Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion magnetic polarisability using the background field method   The magnetic polarisability is a fundamental property of hadrons, which
provides insight into their structure in the low-energy regime. The pion
magnetic polarisability is calculated using lattice QCD in the presence of
background magnetic fields. The results presented are facilitated by the
introduction of a new magnetic-field dependent quark-propagator eigenmode
projector and the use of the background-field corrected clover fermion action.
The magnetic polarisabilities are calculated in a relativistic formalism, and
the excellent signal-to-noise property of pion correlation functions
facilitates precise values.

14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: stat
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph