Measurements of vector bosons plus jets production with the ATLAS detector at the LHC

Lea Caminada,M Bosman,I Riu,M Martínez,A Juste,V Sorin

doi:10.1051/epjconf/20136014002

Lea Caminada, M Bosman + Show 4 more

Open Access

https://doi.org/10.1051/epjconf/20136014002

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Abstract

The production of jets in association with a W or Z boson in proton-proton collisions at √s = 7 TeV is measured with the ATLAS detector at the LHC. The cross sections, differential in several kinematic variables, have been measured up to high jet multiplicities and are compared to new higher-order QCD calculations. Measurements of vector bosons in association with heavy flavor, such as W+c and W+b production, have unique sensitivity to the heavy quark density of the proton. Differential cross sections are presented and compared to QCD predictions at NLO.

Highlights

Measurements of vector boson production in association with jets are important since they provide crucial information to improve our current understanding of strong interactions
The measurements test the predictions of perturbative QCD as well as their implementation in Monte Carlo (MC) simulations
High precision measurements of vector boson plus jets production are performed with the ATLAS experiment [1] at the LHC

Summary

Introduction

Measurements of vector boson production in association with jets are important since they provide crucial information to improve our current understanding of strong interactions. Measurements of vector boson plus heavy flavor production, W + b [5], W + c [6] and Z + b [7], are performed to probe pQCD calculations in the presence of heavy quarks These processes are sensitive to the quark content of the proton and intended to improve the current knowledge of the parton distribution functions (PDF) to allow for more accurate cross-section predictions. The measured cross sections as a function of the inclusive jet multiplicity are found to be consistent with the BlackHat+SHERPA calculation as well as with the predictions of ALPGEN and SHERPA. A measurement of the cross section for W-boson production in association with b-quark jets is performed using data corresponding to an integrated luminosity of 4.6 fb−1. The predictions are obtained using the aMC@NLO simulation [22], which is based on the MC@NLO formalism and the MadGraph framework [23], with Herwig++ [24] used to model the parton-shower, hadronization and underlying-event

The events are generated with different NLO and NNLO

Findings

Conclusion