一个反物质超核的观测
Observation of an Antimatter Hypernucleus
摘要：
核碰撞在宇宙大爆炸后的几微秒内重现了宇宙的状况。只有非常小的一部分发射碎片是轻核，但这些状态是基本的兴趣。我们报告的观察antihypertritons -由一个反质子，反中子，和antilambda超子-产生的碰撞金核在高能量。我们的分析产生70 +-17 antihypertritons和157 +-30 hypertritons。测得的超超夸克（反超夸克）和氦3（反氦3）的产率是相似的，这表明在坐标和动量空间中，上、下和奇怪的夸克和反夸克的数量是平衡的，这与在较低的碰撞能量下观察到的模式不同。反核和含有奇异夸克的原子核的产生和性质涉及核/粒子物理学、天体物理学和宇宙学。
英文摘要：
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.
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