Oct 2017 - Sep 2018
# Precision EW Measurements from ATLAS - Towards Extracting sin^2 theta_eff

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by

→
Europe/London

Description

The phenomenal operation of the LHC in Run-1 has allowed high

precision measurements to be attained for single vector boson

production in pp collisions. A new measurement of the cross section

for Z\gamma production at \sqrt{s}=8 TeV will be presented triple

differentially in dilepton invariant mass, |y| and \cos\theta covering

the region 46<m<200 GeV; 0<|y|<3.6; and -1<cos\theta<+1. The

measurement is designed to be simultaneously sensitive to the proton

PDFs and to the weak mixing angle. A precision of better than 0.5% in

the region m~mZ (excluding luminosity uncertainty) is achieved. An

unfolded measurement of the Z forward-backward asymmetry is presented,

and a novel method of extracting the effective weak mixing angle using

this data will be discussed, together with plans from ATLAS to test

the consistency of the EW sector of the Standard Model.