Abstract
We reconsider the associated Z boson and charm or beauty jet production at the LHC by paying special attention to the formation dynamics of heavy jets. Two different approaches are studied: first one, where heavy quarks are produced in the hard scattering subprocesses, implemented in the Monte-Carlo generator pegasus, and another method, where the hard scattering is calculated at NLO with MadGraph5_aMC@NLO and TMD parton shower is included (implemented in the Monte-Carlo generator Cascade3). We compare the predictions obtained in both schemes with latest experimental data for associated Z + b production cross sections and the relative production rate sigma (Z + c)/sigma (Z + b) collected by the ATLAS and CMS Collaborations at sqrt{s} = 13 TeV. We introduce two kinematic observables (denoted as z_b and p_T^mathrm{rel}) which can be used to discriminate between the heavy jet production mechanisms. Using these variables we trace the shape of the simulated b-jet events and recommend that these observables be taken into consideration in the forthcoming experimental analyses.
Highlights
We introduce two kinematic observables which can be used to discriminate between the heavy jet production mechanisms
The scenario implemented into pegasus, where the heavy quark is produced in the hard partonic scattering at the amplitude level, is able to reproduce well the measured distributions in Z boson and b jet rapidity and transverse momenta
We have considered the production of Z bosons associated with charm and beauty jets at LHC conditions
Summary
We have demonstrated [6,7] a quite reasonable agreement between the theoretical and experimental results with respect to many observables, such as the differential cross sections and particle correlations. We aim at a difference between ‘prompt’ and ‘non-prompt’ production cases. The former class refers to the situation when the b-quark is produced in the hard scattering subprocess; it further radiates lighter partons and after all evolves into a jet containing b-hadrons. We find that in the jets originating from b-quarks (i.e., ‘prompt’), b-hadrons carry larger momentum fraction zb than in other (‘non-prompt’) jets. In this article we revisit the associated production of Z bosons and heavy quark jets. This process involves both weak and strong interactions and serves as a complex test of the Standard Model, perturbative QCD and our knowledge of parton densities. We have at our disposal the data collected by ATLAS and CMS collaborations [1,2,3,4,5]
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