Abstract
Major event generators deviate significantly in their description of quark and gluon initiated jets. The modelling of these is particularly sensitive to the colour reconnection model used in the cluster hadronization model in the event generator Herwig. However, up to now, observables sensitive to the light flavour of jets have not been widely used in the construction and tuning of event generators. The scheme used in Herwig and changes within it are investigated using observables in e +e − and pp collisions, which are expected to discriminate quark and gluon jets.
Highlights
Experimental analyses at colliders like the LHC rely on efficient suppression of background processes, QCD jet production often being an important one
Looking at the perturbative part of event generation, one can form a first expectation of what observables are potentially useful in distinguishing quark and gluon jets
The model described above will be referred to as the default model, to distinguish it from the changes explained below. It was noticed [1] that the discrimination power between quark and gluon initiated jets of certain observables as predicted by Herwig strongly depends on this part of the hadronization model
Summary
Experimental analyses at colliders like the LHC rely on efficient suppression of background processes, QCD jet production often being an important one. QCD 2 → 2 scattering receives a significant contribution from gluon initiated jets. This makes distinguishing quark and gluon jets a vital experimental tool. It is crucial to understand the modelling of quark and gluon jets in Monte Carlo event generators. Changes to the hadronization model used in Herwig 7 [3, 4] are investigated, considering observables sensitive to the quark and gluon nature of jets.
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