Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parton Distribution in Pseudoscalar Mesons with a Light-Front
  Constituent Quark Model   We compute the distribution amplitudes of the pion and kaon in the
light-front constituent quark model with the symmetric quark-bound state vertex
function. In the calculation we explicitly include the flavor-SU(3) symmetry
breaking effect in terms of the constituent quark masses of the up (down) and
strange quarks. To calculate the kaon parton distribution functions~(PDFs), we
use both the conditions in the light-cone wave function, i.e., when $\bar{s}$
quark is on-shell, and when $u$ quark is on-shell, and make a comparison
between them. The kaon PDFs calculated in the two different conditions clearly
show asymmetric behaviour due to the flavor SU(3)-symmetry breaking implemented
by the quark masses.

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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc