Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The mass of the sigma pole   BES data on the sigma pole are refitted taking into account new information
on coupling of sigma to KK and eta-eta. The fit also includes Cern-Munich data
on pi-pi elastic phases shifts and Ke4 data, and gives a pole position of 500
+- 30 - i(264 +- 30) MeV. However, there is a clear discrepancy with the sigma
pole position recently predicted by Caprini et al. using the Roy equation. This
discrepancy may be explained naturally by uncertainties arising from
inelasticity in KK and eta-eta channels and mixing between sigma and f0(980).
Adding freedom to accomodate these uncertainties gives an optimum compromise
with a pole position of 472 +- 30 - i(271 +- 30) MeV.

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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: atom-ph