen HF ,
Chen JH ,
Chen JY ,
Cheng J ,
Cherney M ,
Chikanian A ,
Choi KE ,
Christie W ,
Chung P ,
Clarke RF ,
Codrington MJM ,
Corliss R ,
Cramer JG ,
Crawford HJ ,
Das D ,
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Leyva AD ,
De Silva LC ,
Debbe RR ,
Dedovich TG ,
DePhillips M ,
Derevschikov AA ,
de Souza RD ,
Didenko L ,
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Dogra SM ,
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Lindenbaum SJ ,
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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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