New analytic tools, including an all-kinematics five-point closed form, for tree-level open string amplitudes come from the u-variable formulation.
High-energy behaviour of the Bardakçi-Ruegg ampli- tude,
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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.