Measurement of vector bosons production in ATLAS. ICNFP2013

Title: Measurements of vector bosons plus jets production with the ATLAS detector Abstract content The production of jets in association with a W or Z boson in proton-proton collisions at 7 TeV study multi-leg QCD diagrams and probe electroweak production via vector-boson fusion mechanism. The cross sections, differential in several kinematics variables, have been measured up to high jet multiplicities and compared to new higher-order QCD calculations. Measurements of vectors 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. Title: Measurements of inclusive W and Z production in ATLAS Abstract content The production of the W and Z bosons is the standard candle process at the LHC. The differential Z/gamma∗ and the charge dependent W+ and W- cross sections are provided in bins of boson rapidity and lepton pseudorapidity. A measurement of the lepton forward-backward asymmetry for Z/gamma* production is used to determine the weak mixing angle. A measurement of angular correlations in Drell–Yan lepton pairs for neutral current process via the phi* observable is also presented. Neutral current Drell Yan off-Z resonance peak cross section is sensitive to the proton parton distribution functions, in particular to u-bar quark density. An overview of these results is given.