Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New measurement of the charged kaon semileptonic (Ke4) decay Branching
  Ratio and Hadronic Form Factors   A sample of more than one million Ke4 decay candidates with less than one
percent background contamination has been collected by the NA48/2 experiment at
the CERN SPS in 2003-2004, allowing a detailed study of the decay properties.
The branching ratio, inclusive of radiative Ke4gamma decays, is measured to be
BR(Ke4) = (4.257 +/- 0.016_exp +/- 0.031_ext) x 10-5 with a total relative
error of 0.8%. This measurement complements the study of S- and P-wave hadronic
form factors by assigning absolute values to the relative hadronic form factors
obtained earlier in a simultaneous analysis of the pion-pion scattering lengths
conducted on the same data sample. The overall form factor normalization f_s =
5.705 +/- 0.017_exp +/- 0.031_ext is obtained with a total relative precision
of 0.6%.

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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
1
The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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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: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn