Measurement of the suppression of large-radius jets and its dependence on substructure in Pb+Pb and pp collisions with ATLAS

Measurements of the jet substructure in Pb+Pb collisions provide insight into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions, over a wide range of energy scales. This talk presents the ATLAS measurement of the suppression of yields of $R=0.2$ small-radius jets and re-clustered $R=1.0$ large-radius jets. The yield suppression measurement based on the large-radius jets is performed with dependence on the jet substructure, characterized by the angular correlation and splitting scale of their sub-jets produced in the earliest splitting. This measurement utilizes the large Pb+Pb data sample at the center-of-mass energy of 5.02 TeV recorded in 2018 and is compared to the result from 2017 $pp$ collisions at the same collision energy. This study of the suppression of yields of small-$R$ jets and re-clustered large-$R$ jets brings new information about the interaction of the parton shower with the medium and tests the sensitivity of the jet quenching to the color coherence effects.