Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The pentaquark $\Theta^+(1540)$ in the string model   We consider the $\Theta^+(1540)$ pentaquark in the string model that
correctly reproduces the linear Regge trajectories for the case of orbital
excitations of light $q\bar q$ mesons and $qqq$ baryons. Assuming (and arguing
in favour of) the diquark-antiquark-diquark ($[ud]\bar s [ud]$) clustering of
this orbitally excited object we found its mass about $290 \rm {MeV}$ above the
experimental value $1540 \rm {MeV}$. In the model considered this discrepancy
could be attributed to the change of the constituent mass of $\bar s$ antiquark
as compared to that of $s$ quark localized at the string end.

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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: math
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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: adap-org
10
The categories of this paper are: q-bio