Speaker
Description
Jet substructure is a powerful tool to probe the perturbative regime of jet evolution in proton-proton and heavy-ion collisions. Over the past few years, various substructure observables have been proposed to understand specific aspects of jet dynamics in a quark-gluon plasma (QGP).
In this talk, based on [1,2,3], we will explore the ability of such an observable, called Dynamical Grooming, to pin down the properties of the QGP. In particular, we will present the computation via analytic resummation techniques and Monte-Carlo simulations, of the opening angle $\theta_g$ of the hardest splitting in the jet as defined by Dynamical Grooming. This calculation, grounded in perturbative QCD, accounts for the factorization in time between vacuum-like and medium-induced processes in the double logarithmic approximation. Our main result is that the dominating scale in the $\theta_g$-distribution is the decoherence angle $\theta_c$ which characterizes the medium's resolution power to propagate color probes, which makes this observable particularly interesting to measure $\theta_c$ experimentally. To that aim, we will highlight a suitable combination of the Dynamical Grooming condition and the jet radius that leads to a pQCD-dominated observable with minimal sensitivity to the medium response.
Refs:
[1] P. Caucal, A. Soto-Ontoso and A. Takacs, JHEP07(2021)020
[2] P. Caucal, A. Soto-Ontoso and A. Takacs, Phys.Rev.D105(2022)114046
[3] J.H. Isaksen, A. Takacs and K. Tywoniuk, arXiv:2206.02811
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