New analytic tools, including an all-kinematics five-point closed form, for tree-level open string amplitudes come from the u-variable formulation.
On Hypergeometrics 3F2(1) - A Review
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By systematically applying ten well-known and inequivalent two-part relations between hypergeometric sums 3F2(...|1) to the published database of all such sums, 62 new sums are obtained. The existing literature is summarized, and many purportedly novel results extracted from that literature are shown to be special cases of these new sums. The general problem of finding elements contiguous to Watson's, Dixon's and Whipple's theorems is reduced to a simple algorithm suitable for machine computation. Several errors in the literature are corrected or noted. The present paper both summarizes and extends a previous work on this subject.
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Open String Amplitudes: Singularities, Asymptotics, and New Representations
New analytic tools, including an all-kinematics five-point closed form, for tree-level open string amplitudes come from the u-variable formulation.