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We study soft theorems at one loop in planar N=4 super Yang-Mills theorythrough finite order in the infrared regulator and to subleading order in thesoft parameter {\delta}. In particular, we derive a universal constraint fromdual superconformal symmetry, which we use to bootstrap subleading log {\delta}behaviour. Moreover, we determine the complete infrared-finite subleading softcontribution of n-point MHV amplitudes using momentum twistors. Finally, wecompute the subleading log {\delta} behaviour of one-loop NMHV ratio functionsat six and seven points, finding that universality holds within but not betweenhelicity sectors.

One-Loop Soft Theorems via Dual Superconformal Symmetry