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We introduce a new purely bosonic, $\frac{1}{6}$ BPS Wilson loop for ABJMtheory on $S^3$ that couples scalar fields to a latitude at an angle $\theta$on $S^2\in\mathbb{C}P^3$. Through localization of this operator, we relate theexpansion of the cusp anomalous dimension at small cusp angles to thelogarithmic derivative of the ABJM Wilson loop. This defines,non-perturbatively in the 't Hooft coupling, the bremsstrahlung function$B(\lambda)$ describing in three dimensions the soft radiation of a $W$-bosonundergoing a sudden change in trajectory. We compare our results for$B(\lambda)$ to the known weak/strong coupling expansions of the function$h(\lambda)$ that enters integrability. At weak coupling we precisely match thepreviously known two-loop result. At strong coupling we find agreement atleading order in $\sqrt{\lambda}$, but a mismatch of the constant coefficient.We comment on the striking similarity that we observe between these two, inprinciple, unrelated functions.

Notes on BPS Wilson Loops and the Cusp Anomalous Dimension in ABJM theory