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. Z0-tagging and γ-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 √sNN = 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.
Highlights
In ultrarelativistic collisions of heavy nuclei a new deconfined state of matter, the quark-gluon plasma (QGP), is expected to be formed
The production of a vector boson in association with jets is a powerful channel to probe the fundamental properties of Quantum Chromodynamics (QCD)
Good description of the mean momentum imbalance shift ∆ xJV and the tagged jet nuclear modification factor IAA can be achieved in a framework that accounts for the QGP-induced radiative and collisional dissipation of the parton shower energy outside of the jet cone
Summary
In ultrarelativistic collisions of heavy nuclei a new deconfined state of matter, the quark-gluon plasma (QGP), is expected to be formed. Previous studies of vector boson tagged jet production in heavy ion collisions have been performed in the framework of perturbative QCD [5, 6]. The emergence of in-medium parton branching, qualitatively different from the one which determines the jet properties in e+ + e−, e− + p, and p + p collisions, implies non-trivial modification of jet substructure observables. These include jet shapes, jet fragmentation functions and jet momentum sharing distributions. In these proceedings we report on calculation of two of the above [14, 15] in a theoretical framework that uses the same fundamental input – the in-medium splitting functions
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