Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bounds on quark mass matrices elements due to measured properties of the
  mixing matrix and present values of the quark masses   We obtain constraints on possible structures of mass matrices in the quark
sector by using as experimental restrictions the determined values of the quark
masses at the $M_Z$ energy scale, the magnitudes of the quark mixing matrix
elements $V_{\rm ud}$, $V_{\rm us}$, $V_{\rm cd}$, and $V_{\rm cs}$, and the
Jarlskog invariant $J(V)$. Different cases of specific mass matrices are
examined in detail. The quality of the fits for the Fritzsch and Stech type
mass matrices is about the same with $\chi^2/{\rm dof}=4.23/3=1.41$ and
$\chi^2/{\rm dof}=9.10/4=2.28$, respectively. The fit for a simple
generalization (one extra parameter) of the Fritzsch type matrices, in the
physical basis, is much better with $\chi^2/{\rm dof}=1.89/4=0.47$. For
comparison we also include the results using the quark masses at the 2 GeV
energy scale. The fits obtained at this energy scale are similar to that at
$M_Z$ energy scale, implying that our results are unaffected by the evolution
of the quark masses from 2 to 91 GeV.

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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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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: dg-ga
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The categories of this paper are: math
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The categories of this paper are: funct-an