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arXiv · 2001.09071

Nuclear effects on jet substructure observables at the LHC

Paul Caucal·Edmond Iancu·Gregory Soyez
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Abstract

Using a pQCD picture for jet evolution in a dense QCD medium, in which medium-induced parton branchings are factorized from vacuum-like emissions, we study two jet substructure observables: the $z_g$ and the Soft Drop multiplicity distributions. We compute the respective nuclear modification factors using a Monte-Carlo implementation of the parton showers. Our results are in qualitative agreement with LHC data for Pb+Pb collisions. We identify the physical mechanisms explaining our results: incoherent jet energy loss, semi-hard medium-induced emissions and the bias introduced by the steeply falling jet spectrum.

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Paul Caucal, Edmond Iancu, Gregory Soyez. 2020-01-24. Nuclear effects on jet substructure observables at the LHC. https://doi.org/10.1016/j.nuclphysa.2020.121897

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