Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved Tests of Relations for Baryon Isomultiplet Splittings   The least well-known octet baryon mass is $M_{\Xi^0} = 1314.9 \pm 0.6$ MeV.
The prospect of an improved measurement of its mass by the KTeV experimental
program at Fermilab, and opportunities for improvements in charged and excited
hyperon and $\Delta$ mass measurements, makes it timely to re-examine
descriptions of isospin splittings in baryons containing light quarks. It is
possible by examining such relations as the Coleman-Glashow relation $M_n - M_p
+ M_{\Xi^-} - M_{\Xi^0} = M_{\Sigma^-} - M_{\Sigma^+}$ to distinguish between
those models making use of one- or two-body effects involving quarks and those
involving genuine three-body effects. A hierarchy based on an expansion in
$1/N_c$, where $N_c$ is the number of quark colors, is useful in this respect.
The present status of other quark-model mass relations involving $\Lambda -
\Sigma^0$ mixing and the baryon decuplet is also noted, and the degree to which
one can determine parameters such as quark mass differences and individual
electromagnetic contributions to splittings is discussed.

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The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
1
The categories of this paper are: cs
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex