August 27, 2017 to September 1, 2017
Other Institutes
Europe/Zurich timezone

Precision measurements of electroweak observables with the ATLAS Detector

Aug 28, 2017, 5:00 PM
30m
F3-4

F3-4

Hard QCD and EW Hard QCD and EW

Speaker

Camilla Vittori (Universita e INFN, Bologna (IT))

Description

Measurements of the Drell-Yan production of W and Z/gamma bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration measured the di-lepton mass range up to the TeV scale as well as the triple differential cross-section measurement as a function of Mll, dilepton rapidity and cosθ defined in the Collins-Soper frame. This measurement provides sensitivity to the PDFs and the weak mixing angle. The latest results of the ATLAS collaboration will be presented.

A second important observable in the electroweak sector is the W boson mass in order to test the overall consistency of the Standard Model. Since the discovery of a Higgs Boson, the the W boson mass is predicted to 7 MeV precision, while the world average of all measurements is 15 MeV, making the improved measurement an important goal. Large samples of leptonic decays of W and Z bosons were collected with efficient single lepton triggers in the 7 TeV data set corresponding to an integrated luminosity of 4.6/fb. With these samples the detector and physics modelling has been studied in great detail and enabled a W boson mass measurement with a precision of 19 MeV, which will be presented in this talk.

Primary author

Yoram Rozen (Technion (IL))

Presentation materials