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Abstract This paper presents a measurement of the production cross-section of a Z boson in association with b - or c -jets, in proton–proton collisions at s = 13 s = 13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 140 fb^-1 fb - 1. Inclusive and differential cross-sections are measured for events containing a Z boson decaying into electrons or muons and produced in association with at least one b -jet, at least one c -jet, or at least two b -jets with transverse momentum p_ T > 20 p T > 20 GeV and rapidity |y| | y | 2. 5. Predictions from several Monte Carlo generators based on next-to-leading-order matrix elements interfaced with a parton-shower simulation, with different choices of flavour schemes for initial-state partons, are compared with the measured cross-sections. The results are also compared with novel predictions, based on infrared and collinear safe jet flavour dressing algorithms. Selected Z + 1~c Z + ≥ 1 c -jet observables, optimized for sensitivity to intrinsic-charm, are compared with benchmark models with different intrinsic-charm fractions.
Aad et al. (Fri,) studied this question.