title: Measurement of the W boson production in association with jets using √s = 8TeV proton-proton collisions at  the ATLAS detector
creator: Lang, Valerie Susanne
subject: ddc-530
subject: 530 Physics
description: The production of W bosons in association with jets serves as a precision test of perturbative quantum chromodynamics (pQCD). Split into W⁺ and W⁻ production, it provides access  to the valence quark composition in the proton. The measurement of W + jets production presented here uses 20.3fb⁻¹ of proton-proton collision data at a center-of-mass energy of √s = 8TeV recorded with the ATLAS detector. The cross section measurement is performed  in the decay channel W → eν for the charge-independent W production as well as W⁺ and W⁻ production separately, as a function of the jet multiplicity and differentially as a function of six observables in association with at least one or two jets. The results are compared to leading-order multi-leg and next-to-leading order pQCD calculations. The cross section ratio (W⁺ + jet)/(W⁻ + jet) is shown to be sensitive to the ratio of valence quark distribution  functions in the proton, in a range of the momentum fraction x ∼ 0.1 − 0.5. This range is accessible so far mainly by fixed-target deep inelastic scattering experiments and the W asymmetry measurements at the Tevatron. The ratio of W⁺ to W⁻ production is measured  as a function of the jet multiplicity and six observables in the presence of at least one or at least two jets, providing essential input to global fits of parton distribution functions.
date: 2016
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/21708/1/Thesis_WjetsMeasurement8TeV_VLang.pdf
identifier: DOI:10.11588/heidok.00021708
identifier: urn:nbn:de:bsz:16-heidok-217081
identifier:   Lang, Valerie Susanne  (2016) Measurement of the W boson production in association with jets using √s = 8TeV proton-proton collisions at the ATLAS detector.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/21708/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng