Vector boson tagged jets and jet substructure

TL;DR

This paper discusses recent theoretical and experimental studies of vector boson-tagged jets in heavy ion collisions, focusing on jet substructure modifications and energy loss mechanisms in the quark-gluon plasma at the LHC.

Contribution

It provides new theoretical predictions for tagged jet production and analyzes their modifications in heavy ion collisions, comparing with recent experimental data.

Findings

Jet substructure in heavy ion collisions differs from proton-proton collisions.

Tagged jets help constrain parton energy loss in quark-gluon plasma.

Experimental data shows medium-induced radiative corrections.

Abstract

In these proceedings, we report on recent results related to vector boson-tagged jet production in heavy ion collisions and the related modification of jet substructure, such as jet shapes and jet momentum sharing distributions. $Z^0$-tagging and $\gamma$-tagging of jets provides new opportunities to study parton shower formation and propagation in the quark-gluon plasma and has been argued to provide tight constrains on the energy loss of reconstructed jets. We present theoretical predictions for isolated photon-tagged and electroweak boson-tagged jet production in Pb+Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV at the LHC, addressing the modification of their transverse momentum and transverse momentum imbalance distributions. Comparison to recent ATLAS and CMS experimental measurements is performed that can shed light on the medium-induced radiative corrections and energy dissipation due to collisional processes of predominantly quark-initiated jets. The modification of parton splitting functions in the QGP further implies that the substructure of jets in heavy ion collisions may differ significantly from the corresponding substructure in proton-proton collisions. Two such observables and the implication of tagging on their evaluation is also discussed.