Speaker
Description
Observables computed on jets groomed with mMDT, or equivalently Soft Drop with $\beta=0$, benefit from reduced sensitivity to pileup, underlying event, and hadronisation, compared to observables computed on un-groomed jets. Observables computed on groomed jets are therefore good candidates for direct comparison between perturbative QCD predictions and measurements.
Focusing on quark initiated jets, we present a method for computing the distributions of groomed observables at next-to-next-to-leading logarithmic (NNLL) accuracy directly in perturbative QCD, in the limit that $z_{\mathrm{cut}}$ is small. This method can be applied to any additive, recursively infra-red and collinear safe (rIRC safe) observable. Predictions for the groomed heavy hemisphere mass, Width, and Les Houches angularity (LHA) are presented, the groomed Width and LHA not having been presented at NNLL before. We then modify our results to include finite $z_{\mathrm{cut}}$ effects at next-to-leading logarithmic (NLL) accuracy as well as next-to-leading order (NLO) matching, this being the first time that finite $z_{\mathrm{cut}}$ effects at NLL accuracy have been included in an NNLL resummation.
