Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymptotic freedom in strong magnetic field   Perturbative gluon exchange interaction between quark and antiquark, or in a
3q system, is enhanced in magnetic field and may cause vanishing of the total
q\bar q or 3q mass, and even unlimited decrease of it - recently called the
magnetic collapse of QCD. The analysis of the one-loop correction below shows a
considerable softening of this phenomenon due to q\bar q loop contribution,
similarly to the Coulomb case of QED, leading to approximately logarithmic
dumping of gluon exchange interaction at large magnetic field.

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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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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: adap-org
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The categories of this paper are: cs
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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: q-alg
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex