Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the scattering length of the K^- d system   Multiple-scattering approximations to Faddeev calculations of the K^- d
scattering length are reviewed and compared with published Kbar-N-N <--> pi-Y-N
fully reactive Faddeev calculations. A new multiple-scattering approximation
which goes beyond the `fixed-center' assumption for the nucleons is proposed,
aiming at accuracies of 5-10%. A precise value of the K^- d scattering length
from the measurement of the K^- d 1s atomic level shift and width, planned by
the DEAR/SIDDHARTA collaboration, plus a precise value for the K^- p scattering
length by improving the K^- p atom measurements, are essential for extracting
the K^- n scattering length, for resolving persistent puzzles in low-energy
Kbar-N phenomenology and for extrapolating into Kbar-nuclear systems.

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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph