Production of vector bosons in association with jets in ATLAS

TL;DR

This paper presents detailed measurements of vector boson production with jets at the LHC, exploring various kinematic regimes and comparing results with theoretical predictions to enhance understanding of strong and electroweak interactions.

Contribution

It provides new differential cross section measurements for W/Z boson plus jets at different energies, including angular distributions and jet clustering scales, using advanced analysis techniques.

Findings

Measured Z+jets cross sections at 13 TeV in fiducial phase space.

Analyzed W+jets at 8 TeV with focus on electroweak production.

Studied jet properties via splitting scales in the kt algorithm.

Abstract

Measurements of the production of jets in association with a W/Z boson in proton-proton collisions are presented using data collected by the ATLAS experiment at LHC at sqrt s = 8 and 13 TeV. Several kinematic regimes are explored with various approaches to probe different aspects of these processes. The differential cross sections of a Z boson in association with jets with pT > 30 GeV and |y|< 2.5 at sqrt s = 13 TeV are measured in a fiducial phase space, probing strong interactions that completely dominate in these processes, while measurements of a W boson in association with at least two jets at high pT and high di-jet invariant mass, where the electroweak production is enhanced, are performed with sqrt s = 8 TeV data. Angular distributions in W+jets events with high pT jets are also measured at sqrt s = 8 TeV focusing on small angular separation between the jets and the W decay products, where contributions from real W emission are expected large. Finally a measurement of the splitting scales occurring in the kt jet-clustering algorithm is presented for final states containing a Z boson at sqrt s = 8 TeV. This measurement based on charged-particle track information constitutes a complementary approach to study jet properties. Data distributions of all the measurements are corrected for detector effects and compared with state-of-art predictions.