Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar Glueball in a Top-Down Holographic Approach to QCD   Identification of glueballs -- bound states of gauge bosons in Quantum
Chromodynamics (QCD) -- is a very important open question in dynamics of the
strong interaction. The search for the glueball ground state, carrying scalar
quantum numbers, poses a particular challenge due to the existence of (i)
several candidates for its realisation in the physical spectrum and (ii)
inevitable mixing of the pure glueball state with those comprised of quarks. In
this article, I discuss implications of an approach in holographic QCD where,
among others, the mass and the two-pion decay of the pure scalar glueball can
be studied.

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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex