Abstract
The differential cross section predictions for the associated production of a Z boson and jets are presented in proton-proton collisions at a center-of-mass energy of 13 TeV. The differential cross sections are calculated by using a computational framework for the dielectron decay mode of the Z boson. Higher-order differential cross section predictions are obtained in the fiducial phase space and are compared at next-to-leading order (NLO) and next-to-NLO (NNLO) in perturbative quantum chromodynamics (pQCD). The predicted results are reported as functions of the variables including the jet multiplicity, the invariant mass of the Z boson, and transverse momenta of the Z boson and of the decay products. The predicted results are also reported for the angular correlation variables for the final state decay products. The differential results are generally improved in precision upon inclusion of the NNLO corrections. The total cross sections are calculated in the fiducial phase space at different orders in pQCD up to NNLO. The total production rates are predicted more accurately by the NNLO calculation.
Highlights
The production of a vector boson in association with jets at hadron colliders provides fundamental tests for quantum chromodynamics (QCD) sector of the standard model (SM)
The Z+jets production cross sections have been measured differentially by the ATLAS, CMS, and LHCb Collaborations in pp collisions at center-of-mass energies of 7 [3,4,5,6], 8 [7,8,9], and 13 [10, 11] TeV at the Large Hadron Collider (LHC). In all of these complementary measurements, experimental data have been compared with predictions from various Monte Carlo (MC) event generators and higher-order perturbative QCD calculations including either nextto-leading order (NLO) or next-to-next-to-leading order (NLO) (NNLO) corrections
The higher-order theoretical calculations including NLO and NNLO corrections in perturbative quantum chromodynamics (pQCD) are needed to be performed for improving the accuracy in description of large experimental data accumulated by the LHC experiments
Summary
The production of a vector boson in association with jets at hadron colliders provides fundamental tests for quantum chromodynamics (QCD) sector of the standard model (SM). The Z+jets production cross sections have been measured differentially by the ATLAS, CMS, and LHCb Collaborations in pp collisions at center-of-mass energies of 7 [3,4,5,6], 8 [7,8,9], and 13 [10, 11] TeV at the LHC In all of these complementary measurements, experimental data have been compared with predictions from various Monte Carlo (MC) event generators and higher-order perturbative QCD (pQCD) calculations including either nextto-leading order (NLO) or next-to-NLO (NNLO) corrections. Differential cross section predictions at NLO and NNLO accuracies for the Z+jets production in the dielectron decay channel are presented based on pp collisions at a center-of-mass energy of 13 TeV.
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