Abstract

The production of vector bosons (Z and W) in association with jets provides a stringent test of perturbative QCD and is a background process in searches for new physics. Differential cross section measurements of vector bosons produced in association with jets and heavy flavour quarks in proton-proton collisions at center of mass energies of 8 TeV and 13 TeV in the CMS experiment at the LHC are presented. The measurements are compared to next-to-leading order calculations and event simulations that devise matrix element calculations interfaced with parton showers.

Highlights

  • The production of vector bosons (Z and W) in association with jets is an important Standard Model (SM) benchmark providing precision tests for perturbative Quantum Chromodynamics calculations and inputs for improving parton distribution functions (PDFs)

  • In Vector boson and associated jets (V+jets) measurements, Z and W bosons are reconstructed through their leptonic decays (Z/γ∗ → l+l−, W → lν) and their productions in association with jets are characterised by measured differential cross sections as a function of various observables including jet multiplicity and kinematics, angular correlations, and invariant masses

  • The latest results on the V+jets production are reviewed based on mostly 8 TeV and 13 TeV proton-proton collisions data recorded by the Compact Muon Solenoid (CMS) detector [1] at the CERN Large Hadron Collider (LHC)

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Summary

Introduction

The production of vector bosons (Z and W) in association with jets is an important Standard Model (SM) benchmark providing precision tests for perturbative Quantum Chromodynamics (pQCD) calculations and inputs for improving parton distribution functions (PDFs). The measured differential distributions are compared to predictions by MADGRAPH5_aMC@NLO [9], interfaced with PYTHIA 8 [10] for PS and hadronization, at NLO accuracy up to 2 additional partons merged using FxFx scheme [11] and by an NNLO fixed order calculation [12, 13] for Z + 1 jet production. The measurement of the differential cross sections for W boson production in the muon decay channel and jets is present√ed with data corresponding to an integrated luminosity of 19.6 fb−1 recorded by the CMS detector at s = 8 TeV [14]. The measured differential cross section as a function of azimuthal separation between the first leading jet and the muon is well described by the multileg LO and NLO predictions, fixed order NLO shows lower trend in describing data as shown in figure 2 (right). The differential cross sections for Z+b jets and the cross section ratios for the associated one inclusive b jet and any jets are better described by the predictions using 5FS approach than 4FS as shown in figure 3

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