Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: \alpha'-Expansion of Open String Disk Integrals via Mellin
  Transformations   Open string disk integrals are represented as contour integrals of a product
of Beta functions by using Mellin transformations. This makes the mathematical
problem of computing the \alpha' expansion around the field theory limit
basically identical to that of the \epsilon expansion in Feymann loop integrals
around the four dimensional limit. More explicitly, the formula in Mellin space
obtained directly from the standard Koba-Nielsen like representation is valid
in a region of values of \alpha' that does not include \alpha'=0. Analytic
continuation is therefore needed since contours are pinched by poles as \alpha'
approaches 0. Deforming contours that get pinched by poles generates a set of
(n-3)! multidimensional residues left behind which contain all the field theory
information. We end by drawing some analogies between the field theory formulas
obtained by this method and those derived recently from using the scattering
equations.

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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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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: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph