text: 20,41,1442097175454908417,226785003,Raghav Kunnawalkam Elayavalli,"New paper time from @RHIC_STAR! <LINK> The preliminary results have been public for a few years now so i thought i would just highlight the main takeaways from the paper :) 1/x This is essentially the first measurement that looks at a canonical energy loss observable (dijet asymmetry) as a function of an actual resolution scale (subjet opening angle) in the medium 2/x There have been other measurements of energy loss (such as RAA) vs jet mass or mass/pT (handle of virtuality) and the Softdrop groomed jet radius but its not a scale in the medium 3/x thats where this measurements comes into play. we highlight the importance of an angle observable thats sensitive to physics but also simultaneously robust to the heavy ion underlying event 4/x subjets to the rescue! using a formation time argument, we come to our interpretation of the data is that a shorter medium path length and the dijet selection bias at RHIC energies, leads to ... 5/x an observation of jet quenching of a single color charge! this is the QCD analogue of the LPM effect in action! Like i said before this is our understanding of the data and i would love for our community to use this data and study different hypothesis 6/x my view - these types of differential measurements are how we will understand the QGP's transport properties. isolate specific populations of jet topology and systematically explore modifications in the emissions phase space! this will lead us to space-time evolution 7/x",https://arxiv.org/abs/2109.09793,"The STAR collaboration presents jet substructure measurements related to both the momentum fraction and the opening angle within jets in \pp and \AuAu collisions at \sqrtsn $= 200$ GeV. The substructure observables include SoftDrop groomed momentum fraction (\zg), groomed jet radius (\rg), and subjet momentum fraction (\zsj) and opening angle (\tsj). The latter observable is introduced for the first time. Fully corrected subjet measurements are presented for \pp collisions and are compared to leading order Monte Carlo models. The subjet \tsj~distributions reflect the jets leading opening angle and are utilized as a proxy for the resolution scale of the medium in \AuAu collisions. We compare data from \AuAu collisions to those from \pp which are embedded in minimum-bias \AuAu events in order to include the effects of detector smearing and the heavy-ion collision underlying event. The subjet observables are shown to be more robust to the background than \zg~and \rg. We observe no significant modifications of the subjet observables within the two highest-energy, back-to-back jets, resulting in a distribution of opening angles and the splittings that are vacuum-like. We also report measurements of the differential di-jet momentum imbalance ($A_{\rm{J}}$) for jets of varying \tsj. We find no qualitative differences in energy loss signatures for varying angular scales in the range $0.1 < $ \tsj $ < 0.3$, leading to the possible interpretation that energy loss in this population of high momentum di-jet pairs, is due to soft medium-induced gluon radiation from a single color-charge as it traverses the medium. ","Differential measurements of jet substructure and partonic energy loss