Speaker
Description
Jet angularities are a class of substructure observables whose sensitivity to angular distribution of radiation in a jet is controlled by a continuous parameter ‘$b$’ (with, $b > −1$ for IR safety). For $b$ close to $0$, the effect of recoil of collinear emissions due to soft radiations in the jet is a leading power effect while it gets power suppressed as $b$ approaches $1$. In a previous work, we utilized a broadening-like factorization theorem for the whole range of angularity exponents and showed that at the next-to-leading-order accuracy, it effectively reproduces the known results for broadening ($b = 0$) and thrust ($b = 1$). This framework then allows us to understand how recoil effects the distribution of jet angularities and provides, within the effective theory approach, new results for singular cross-sections of angularities between the exponents $0 < b < 1$. However, for a complete phenomenological relevance of these results, one needs to resum the large logarithms in the fixed order results to a next-to-leading-logarithmic (NLL) accuracy. In this talk, I will overview some of the recent developments towards obtaining a NLL resummed result for recoil-sensitive jet angularities.