Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The pp->K+ n Sigma+ reaction near threshold   Inclusive K+ production in proton-proton collisions has been measured at a
beam energy of 2.16 GeV using the COSY-ANKE magnetic spectrometer. The
resulting spectrum, as well as those corresponding to K+ p and K+ pi+
correlated pairs, can all be well described using consistent values of the
total cross sections for the pp->K+ p Lambda, pp->K+ p Sigma0, and pp->K+ n
Sigma+ reactions. While the resulting values for Lambda and Sigma0 production
are in good agreement with world data, our value for the total Sigma+
production cross section, sigma(pp->K+ n Sigma+) = 2.5+/-0.6(stat)+/-0.4(syst)
mkb at an excess energy of epsilon=129 MeV, could only be reconciled with other
recently published data if there were a highly unusual near--threshold
behaviour.

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The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg