Measurement of the production of a W boson in association with a charm quark in pp collisions at $ \sqrt{s} $ = 7 TeV with the ATLAS detector

W boson , charm quark , hadron collisions ratio: (strangeness down) Teoría cuántica de campos Quarks parton: distribution function cross section: ratio W: leptonic decay Atomic 01 natural sciences 7. Clean energy Mathematical Sciences 510 High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) Particle and Plasma Physics [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] Electroweak interaction Electroweak interaction; Hadron-Hadron Scattering; Charm physics info:eu-repo/classification/ddc/530 Mathematical Physics p p: interaction QC Charm physics LHC; ATLAS; High Energy Physics Quantum Physics charm: particle identification W+: hadroproduction QC0170 higher-order: 1 Particle and High Energy Physics ATLAS Nuclear and Plasma Physics Nuclear & Particles Physics Settore FIS/01 - FISICA SPERIMENTALE Nuclear and plasma physics Dispersión (Física) CERN LHC Coll Particle and high energy physics CHARM QUARK Mathematical physics 7000 GeV-cms Physical Sciences Charm Physics W-: hadroproduction Nuclear and High Energy Physics [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] Charm physics; Electroweak interaction; Hadron-Hadron scattering; Nuclear and High Energy Physics FOS: Physical sciences ddc:500.2 530 info:eu-repo/classification/ddc/500.2 charm: associated production differential cross section: measured elementary particles physics; electroweak interaction; hadron-hadron scattering; charm physics lepton: rapidity 539 0103 physical sciences Fysik Nuclear quantum chromodynamics: perturbation theory W BOSON quark: sea Hadron-Hadron Scattering hep-ex Matemática física y química 500 Molecular parametrization Electroweak Interaction Hadrones - Dispersión QC Physics / fizika Experimental High Energy Physics Charm physics; Electroweak interaction; Hadron-Hadron scattering p p --> W charm anything experimental results
DOI: 10.1007/jhep05(2014)068 Publication Date: 2014-05-30T01:42:53Z
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ABSTRACT
52 pages plus author list (74 pages total), 16 figures, 11 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-14/<br/>The production of a W boson in association with a single charm quark is studied using 4.6 fb^-1 of pp collision data at sqrt(s)=7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96 +0.26 -0.30 at Q^2=1.9 GeV^2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio sigma(W^+ + bar{c})/sigma(W^- + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s-bar{s} quark asymmetry.<br/>
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