Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb   Results on the production of the double-strange cascade hyperon
$\mathrm{\Xi^-}$ are reported for collisions of p\,(3.5~GeV)\,+\,Nb, studied
with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI
Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time,
subthreshold $\mathrm{\Xi^-}$ production is observed in proton-nucleus
interactions. Assuming a $\mathrm{\Xi^-}$ phase-space distribution similar to
that of $\mathrm{\Lambda}$ hyperons, the production probability amounts to
$P_{\mathrm{\Xi^-}}=(2.0\,\pm0.4\,\mathrm{(stat)}\,\pm
0.3\,\mathrm{(norm)}\,\pm 0.6\,\mathrm{(syst)})\times10^{-4}$ resulting in a
$\mathrm{\Xi^-/(\Lambda+\Sigma^0)}$ ratio of $P_{\mathrm{\Xi^-}}/\
P_{\mathrm{\Lambda+\Sigma^0}}=(1.2\pm
0.3\,\mathrm{(stat)}\pm0.4\,\mathrm{(syst)})\times10^{-2}$. Available model
predictions are significantly lower than the estimated $\mathrm{\Xi^-}$ yield.

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The categories of this paper are: funct-an
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin