Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice QCD Calculations of the Sigma Commutator   As a direct source of information on chiral symmetry breaking within QCD, the
sigma commutator is of considerable importance. With recent advances in the
calculation of hadron masses within full QCD it is of interest to see whether
the sigma commutator can be calculated directly from the dependence of the
nucleon mass on the input quark mass. We show that provided the correct chiral
behaviour of QCD is respected in the extrapolation to realistic quark masses
one can indeed obtain a fairly reliable determination of the sigma commutator
using present lattice data. Within two-flavour, dynamical-fermion QCD the value
obtained lies in the range 45 to 55 MeV.

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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: eess