W/Z boson production and properties measurements

Marco Musich,Nicola Orlando

doi:10.22323/1.188.0019

Abstract

Observation of the electroweak gauge bosons via their decays to electrons and muons provide an important test of the Standard Model of particle physics. Inclusive W and Z boson cross section measurements provide checks of Next-to-Next-to-Leading-Order perturbative QCD calculations, while differential and double-differential Drell-Yan cross section investigate both QCD and PDF constraints. The measurement of the associated production of jets and vector bosons allows for stringent constraints of perturbative QCD calculations and is sensitive to the presence of new physics beyond the Standard Model. Measurements of jet production rates in association with W, Z/γ ∗ , in proton-proton collisions at 7 and 8 TeV center-of-mass energy are presented, using data collected with the ATLAS and CMS detector. Measurements include inclusive jet multiplicity, differential jet cross sections, as well as associated charm- and bottom-quark jet production.

Highlights

Marco MUSICHThe study of W ± and Z1 vector bosons production in proton-proton collisions at the LHC represents an important test of perturbative QCD calculations, and can be used to constrain the parton density functions (PDF) of the proton
The φη∗ variable measured in Z → + − events from D0/ [25] has been found in the past to be one of the most effective handles on the description of the underlying event at the Tevatron [26], and has been effectively used to discriminate Monte Carlo tunes
Results on the Drell-Yan process cross section and of the angular correlations in Drell-Yan lepton pairs via the φη∗ variable, at 7 TeV have been measured and compared with different theoretical expectation from several Monte Carlo generators and parton density functions (PDF) sets

Summary

Marco MUSICH

The study of W ± and Z1 vector bosons production in proton-proton collisions at the LHC represents an important test of perturbative QCD calculations, and can be used to constrain the parton density functions (PDF) of the proton. The inclusive vector boson cross section has been previous√ly measured by ATLAS and CMS at a center-of-mass energy of 7 TeV [3, 4]. The final results are compared to the theoretical NNLO FEWZ [6] predictions with a MSTW2008 [7] PDF set, for muons and electrons final state, and for the dilepton combination (Fig.). The final results are compared to the theoretical NNLO FEWZ [6] predictions with a MSTW2008 [7] PDF set, for muons and electrons final state, and for the dilepton combination (Fig.1) These measurements are consistent between the different channels, and in agreement with NNLO cross section calculations. The ATLAS measured cross section at dressed level shows (Fig. right) that NLO QCD predictions are not completely satisfactory in describing the data

Total uncertainty

ALPGEN SHERPA

CMS Preliminary Total Uncertainty Statistical Uncertainty

Conclusions