The striking suppression and modification patterns that are observed in jet observables measured in heavy-ion collisions, with respect to the proton-proton baseline, have the potential to constrain the spatio-temporal branching process of energetic partons in a dense QCD medium. The mechanism of jet energy loss in a deconfined medium is intricately associated with medium resolution of jet substructure fluctuations . This is naturally accompanied by modifications of jet substructure [2,3] and impacts the behaviour of the suppression of jets at high-pT . In this work, we highlight the connection between the breakdown of colour coherence and energy loss within a first-principle calculation of a parton splitting process taking place inside the medium . Furthermore, we discuss how a consistent picture between quenching effects and substructure modifications can aid in pinning down scales of the medium, focussing in particular on the advantage of applying grooming techniques to enhance the sensitivity to perturbative aspects of in-medium jet fragmentation .
 Y. Mehtar-Tani and Konrad Tywoniuk "Radiative energy loss of neighboring subjets" arXiv:1706.06047
 Y. Mehtar-Tani and Konrad Tywoniuk "Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung " arXiv:1610.08930
 Y. Mehtar-Tani and Konrad Tywoniuk, in preparation
 Y. Mehtar-Tani and Konrad Tywoniuk "Quenching of high-pT jet spectra" arXiv:1707.07361
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