Speaker
Description
The distribution of transverse energy flow into an azimuthal strip presents novel theoretical features and accompanying challenges in its all-order description. Its resummation structure depends non-trivially on the axis definition, with the standard thrust axis breaking naive double-logarithmic exponentiation. Moreover it receives non-global logarithmic (NGL) enhancements that start with $\mathcal{O}(\alpha_s^2L^3)$ rather than the usual single-logarithmic NGL structure. We investigate the logarithmic structure of this observable at both lepton and hadron colliders and present resummed analytic results at the next-to-double-logarithmic order, as well as a numerical algorithm for its leading-logarithmic resummation at leading $N_C$. We find that standard widely used dipole showers fail to describe the observable beyond crude double-logarithmic estimates. This study shows that simple modifications to well-studied observables can lead to complex theoretical structures, underscoring the need for flexible numerical tools with high logarithmic precision.
