Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of the strangeness contents of light-flavour isoscalars
  from its production rates in hadronic Z decays measured at LEP   A new phenomenological approach is suggested to determine the strangeness
contents of light-flavour isoscalars. This approach is based on
phenomenological laws of hadron production related to the spin, isospin,
strangeness content and mass of the particles. The ``effective'' numbers of s
and \bar{s} quarks in the isoscalar partners i_1 and i_2 are given by the
nonstrange-strange mixing angle \phi: k(i_1)=2\sin^2\phi and
k(i_2)=2\cos^2\phi. From the total production rates per hadronic Z decay of all
light-flavour hadrons measured so far at LEP the values for k are found to be:
k(\eta) \equiv 2-k(\eta^{\prime}) = 0.91 \pm 0.12, k(\phi) \equiv 2-k(\omega) =
1.94 \pm 0.09, k(f_2^{\prime}) \equiv 2-k(f_2) = 1.84 \pm 0.21 and k(f_0) =
0.09 \pm 0.13. Our results on the \eta--\eta^{\prime}, \omega--\phi and
f_2--f_2^{\prime} isoscalar mixing are consistent with the present experimental
evidence. Quite remarkably, our value for k(\eta) corresponds to the
singlet-octet mixing angle \theta_P = -12.4^{\circ} \pm 3.5^{\circ}. The
obtained strangeness content of the f_0(980) scalar/isoscalar is not consistent
with the values supported by different model studies. However, taking the
f_0(980) in our analysis with the mass of the bare state (K-matrix pole)
f_0^{bare}(720 \pm 100), the mixing angle is found to be: |\phi_S^{bare}| =
73^{\circ} \pm 7^{\circ} \pm 24^{\circ}, in good agreement with the prediction
of the K-matrix analysis.

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The categories of this paper are: chem-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat