Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tetraquark spectroscopy   A complete classification of $qq \bar q \bar q$ tetraquark states in terms of
the spin-flavour, colour and spatial degrees of freedom has been constructed.
The permutational symmetry properties of both the spin-flavour and orbital
parts of the $qq$ and $\bar{q}\bar{q}$ subsystems are discussed. This complete
classification is general and model independent and it is useful both for model
builders and experimentalists. The total wave functions are also explicitly
constructed in the hypothesis of ideal mixing; this basis for tetraquark states
will enable the eigenvalue problem to be solved for a definite dynamical model.
An evaluation of the tetraquark spectrum is obtained from the Iachello mass
formula for normal mesons, here generalized to tetraquark systems. This mass
formula is a generalization of the Gell-Mann Okubo mass formula, whose
coefficients have been upgraded by a study of the latest PDG data. The ground
state tetraquark nonet is identified with $f_{0}(600),\kappa(800), f_{0}(980),
a_{0}(980)$. The mass splittings predicted by the Iachello mass formula are in
agreement with the KLOE, Fermilab E791 and BES experimental data.

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The categories of this paper are: acc-phys
2
The categories of this paper are: math
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th