Abstract
Jet production and jet substructure modification in heavy-ion collisions have played an essential role in revealing the in-medium evolution of parton showers and the determination of the properties of strongly-interacting matter under extreme conditions. It is imperative to extend these studies to include flavor tagging and to devise observables that are sensitive to the partonic origin of jets. The average jet charge, defined as the momentum-weighted sum of the electric charges of particles inside the jet, is a proxy of the electric charge of the quark or gluon that initiates the jet. We demonstrate how the factorization framework of soft-collinear effective theory can be generalized to evaluate the jet charge in a dense strongly-interacting matter environment, such as the one produced in nuclear reactions at collider energies. Observables that can separate the contribution of in-medium branching from the trivial isospin effects are identified and their connection to established jet quenching effects is elucidated. We present predictions for the transverse momentum dependence of the jet charge distribution in nucleus-nucleus collisions and its modification relative to the proton case.
Highlights
Jet production in hadronic collisions is a ubiquitous and well-studied process in quantum chromodynamics (QCD) [1]
A new level of precision in the calculation of jet observables and insights into the substructure of jets has been achieved using the techniques of soft-collinear effective theory (SCET) [2,3,4,5,6]
In collisions of heavy nuclei, the cross section and substructure of jets are modified by the formation of parton showers qualitatively different than the ones in the vacuum [7]
Summary
Jet production in hadronic collisions is a ubiquitous and well-studied process in quantum chromodynamics (QCD) [1]. In collisions of heavy nuclei, the cross section and substructure of jets are modified by the formation of parton showers qualitatively different than the ones in the vacuum [7]. These phenomena, generally known as “jet quenching,” provide a promising avenue to study the properties of the quark-gluon plasma produced in heavy-ion collisions. Some level of discrimination between inclusive jets and quark jets can be achieved via away-side photon tagging, which helps isolate the inverse Compton scattering process in QCD. Initial studies focused on the momentum imbalance distribution of vector boson-tagged
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