Abstract
Processes in which a jet recoils against an electroweak boson complement studies of jet quenching in heavy ion collisions at the LHC. As the boson does not interact strongly it escapes the dense medium unmodified and thus provides a more direct access to the hard scattering kinematics than can be obtained in di-jet events. First measurements of jet modification in these processes are now available from the LHC experiments and will improve greatly with better statistics in the future. We present an extension of JEWEL to boson-jet processes. JEWEL is a dynamical framework for jet evolution in a dense background based on perturbative QCD, that is in agreement with a large variety of jet observables. We also obtain a good description of the CMS and ATLAS data for y+jet and Z+jet processes at 2.76 TeV and 5.02 TeV.
Highlights
The theoretical description of jet quenching in boson–jet events is the same as in pure jet events, in some approaches boson–jet [14,15,16,17,18,19,20,21] or γ –hadron [22,23,24] observables have been discussed
Boson+jet processes provide an important test for the predictions of jet quenching frameworks that have already been constrained on other jet quenching data
The emissions due to the scale evolution of the jet get dynamically interleaved with radiation associated to rescatterings in such a way that re-scattering can only induce radiation if its formation time is shorter than the lifetime of the hard parton. This implies that only a hard re-scattering can perturb hard parton shower emissions related to the initial jet production process, so that the hard jet structure is protected from medium modifications
Summary
The theoretical description of jet quenching in boson–jet events is the same as in pure jet events, in some approaches boson–jet [14,15,16,17,18,19,20,21] or γ –hadron [22,23,24] observables have been discussed . Jewel is a fully dynamical perturbative framework for jet quenching It describes the simultaneous scale evolution of hard partons giving rise to jets and re-scattering in the medium. The emissions due to the scale evolution of the jet get dynamically interleaved with radiation associated to rescatterings in such a way that re-scattering can only induce radiation if its formation time is shorter than the lifetime of the hard parton This implies that only a hard re-scattering can perturb hard parton shower emissions related to the initial jet production process, so that the hard jet structure is protected from medium modifications. This principle shares important features with colour coherence The corrections to differential distributions remain, but are typically smaller
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