Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of an Antimatter Hypernucleus   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.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci