Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Closed strings: Four massless states scattering amplitude   We compute the scattering amplitudes of four massless states for chiral
(closed) bosonic and type II superstrings using the Kawai-Lewellen-Tye ($KLT$)
factorization method. The amplitude in the chiral bosonic case is identical to
a field theory amplitude corresponding to the spin-$2$ tachyon, massless
gravitational sector and massive spin-2 tardyon states of the spectrum. Chiral
type II superstrings amplitude only possess poles associated with the massless
gravitational sector. We briefly discuss the extension of the calculation to
heterotic superstrings.

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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th