Vector boson tagged jets and jet substructure

Abstract

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 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 √ 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.

Measurements of inclusive, boson-tagged, and heavy quark flavor jet energy loss in PbPb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the CMS detector

“…On the other hand, the jet quenching may depend on the type of the partons initiating the jets [3]. The jets associated with an isolated photon mainly originate from quarks [4] and therefore can be used to determine the quark and gluon behavior in the quenching by comparing it to the inclusive studies [5]. Furthermore, the b-tagging method provides a way to select the jets originated from bottom quarks, which can be used to study the jet quenching as a function of the parton flavor.…”